CN100561604C - The multi-layer wiring board of low-temperature co-burning ceramic material and this material of use - Google Patents

The multi-layer wiring board of low-temperature co-burning ceramic material and this material of use Download PDF

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CN100561604C
CN100561604C CN 200510080911 CN200510080911A CN100561604C CN 100561604 C CN100561604 C CN 100561604C CN 200510080911 CN200510080911 CN 200510080911 CN 200510080911 A CN200510080911 A CN 200510080911A CN 100561604 C CN100561604 C CN 100561604C
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glass
temperature
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mixed layer
ceramic material
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CN1716459A (en
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宫内泰治
岚友宏
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TDK Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
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Abstract

The purpose of this invention is to provide the low-temperature co-burning ceramic material that has controlled thermal linear expansion coefficient and have high-k, even and also can reduce its warpage when in firing the stacked multi-layer wiring board of the different therein glass-ceramic mixed layers of forming of product, having asymmetric stepped construction.Low-temperature co-burning ceramic material according to the present invention comprises: based on SiO 2-B 2O 3-Al 2O 3The glass of-alkaline earth oxide, aluminium oxide, titanium oxide and cordierite; Glass, titanium oxide and cordierite; Perhaps glass, titanium oxide and mullite.When multi-layer wiring board is made by this low-temperature co-burning ceramic material, regulate the content of cordierite in the baseplate material or mullite, be controlled to be with thermal linear expansion coefficient difference and be not more than 0.25 * 10 the interlayer in the baseplate material -6/ ℃.

Description

The multi-layer wiring board of low-temperature co-burning ceramic material and this material of use
Technical field
The present invention relates to comprise the glass-ceramic substance of glass composition and ceramic constituents, i.e. the multi-layer wiring board of low-temperature co-burning ceramic material and this material of use.
Background technology
Be used for the insulation distributing board of semiconductor chip, disclose and the relevant technology of glass-ceramic substance (LTCC (ltcc substrate)), this substrate can be fired not being higher than under 1000 ℃ the low temperature, to fire (referring to for example Japanese patent application 1-132194 and Japanese patent application 5-211006) simultaneously with conductor material and resistance material.This substrate is produced in the following manner to constitute multi-layer wiring board: at first, form raw cook (green sheet); On the raw cook surface, use conductor material and resistance material printed, conductive line; Stacked and suppress raw cook after a plurality of printings, with the cambium layer laminate materials; Fire this stacking material then.This substrate is used as the LTCC module, for example high-frequency laminating module, antenna modular converter and filtering module.
In order to make the purpose of multi-layer wiring board, for example, the ceramic composite (referring to for example Japanese patent application 2004-83373) that will be used to glass-ceramic substance is disclosed, it is the ceramic composite of high thermal expansion, it comprises glass, filler and cordierite, glass comprises SrO, and filler comprises that thermal linear expansion coefficient is 6 * 10 in 40 to 400 ℃ scope -6/ ℃ or bigger metal oxide.Here, Japanese patent application 2004-83373 is described to, and preferably uses for example quartzy, forsterite or enstatite as metal oxide.In this manner, the main purpose of Japanese patent application 2004-83373 provides this low-firing porcelain with high thermal expansion and low-k, and it is to have 8 * 10 -6/ ℃ to 15 * 10 -6The high thermal expansion of/℃ thermal linear expansion coefficient and have under 1MHz porcelain less than the low-k of 7 dielectric constant.
Summary of the invention
(problem to be solved)
In recent years, in order to enhance productivity, under many circumstances, fire, to go out a plurality of products by a substrate production with the form of common substrate (collective substrate).At this moment, in order to keep, more and more higher to the requirement of common substrate flatness from the accuracy of the product of this common substrate production.
Simultaneously, for the packaging density that increases the LTCC module and reduce its size, the expectation multi-layer wiring board not only forms by stacked glass-ceramic mixed layer with identical dielectric constant, also forms by stacked glass-ceramic mixed layer with differing dielectric constant.
But, when multi-layer wiring board has different the composition when forming with the glass-ceramic mixed layer that produces differing dielectric constant by stacked, following problem will occur, promptly fire product meeting warpage, have different thermal linear expansion coefficients because have the different glass-ceramic mixed layers of forming.
In order to solve the problem of firing the product warpage,,, thereby prevent to fire the product warpage with the difference of thermal linear expansion coefficient between the counteracting raw cook with the stacked raw cook of the symmetrical structure on stacked direction.But, in order to improve the flexibility ratio in the substrate design and to respond user's request neatly,, expectation do not form with symmetrical structure even firing product, and the warpage of firing product is also very little.
Therefore, first purpose of the present invention provides to have and is controlled at the interior thermal linear expansion coefficient of preset range and the low-temperature co-burning ceramic material of high-k, that is, by in multi-layer wiring board, inserting thickness and the size that the capacitor layer with high power capacity reduces module.In addition, even second purpose of the present invention is to fire product not have symmetrical structure in multi-layer wiring board, also can reduce its warpage, thereby improve the flexibility ratio in the substrate design, wherein in multi-layer wiring board, be laminated with glass-ceramic mixed layers with different compositions.
The inventor finds, by in material, adding cordierite or mullite as filler, and, just can easily control the thermal linear expansion coefficient of low-temperature co-burning ceramic material, and finish the present invention by increasing or reduce the content of cordierite or mullite.
That is, according to low-temperature co-burning ceramic material of the present invention, it is characterized in that comprising: the glass of 60～78% volume ratios, this glass consists of the SiO of 46～60% mass ratioes 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, the alkaline earth oxide of at least 60% mass ratio is SrO; Greater than 0 to the aluminium oxide that is not more than 16% volume ratio; The titanium oxide of 10～26% volume ratios; And the cordierite of 2～15% volume ratios.Hereinafter be called low-temperature co-burning ceramic material (I).By adding titanium oxide and aluminium oxide and adding cordierite simultaneously, might keep high-k, and may easily control thermal linear expansion coefficient according to content of cordierite as filler.
In addition, according to low-temperature co-burning ceramic material of the present invention, it is characterized in that comprising: the glass of 60～78% volume ratios, this glass consists of the SiO of 46～60% mass ratioes 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, the alkaline earth oxide of at least 60% mass ratio is SrO; The titanium oxide of 14～27% volume ratios; And the cordierite of 5～15.5% volume ratios.Hereinafter be called low-temperature co-burning ceramic material (II).By adding titanium oxide and adding cordierite simultaneously, might keep high-k, and may easily control thermal linear expansion coefficient according to content of cordierite as filler.
In addition, according to low-temperature co-burning ceramic material of the present invention, it is characterized in that comprising: be no less than 60% to the glass less than 66% volume ratio, this glass consists of the SiO of 46～60% mass ratioes 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, the alkaline earth oxide of at least 60% mass ratio is SrO; Greater than 10% titanium oxide that arrives less than 13% volume ratio; And greater than 22% mullite that arrives less than 30% volume ratio.Hereinafter be called low-temperature co-burning ceramic material (III).By adding titanium oxide and adding mullite simultaneously, might keep high-k, and may easily control thermal linear expansion coefficient according to the content of mullite as filler.
Preferably,, comprise (I), (II) and (III) according to low-temperature co-burning ceramic material of the present invention, have in 50 to 300 ℃ of scopes 5.90 * 10 -6To 6.40 * 10 -6/ ℃ thermal linear expansion coefficient.By making low-temperature co-burning ceramic material have thermal linear expansion coefficient in above-mentioned scope, can have thermal linear expansion coefficient with traditional low-temperature co-burning ceramic material par according to low-temperature co-burning ceramic material of the present invention.
Preferably,, comprise (I), (II) and (III) according to low-temperature co-burning ceramic material of the present invention, at room temperature under the frequency of 1.9GHz, have and be not less than 10 dielectric constant.Be not less than 10 dielectric constant by low-temperature co-burning ceramic material is had, may have the capacitor of high power capacity in conjunction with traditional low-temperature co-burning ceramic material manufacturing with low-k.
According to multi-layer wiring board of the present invention, it is characterized in that, therein in the multi-layer wiring board of the stacked type of glass-ceramic mixed layer, one deck at least in the glass-ceramic mixed layer is by comprising that the low-temperature co-burning ceramic material of forming below makes: the glass of 60-78% volume ratio, this glass consists of the SiO of 46～60% mass ratioes 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, the alkaline earth oxide of at least 60% mass ratio is SrO; Greater than 0 to the aluminium oxide that is not more than 16% volume ratio; The titanium oxide of 10～26% volume ratios; And the cordierite of 2～15% volume ratios.
According to multi-layer wiring board of the present invention, it is characterized in that, therein in the multi-layer wiring board of the stacked type of glass-ceramic mixed layer, one deck at least in the glass-ceramic mixed layer is by comprising that the low-temperature co-burning ceramic material of forming below makes: the glass of 60-78% volume ratio, this glass consists of the SiO of 46～60% mass ratioes 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, the alkaline earth oxide of at least 60% mass ratio is SrO; The titanium oxide of 14～27% volume ratios; And the cordierite of 5～15.5% volume ratios.
According to multi-layer wiring board of the present invention, it is characterized in that, therein in the stacked multi-layer wiring board of glass-ceramic mixed layer, one deck at least in the glass-ceramic mixed layer is by comprising that the low-temperature co-burning ceramic material of forming below makes: be no less than 60% to the glass less than 66% volume ratio, this glass consists of the SiO of 46～60% mass ratioes 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, the alkaline earth oxide of at least 60% mass ratio is SrO; Greater than 10% titanium oxide that arrives less than 13% volume ratio; And greater than 22% mullite that arrives less than 30% volume ratio.
Preferably, in multi-layer wiring board according to the present invention, comprise (I), (II) and low-temperature co-burning ceramic material (III) have in 50 to 300 ℃ scope 5.90 * 10 -6To 6.40 * 10 -6/ ℃ thermal linear expansion coefficient, at room temperature under the frequency of 1.9GHz, have and be not less than 10 dielectric constant.In low-temperature co-burning ceramic material according to the present invention, thermal linear expansion coefficient can be controlled in 5.90 * 10 -6To 6.40 * 10 -6/ ℃ scope in, have the dielectric constant that remains on high value simultaneously.Therefore, for example,, thermal linear expansion coefficient may be controlled in the preset range, and reduce the warpage of substrate when by this low-temperature co-burning ceramic material and the low-temperature co-burning ceramic material with low-k being made up when making multi-layer wiring board.
Preferably, in multi-layer wiring board according to the present invention, in 50 to 300 ℃ scope, be not more than 0.25 * 10 by the thermal linear expansion coefficient difference between low-temperature co-burning ceramic material (I), (II) or the glass-ceramic mixed layer of (III) making and other glass-ceramic mixed layer except that this glass-ceramic mixed layer -6/ ℃.By the thermal linear expansion coefficient difference is controlled in this scope, may reduce the warpage of substrate.
Preferably, in multi-layer wiring board according to the present invention, except at room temperature under the frequency of 1.9GHz, have the dielectric constant of 5-8 by other glass-ceramic mixed layer low-temperature co-burning ceramic material (I), (II) or this glass-ceramic mixed layer of (III) making.Stacked by the glass-ceramic mixed layer that will have differing dielectric constant, can increase the packaging density of LTCC module and reduce its size.
Preferably, in multi-layer wiring board according to the present invention, except by other glass-ceramic mixed layer low-temperature co-burning ceramic material (I), (II) or this glass-ceramic mixed layer of (III) making by comprising what the following low-temperature co-burning ceramic material of forming was made: the glass of 58～76% volume ratios, this glass consists of the SiO of 46～60% mass ratioes 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, the alkaline earth oxide of at least 60% mass ratio is SrO; And the aluminium oxide of 24～42% volume ratios.
In multi-layer wiring board according to the present invention, poor by the thermal linear expansion coefficient that reduces between the glass-ceramic mixed layer, the generation Be Controlled of warpage, and warpage comprises the situation that is not more than 200 μ m for 50 millimeters foursquare size warpages.And warpage also comprises the situation that is not more than 200 μ m for 100 millimeters foursquare size warpages.By making warpage be not more than above-mentioned value, electronic unit is installed in possible pinpoint accuracy ground on the surface of multi-layer wiring board.
(invention effect)
According to the present invention, by adding cordierite or mullite are used to control low-temperature co-burning ceramic material as filler thermal linear expansion coefficient, may prevent that low-temperature co-burning ceramic material from becoming high expansion porcelain, and may make low-temperature co-burning ceramic material have high-k.In addition, the present invention can reduce to fire the warpage of product, even stepped construction is not that symmetrical structure also can be like this in having the stacked multi-layer wiring board of the different glass-ceramic mixed layers of forming.Like this, the capacitor layer with high power capacity can be inserted in the multi-layer wiring board.The result is, may reduce the thickness and the size of module, may increase the flexibility ratio in the substrate design simultaneously.
Description of drawings
Fig. 1 is the schematic section of multi-layer wiring board.Figure 1A to the laminated construction shown in the 1J be when have the different glass-ceramic mixed layers of forming with unsymmetric structure the instantiation when stacked.Fig. 1 K to the laminated construction shown in Fig. 1 O be when have the different glass-ceramic mixed layers of forming with symmetrical structure the instantiation when stacked;
Fig. 2 shows the schematic diagram of the position when measuring the substrate warp amount;
Fig. 3 shows as 0.72 glass+0.14TiO 2+ (0.14-x) Al 2O 3+ xMg 2Al 4Si 5O 18Composition formula in the figure of x variation of thermal linear expansion coefficient when changing;
Fig. 4 shows as 0.72 glass+0.14TiO 2+ (0.14-x) Al 2O 3+ xMg 2Al 4Si 5O 18Composition formula in the figure of x variation of dielectric constant when changing;
Fig. 5 shows as the TiO of 0.60 glass+(0.39-x) 2+ 0.01Al 2O 3+ xMg 2Al 4Si 5O 18Composition formula in the figure of x variation of thermal linear expansion coefficient when changing;
Fig. 6 shows as the TiO of 0.60 glass+(0.39-x) 2+ 0.01Al 2O 3+ xMg 2Al 4Si 5O 18Composition formula in the figure of x variation of dielectric constant when changing;
Fig. 7 shows the figure of the stepped construction and the relation between the substrate warp of multilager base plate;
Fig. 8 shows as the TiO of 0.60 glass+(0.40-x) 2+ xMg 2Al 4Si 5O 18Composition formula in the figure of x variation of thermal linear expansion coefficient when changing;
Fig. 9 shows as the TiO of 0.60 glass+(0.40-x) 2+ xMg 2Al 4Si 5O 18Composition formula in the figure of x variation of dielectric constant when changing;
Figure 10 shows as the TiO of 0.78 glass+(0.22-x) 2+ xMg 2Al 4Si 5O 18Composition formula in the figure of x variation of thermal linear expansion coefficient when changing;
Figure 11 shows as the TiO of 0.78 glass+(0.22-x) 2+ xMg 2Al 4Si 5O 18Composition formula in the figure of x variation of dielectric constant when changing;
Figure 12 shows as (0.88-x) glass+0.12TiO 2+ xAl 6Si 2O 13Composition formula in the figure of x variation of thermal linear expansion coefficient when changing;
Figure 13 shows as (0.88-x) glass+0.12TiO 2+ xAl 6Si 2O 13Composition formula in the figure of x variation of dielectric constant when changing;
Figure 14 shows as the TiO of 0.60 glass+(0.40-x) 2+ xAl 6Si 2O 13Composition formula in the figure of x variation of thermal linear expansion coefficient when changing; And
Figure 15 shows as the TiO of 0.60 glass+(0.40-x) 2+ xAl 6Si 2O 13Composition formula in the figure of x variation of dielectric constant when changing.
Embodiment
Below, will describe the present invention in detail by the preferred embodiments of the invention are shown, but be not intended to limit the invention to these descriptions.
(first embodiment)
Low-temperature co-burning ceramic material according to first embodiment comprises: the glass composition of 60～78% volume ratios and the ceramic constituents of 40～22% volume ratios, promptly ceramic constituents comprises aluminium oxide (Al 2O 3), titanium oxide (TiO 2) and cordierite (Mg 2Al 4Si 5O 18).That is, this low-temperature co-burning ceramic material is low-temperature co-burning ceramic material (I).
Here, glass need have following composition: 46～60%, the SiO of preferred 47～55% mass ratioes 20.5 the B of preferred 1～4% mass ratio～5%, 2 O 36～17.5%, the Al of preferred 7～16.5% mass ratioes 2O 3And 25～45%, the alkaline earth oxide of preferred 30～40% mass ratioes.As this SiO 2Be less than 46% quality than the time, it is very difficult that vitrifying becomes, and work as SiO 2More than 60% quality than the time, it is too high that glass softening point becomes, and makes glass sintering at low temperatures.In addition, work as B 2O 3More than 5% quality than the time, the moisture resistance step-down behind the sintering, and work as B 2O 3Be less than 0.5% quality than the time, it is slightly high that vitrification point becomes, and sintering temperature becomes too high, this does not expect.In addition, work as Al 2O 3Be less than 6% quality than the time, the intensity step-down of glass composition, and work as Al 2O 3More than 17.5% quality than the time, vitrifying become the difficulty.Alkaline earth oxide in this glass composition comprises MgO, CaO, BaO and SrO, and at least 60% mass ratio of alkaline earth oxide total amount, preferably to be no less than 80% mass ratio need be SrO.When the amount of SrO be less than 60% quality than the time, glass transition temperature uprises, so the low-firing difficulty.Add a spot of other CaO, MgO and BaO by combination, the viscosity of melten glass can reduce, and sintering range can be expanded greatly so that makes, so preferably is used in combination these alkaline earth oxides.With regard to additive effect, preferably add 1% mass ratio or more alkaline earth oxide CaO, MgO and BaO altogether, more preferably add CaO and the MgO that is no less than 0.2% mass ratio respectively, particularly preferably be and add CaO and the MgO that is no less than 0.5% mass ratio respectively.Make preferably that the amount of CaO is less than 10% mass ratio in the alkaline earth oxide, and make no more than 6% mass ratio of the amount of MgO in the alkaline earth oxide.When the amount of these oxides during, can not obtain high strength china, and the degree of crystallization of glass is difficult to control greater than above-mentioned amount.
According to the low-temperature co-burning ceramic material (I) of first embodiment need comprise 60～78%, the glass composition of preferred 60～73% volume ratios.When the glass composition is less than 60% volume ratio, when promptly ceramic constituents is more than 40% volume ratio, can not be at 1000 ℃ or the lower sintered body that obtains densification.On the other hand, when glass composition during more than 78% volume ratio, when promptly ceramic constituents was less than 22% volume ratio, bending strength reduced.
The content of the aluminium oxide of one of ceramic constituents from more than 0% volume ratio to no more than 16% volume ratio, be preferably 1～8% volume ratio.When adding aluminium oxide and regulate dielectric constant, when the aluminium oxide that adds more than 16% volume ratio, can not obtain the target dielectric constant.
The content of the titanium oxide of one of ceramic constituents is 10～26% volume ratios, is preferably 14～25% volume ratios.When the interpolation titanium oxide increases dielectric constant, when interpolation is less than the titanium oxide of 10% volume ratio, the dielectric constant step-down.On the other hand, when the titanium oxide that adds more than 26% volume ratio, the thermal linear expansion coefficient of low-temperature co-burning ceramic material (I) becomes excessive.
The content of cordierite of one of ceramic constituents is 2～15% volume ratios, is preferably 6～14% volume ratios.Cordierite has hanging down to 1.8 * 10 in 50 to 300 ℃ of scopes -6/ ℃ thermal linear expansion coefficient, and have low to 4.8 dielectric constant.Therefore, by changing content of cordierite in the low-temperature co-burning ceramic material (I), may reduce thermal linear expansion coefficient and dielectric constant is not had big influence.When content of cordierite was less than 2% volume ratio, it is big that the thermal linear expansion coefficient of low-temperature co-burning ceramic material (I) becomes.On the other hand, when content of cordierite during more than 15% volume ratio, the thermal linear expansion coefficient of low-temperature co-burning ceramic material (I) becomes too small.
What recommend is, by regulating each composition, according to the low-temperature co-burning ceramic material (I) of first embodiment should be made with in 50 to 300 ℃ scope 5.90 * 10 -6To 6.40 * 10 -6/ ℃ thermal linear expansion coefficient, and at room temperature under the 1.9GHz frequency, have and be not less than 10 dielectric constant.Particularly, the control of thermal linear expansion coefficient is undertaken by regulating content of cordierite.The low-temperature co-burning ceramic material that has the thermal linear expansion coefficient that is prevented from uprising and have high-k can be provided.
Low-temperature co-burning ceramic material (I) according to first embodiment can comprise other composition, as long as the interpolation of these other compositions is without prejudice to purpose of the present invention.
Next, will be used for the situation of multi-layer wiring board according to the low-temperature co-burning ceramic material (I) of first embodiment with describing.According to the multi-layer wiring board of first embodiment be wherein stacked and at least one layer wherein glass-ceramic mixed layer of glass-ceramic mixed layer by the multi-layer wiring board that comprises that the following low-temperature co-burning ceramic material of forming forms: the glass of 60～78% volume ratios, this glass consists of the SiO of 46～60% mass ratioes 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, the alkaline earth oxide of at least 60% mass ratio is SrO; Greater than 0 to the aluminium oxide that is not more than 16% volume ratio; The titanium oxide of 10～26% volume ratios; And the cordierite of 2～15% volume ratios.In addition, the expectation low-temperature co-burning ceramic material (I) have in 50 to 300 ℃ of scopes 5.90 * 10 -6To 6.40 * 10 -6/ ℃ thermal linear expansion coefficient, and at room temperature under the 1.9GHz frequency, have and be not less than 10 dielectric constant.
Also recommendation is, only stacked by the glass-ceramic mixed layer of making according to the low-temperature co-burning ceramic material (I) of first embodiment, forms multi-layer wiring board.But, as shown in Figure 1, in the first embodiment, also may be by formation at least one layer according to the glass-ceramic mixed layer of the low-temperature co-burning ceramic material (I) of first embodiment, and stacked form the glass-ceramic mixed layer that forms thereon by difference, form multi-layer wiring board.In Fig. 1, show the schematic section of multi-layer wiring board.Figure 1A be the glass-ceramic mixed layer wherein made by low-temperature co-burning ceramic material (I) to 1E and Fig. 1 F to the laminated construction shown in the 1J with by the different instantiations of forming the glass-ceramic mixed layer made with the stacked situation of unsymmetric structure.Fig. 1 K be the glass-ceramic mixed layer wherein made by low-temperature co-burning ceramic material (I) to the stepped construction shown in the 1O with by the different instantiations of forming the glass-ceramic mixed layer made with the stacked situation of symmetrical structure.Figure 1 illustrates wherein two kinds of different stacked situations of producing multi-layer wiring board of glass-ceramic mixed layer of forming.For example, formed by the low-temperature co-burning ceramic material (I) according to first embodiment by the glass-ceramic mixed layer shown in the shadow region, the glass-ceramic mixed layer that is illustrated by white portion (shadeless) is formed by other low-temperature co-burning ceramic material.Here, multi-layer wiring board can be formed by three kinds or more kinds of different types of glass-ceramic mixed layer of forming.
Preferably, the low-temperature co-burning ceramic material (I) according to first embodiment has following physical property: in 50 to 300 ℃ of scopes 5.90 * 10 -4To 6.40 * 10 -6/ ℃ thermal linear expansion coefficient, and the dielectric constant that at room temperature under the 1.9GHz frequency, is not less than 10.But, when combining when forming distributing board with form the glass-ceramic mixed layer of making by other, be not more than 0.25 * 10 by making the thermal linear expansion coefficient difference in 50 to 300 ℃ of scopes between the glass-ceramic mixed layer by the glass-ceramic mixed layer of making according to the low-temperature co-burning ceramic material (I) of first embodiment -6/ ℃, the warpage of multi-layer wiring board can Be Controlled.Warpage is illustrated by the W among Fig. 2.By making the thermal linear expansion coefficient difference between the glass-ceramic mixed layer be not more than 0.25 * 10 -6/ ℃, can make the warpage W of multi-layer wiring board be not more than 200 μ m for 50 millimeters foursquare sizes, perhaps be not more than 200 μ m for 100 millimeters foursquare sizes.At this moment, suppose that the length on substrate one side (when long limit and minor face, being long limit) is t, can make the warpage rate that calculates by W/t be not more than 0.4%, preferably be not more than 0.2%.By making the warpage rate be not more than above-mentioned value, can on the surface of multi-layer wiring board, electronic unit be installed to pinpoint accuracy.
Thermal linear expansion coefficient difference between the glass-ceramic mixed layer is greater than 0.25 * 10 -6/ ℃ the time, in order to reduce warpage, the glass-ceramic mixed layer need be aligned to the center symmetry with respect to stacked direction, as Fig. 1 K to shown in the 1O.But, in multi-layer wiring board,, can make the thermal linear expansion coefficient difference be not more than 0.25 * 10 by the control content of cordierite according to first embodiment -6/ ℃, even make the glass-ceramic mixed layer as Figure 1A to stacked shown in the 1J with unsymmetric structure, also can make warpage very little.
In addition, if making by the dielectric constant except other glass-ceramic mixed layer of making according to the material the low-temperature co-burning ceramic material (I) of first embodiment is 5 to 8 for the frequency of 1.9GHz at room temperature, the difference of dielectric constant just can be at least 2 or bigger so, thereby can further increase the flexibility ratio when designing substrate.
For example, can select the glass-ceramic mixed layer made by the low-temperature co-burning ceramic material of describing among the Japanese patent application 1-132194 as by other glass-ceramic mixed layer except making according to the material the low-temperature co-burning ceramic material (I) of first embodiment. the low-temperature co-burning ceramic material of in Japanese patent application 1-132194, describing have in 50 to 300 ℃ of scopes 5.90 * 10 -6To 6.40 * 10 -6Thermal linear expansion coefficient in the/℃ scope, and 5 to 8 dielectric constant under the 1.9GHz frequency at room temperature.Therefore, the low-temperature co-burning ceramic material of describing in Japanese patent application 1-132194 is suitable for combining with low-temperature co-burning ceramic material (I) according to first embodiment and forms multi-layer wiring board.The low-temperature co-burning ceramic material of describing in Japanese patent application 1-132194 comprises: the glass of 58～76% volume ratios, the SiO that consists of 46～60% mass ratioes of this glass 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, the alkaline earth oxide of at least 60% mass ratio is SrO; And the aluminium oxide as filler of 24～42% volume ratios.Because if the glass composition is less than 58%, promptly ceramic constituents is more than 42% volume ratio, so can not 1000 ℃ or more low temperature obtain fine and close sintered body.On the other hand, if the glass composition more than 76% volume ratio, promptly ceramic constituents is less than 24% volume ratio, bending strength reduces so.
When other glass-ceramic mixed layer be the low-temperature co-burning ceramic material described in by Japanese patent application 1-132194 make the glass-ceramic mixed layer time, for the coefficient of thermal expansion differences in 50 to 300 ℃ of scopes that makes interlayer is not more than 0.25 * 10 -6/ ℃, and make the dielectric constant difference of interlayer be not less than 2, make that the content of the aluminium oxide of one of ceramic constituents is 1～8% volume ratio, is preferably 4～8% volume ratios in by the glass-ceramic mixed layer of making according to the low-temperature co-burning ceramic material (I) of first embodiment.In addition, make the content of titanium oxide of one of ceramic constituents be preferably 14～25% volume ratios, more preferably 14～16% volume ratios.In addition, make the content of cordierite of one of ceramic constituents be preferably 6～14% volume ratios, more preferably 6～7% volume ratios.In addition, make the content of glass composition be preferably 60～73% volume ratios, more preferably 72～73% volume ratios.Here, the SiO that consists of 47～55% mass ratioes of glass preferably 2, 1～3% mass ratio B 2O 3, 7～16.5% mass ratioes Al 2O 3And the alkaline earth oxide of 30～40% mass ratioes.
Except by at least one or a plurality of layer in other glass-ceramic mixed layer the glass-ceramic mixed layer of making according to the low-temperature co-burning ceramic material (I) of first embodiment, form by the low-temperature co-burning ceramic material of describing among the Japanese patent application 1-132194 for example relevant with distributing board.Preferably, all other glass-ceramic mixed layer is all formed by the low-temperature co-burning ceramic material of describing among the Japanese patent application 1-132194 relevant with distributing board.
In order to make multi-layer wiring board according to first embodiment, for example, the raw material of above-mentioned ceramic constituents and glass composition are made the powder that average particulate diameter is not more than 10 μ m, is preferably 1 to 4 μ m, then raw material powder is mixed with each other, and on demand water or solvent and suitable bonding is added in the raw material powder of mixing and prepare pastel.Next, use The tape casting or extruder that this pastel is formed about 0.1 to 1.0mm sheet, produce ceramic green sheet.A plurality of ceramic green sheets are stacked and suppress under 40 to 120 ℃ heated condition, with the cambium layer laminate materials.At 800 to 1000 ℃ of these stacking materials of following sintering, produce multilager base plate simultaneously.What also recommend in addition, is: the powder-mixed material of the various compositions of dry-pressing is to form sheet; Then, a plurality of stacked compactings then with the cambium layer laminate materials; And sinter layer laminate materials.At this moment, what also recommend is to provide conductor, resistor, external coating, thermistor, then by the while sintering, to form multi-layer wiring board.
(second embodiment)
Low-temperature co-burning ceramic material according to second embodiment comprises: the glass composition of 60～78% volume ratios and the ceramic constituents of 22～40% volume ratios, promptly ceramic constituents comprises titanium oxide (TiO 2) and cordierite (Mg 2Al 4Si 5O 18).That is, this low-temperature co-burning ceramic material is low-temperature co-burning ceramic material (II).
Here, use with the first embodiment situation in identical glass as glass.
Preferably include the glass composition of 60～78% volume ratios according to the low-temperature co-burning ceramic material (II) of second embodiment.When the glass composition is less than 60% volume ratio, when promptly ceramic constituents is more than 40% volume ratio, can not under 1000 ℃, obtain fine and close sintered body.On the other hand, when glass composition during more than 78% volume ratio, when promptly ceramic constituents was less than 22% volume ratio, bending strength reduced.
Preferably, the content of the titanium oxide of one of ceramic constituents is 14～27% volume ratios.When the interpolation titanium oxide increases dielectric constant, when interpolation is less than the titanium oxide of 14% volume ratio, the dielectric constant step-down.On the other hand, when the titanium oxide that adds more than 27% volume ratio, the thermal linear expansion coefficient of low-temperature co-burning ceramic material (II) becomes excessive.
Preferably, the content of cordierite of one of ceramic constituents is 5～15.5% volume ratios.Cordierite has hanging down to 1.8 * 10 in 50 to 300 ℃ of scopes -6/ ℃ thermal linear expansion coefficient, and have low to 4.8 dielectric constant.Therefore, by changing content of cordierite in the low-temperature co-burning ceramic material (II), may reduce thermal linear expansion coefficient and dielectric constant is not had big influence.When content of cordierite was less than 5% volume ratio, it is big that the thermal linear expansion coefficient of low-temperature co-burning ceramic material (II) becomes.On the other hand, when content of cordierite during more than 15.5% volume ratio, the thermal linear expansion coefficient of low-temperature co-burning ceramic material (II) becomes too small.
What recommend is, by regulating each composition, according to the low-temperature co-burning ceramic material (II) of second embodiment should be made with in 50 to 300 ℃ of scopes 5.90 * 10 -6To 6.40 * 10 -6/ ℃ thermal linear expansion coefficient, and at room temperature under the 1.9GHz frequency, have and be not less than 10 dielectric constant.Particularly, the control of thermal linear expansion coefficient is undertaken by regulating content of cordierite.The low-temperature co-burning ceramic material that has the thermal linear expansion coefficient that is prevented from becoming too high and have high-k can be provided.
Low-temperature co-burning ceramic material (II) according to second embodiment can comprise other composition, as long as the interpolation of these other compositions is without prejudice to purpose of the present invention.
Next, will be used for the situation of multi-layer wiring board according to the low-temperature co-burning ceramic material (II) of second embodiment with describing.According to the multi-layer wiring board of second embodiment be wherein stacked and at least one layer wherein glass-ceramic mixed layer of glass-ceramic mixed layer by the multi-layer wiring board that comprises that the following low-temperature co-burning ceramic material of forming forms: the glass composition of 60～78% volume ratios, the SiO that consists of 46～60% mass ratioes of this glass 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, the alkaline earth oxide of at least 60% mass ratio is SrO; The titanium oxide of 14～27% volume ratios; And the cordierite of 5～15.5% volume ratios.In addition, preferably, this low-temperature co-burning ceramic material have in 50 to 300 ℃ of scopes 5.90 * 10 -6To 6.40 * 10 -6/ ℃ thermal linear expansion coefficient, and at room temperature under the 1.9GHz frequency, have and be not less than 10 dielectric constant.
Also recommendation is, only stacked by the glass-ceramic mixed layer of making according to the low-temperature co-burning ceramic material (II) of second embodiment, forms multi-layer wiring board.But, as the situation in first embodiment, as shown in Figure 1, in second embodiment, also may be by form at least one layer of glass-ceramic mixed layer by low-temperature co-burning ceramic material (II) according to second embodiment, and stacked form the glass-ceramic mixed layer that forms thereon by difference, form multi-layer wiring board.In Fig. 1, show by stacked and different form the multi-layer wiring board that the glass-ceramic mixed layer made forms by two kinds.For example, what recommend is, formed by the low-temperature co-burning ceramic material (II) according to second embodiment by the glass-ceramic mixed layer shown in the shadow region, the glass-ceramic mixed layer that is illustrated by white portion (shadeless) is formed by other low-temperature co-burning ceramic material.Here, multi-layer wiring board can be formed by the glass-ceramic mixed layer that three kinds or more kinds of variety classes are formed.
Preferably, the low-temperature co-burning ceramic material (II) according to second embodiment has following physical property: in 50 to 300 ℃ of scopes 5.90 * 10 -6To 6.40 * 10 -6/ ℃ thermal linear expansion coefficient, and the dielectric constant that at room temperature under the 1.9GHz frequency, is not less than 10.But, when being combined when forming multi-layer wiring board be made of the glass-ceramic mixed layer of making other by the glass-ceramic mixed layer of making according to the low-temperature co-burning ceramic material of second embodiment, the thermal linear expansion coefficient difference in 50 to 300 ℃ scope is not more than 0.25 * 10 between the glass-ceramic mixed layer by making -6/ ℃, the warpage of multi-layer wiring board can Be Controlled.As the situation in first embodiment, warpage is illustrated by the W among Fig. 2.By making the thermal linear expansion coefficient difference between the glass-ceramic mixed layer be not more than 0.25 * 10 -6/ ℃, can make the warpage W of multi-layer wiring board be not more than 200 μ m for 50 millimeters foursquare sizes, perhaps be not more than 200 μ m for 100 millimeters foursquare sizes.At this moment, suppose that the length on substrate one side (when long limit and minor face, being long limit) is t, can make the warpage rate that calculates by W/t be not more than 0.4%, preferably be not more than 0.2%.By making the warpage rate be not more than above-mentioned value, can on the surface of multi-layer wiring board, electronic unit be installed to pinpoint accuracy.
Thermal linear expansion coefficient difference between the glass-ceramic mixed layer is greater than 0.25 * 10 -6/ ℃ the time, in order to reduce warpage, to the stepped construction shown in the 1O, the glass-ceramic mixed layer need be aligned to the center symmetry with respect to stacked direction as Fig. 1 K.But, in multi-layer wiring board,, can make the thermal linear expansion coefficient difference 0.25 * 10 by the control content of cordierite according to second embodiment -6/ ℃ in, even make the glass-ceramic mixed layer as Figure 1A to stacked shown in the 1J with unsymmetric structure, also can make warpage very little.
In addition, if by the dielectric constant except other glass-ceramic mixed layer of making according to the material the low-temperature co-burning ceramic material (II) of second embodiment at room temperature is 5 to 8 under the 1.9GHz frequency, the dielectric constant difference can be at least 2 or bigger, thereby can further increase the flexibility ratio when designing substrate.
For example, can select the glass-ceramic mixed layer made by the low-temperature co-burning ceramic material of describing among the Japanese patent application 1-132194 as by other glass-ceramic mixed layer except making according to the material the low-temperature co-burning ceramic material (II) of second embodiment.The low-temperature co-burning ceramic material of in Japanese patent application 1-132194, describing have in 50 to 300 ℃ of scopes 5.90 * 10 -6To 6.40 * 10 -6Thermal linear expansion coefficient in the/℃ scope, and 5 to 8 dielectric constant under the 1.9GHz frequency at room temperature.Therefore, the low-temperature co-burning ceramic material of describing in Japanese patent application 1-132194 is suitable for combining with low-temperature co-burning ceramic material (II) according to second embodiment and forms multi-layer wiring board.The low-temperature co-burning ceramic material of describing in Japanese patent application 1-132194 comprises: the glass composition of 58～76% volume ratios, the SiO that consists of 46～60% mass ratioes of this glass 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, the alkaline earth oxide of at least 60% mass ratio is SrO; And the aluminium oxide as filler of 24～42% volume ratios.Because if the glass composition is less than 58%, promptly ceramic constituents is more than 42% volume ratio, so can not 1000 ℃ or more low temperature obtain fine and close sintered body.On the other hand, if the glass composition more than 76% volume ratio, promptly ceramic constituents is less than 24% volume ratio, bending strength reduces so.
When other glass-ceramic mixed layer be the low-temperature co-burning ceramic material described in by Japanese patent application 1-132194 make the glass-ceramic mixed layer time, for the coefficient of thermal expansion differences in 50 to 300 ℃ of scopes that makes interlayer is not more than 0.25 * 10 -6/ ℃, preferably be not more than 0.10 * 10 -6/ ℃, and make the dielectric constant difference of interlayer be not less than 2, make that the content of the titanium oxide of one of ceramic constituents is preferably 14～27% volume ratios, more preferably 15～25% volume ratios in by the glass-ceramic mixed layer of making according to the low-temperature co-burning ceramic material (II) of second embodiment.In addition, make the content of cordierite of one of ceramic constituents be preferably 5～15.5% volume ratios, more preferably 5～13% volume ratios.In addition, make the content of glass composition be preferably 60～78% volume ratios, more preferably 62～78% volume ratios.Here, the SiO that consists of 47～55% mass ratioes of glass 2, 1～3% mass ratio B 2O 3, 7～16.5% mass ratioes Al 2O 3And the alkaline earth oxide of 30～40% mass ratioes.
Except by at least one or a plurality of layer in other glass-ceramic mixed layer the glass-ceramic mixed layer of making according to the low-temperature co-burning ceramic material (II) of second embodiment, form by the low-temperature co-burning ceramic material of describing among the Japanese patent application 1-132194 for example relevant with distributing board.Preferably, all other glass-ceramic mixed layer is all formed by the low-temperature co-burning ceramic material of describing among the Japanese patent application 1-132194 relevant with distributing board.
The manufacture method of describing in the multi-layer wiring board according to first embodiment can be applied to the multi-layer wiring board according to second embodiment under the same conditions.
(the 3rd embodiment)
Low-temperature co-burning ceramic material according to the 3rd embodiment comprises: 60% ceramic constituents to glass composition that is less than 66% volume ratio and 34～40% volume ratios, promptly ceramic constituents comprises titanium oxide (TiO 2) and mullite (Al 6Si 2O 13).That is, this low-temperature co-burning ceramic material is low-temperature co-burning ceramic material (III).
Here, use with the first embodiment situation in identical glass as glass.
Preferably include according to the low-temperature co-burning ceramic material (III) of the 3rd embodiment and to be no less than 60% to the glass composition that is less than 66% volume ratio.When the glass composition is less than 60% volume ratio, when promptly ceramic constituents is more than 40% volume ratio, can not or more obtain fine and close sintered body under the low temperature at 1000 ℃.On the other hand, when glass composition during more than 66% volume ratio, ceramic constituents seldom, so the dielectric constant of low-temperature co-burning ceramic material and thermal linear expansion coefficient become near the dielectric constant and the thermal linear expansion coefficient of glass composition.Therefore, be difficult to satisfy simultaneously required dielectric constant of low-temperature co-burning ceramic material and thermal linear expansion coefficient.
Preferably, the content of the titanium oxide of one of ceramic constituents is less than 13% volume ratio more than 10% volume ratio.When adding titanium oxide and increase dielectric constant, when no more than 10% volume ratio of the content of titanium oxide, the dielectric constant step-down.On the other hand, when interpolation was no less than the titanium oxide of 13% volume ratio, the thermal linear expansion coefficient of low-temperature co-burning ceramic material (III) became excessive.
Preferably, the content of the mullite of one of ceramic constituents is more than 22% volume ratio and is less than 30% volume ratio.Mullite has hanging down to 5.0 * 10 in 50 to 300 ℃ of scopes -6/ ℃ thermal linear expansion coefficient, and have low to 7.4 dielectric constant.Therefore, by changing the content of mullite in the low-temperature co-burning ceramic material (III), may reduce thermal linear expansion coefficient.When no more than 22% volume ratio of the content of mullite, it is big that the thermal linear expansion coefficient of low-temperature co-burning ceramic material (III) becomes. on the other hand, when the content of mullite is no less than 30% volume ratio, the content of glass reduces, therefore material is difficult to sintering, perhaps the content of titanium oxide reduces, and dielectric constant diminishes.
What recommend is, by regulating each composition, according to the low-temperature co-burning ceramic material (III) of the 3rd embodiment have in 50 to 300 ℃ of scopes 5.90 * 10 -6To 6.40 * 10 -6/ ℃ thermal linear expansion coefficient, and at room temperature under the 1.9GHz frequency, have and be not less than 10 dielectric constant.Particularly, the control to thermal linear expansion coefficient is to be undertaken by the content of regulating mullite.The low-temperature co-burning ceramic material that has the thermal linear expansion coefficient that is prevented from uprising and have high-k may be provided.
Low-temperature co-burning ceramic material (III) according to the 3rd embodiment can comprise other composition, as long as the interpolation of these other compositions is without prejudice to purpose of the present invention.
Next, will be used for the situation of multi-layer wiring board according to the low-temperature co-burning ceramic material (III) of the 3rd embodiment with describing.According to the multi-layer wiring board of the 3rd embodiment be wherein stacked and at least one layer wherein glass-ceramic mixed layer of glass-ceramic mixed layer by the multi-layer wiring board that comprises that the following low-temperature co-burning ceramic material of forming forms: be no less than 60% to the glass composition that is less than 66% volume ratio, this glass consists of the SiO of 46～60% mass ratioes 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, the alkaline earth oxide of at least 60% mass ratio is SrO; More than 10% to the titanium oxide that is less than 13% volume ratio; And more than 22% to the mullite that is less than 30% volume ratio.In addition, preferably, low-temperature co-burning ceramic material (III) have in 50 to 300 ℃ of scopes 5.90 * 10 -6To 6.40 * 10 -6/ ℃ thermal linear expansion coefficient, and at room temperature under the 1.9GHz frequency, have and be not less than 10 dielectric constant.
Also recommendation is, only stacked by the glass-ceramic mixed layer of making according to the low-temperature co-burning ceramic material (III) of the 3rd embodiment, forms multi-layer wiring board.But, as the situation in first embodiment, as shown in Figure 1, in the 3rd embodiment, also may be by form at least one layer of glass-ceramic mixed layer by low-temperature co-burning ceramic material (III) according to the 3rd embodiment, and stacked form the glass-ceramic mixed layer that forms thereon by difference, form multi-layer wiring board.In Fig. 1, show by stacked and form the multi-layer wiring board that the glass-ceramic mixed layer made forms by two kinds.For example, also recommendation is, is formed by the low-temperature co-burning ceramic material (III) according to the 3rd embodiment by the glass-ceramic mixed layer shown in the shadow region, is formed by other low-temperature co-burning ceramic material by the glass-ceramic mixed layer shown in the non-hatched area.Here, multi-layer wiring board can be formed by the glass-ceramic mixed layer that three kinds or more kinds of variety classes are formed.
Preferably, the low-temperature co-burning ceramic material (III) according to the 3rd embodiment has following physical property: in 50 to 300 ℃ of scopes 5.90 * 10 -6To 6.40 * 10 -6/ ℃ thermal linear expansion coefficient, and the dielectric constant that at room temperature under the 1.9GHz frequency, is not less than 10.But, when being combined with the glass-ceramic mixed layer of being made up of other by the glass-ceramic mixed layer of making according to the low-temperature co-burning ceramic material (III) of the 3rd embodiment when forming multi-layer wiring board, the thermal linear expansion coefficient difference in 50 to 300 ℃ scope is not more than 0.25 * 10 between the glass-ceramic mixed layer by making -6/ ℃, the warpage of multi-layer wiring board can Be Controlled.As the situation in first embodiment, warpage is illustrated by the W among Fig. 2.By making the thermal linear expansion coefficient difference between the glass-ceramic mixed layer be not more than 0.25 * 10 -6/ ℃, can make the warpage W of multi-layer wiring board be not more than 200 μ m for 50 millimeters foursquare sizes.At this moment, suppose that the length on substrate one side (when long limit and minor face, being long limit) is t, can make the warpage rate that calculates by W/t be not more than 0.4%, preferably be not more than 0.2%.By making the warpage rate be not more than above-mentioned value, can on the surface of multi-layer wiring board, electronic unit be installed to pinpoint accuracy.
Thermal linear expansion coefficient difference between the glass-ceramic mixed layer is greater than 0.25 * 10 -6/ ℃ the time, in order to reduce warpage, to the stepped construction shown in the 1O, the glass-ceramic mixed layer need be aligned to the center symmetry with respect to stacked direction as Fig. 1 K.But in the multi-layer wiring board according to the 3rd embodiment, the content by the control mullite can make the thermal linear expansion coefficient difference 0.25 * 10 -6/ ℃ in, even make the glass-ceramic mixed layer as Figure 1A to 1E and 1F to stacked shown in the 1J with unsymmetric structure, also can make warpage very little.
In addition, if by the dielectric constant except other glass-ceramic mixed layer of making according to the material the low-temperature co-burning ceramic material (III) of the 3rd embodiment at room temperature is 5 to 8 under the 1.9GHz frequency, the dielectric constant difference can be at least 2 or bigger, thereby can further increase the flexibility ratio when designing substrate.
For example, can select the glass-ceramic mixed layer made by the low-temperature co-burning ceramic material of describing among the Japanese patent application 1-132194 as by other glass-ceramic mixed layer except making according to the material the low-temperature co-burning ceramic material (III) of the 3rd embodiment.The low-temperature co-burning ceramic material of in Japanese patent application 1-132194, describing have in 50 to 300 ℃ of scopes 5.90 * 10 -6To 6.40 * 10 -6Thermal linear expansion coefficient in the/℃ scope, and 5 to 8 dielectric constant under the 1.9GHz frequency at room temperature.Therefore, the low-temperature co-burning ceramic material of describing in Japanese patent application 1-132194 is suitable for combining with low-temperature co-burning ceramic material (III) according to the 3rd embodiment and forms multi-layer wiring board.The low-temperature co-burning ceramic material of describing in Japanese patent application 1-132194 comprises: the glass composition of 58～76% volume ratios, this glass consists of the SiO of 46～60% mass ratioes 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, the alkaline earth oxide of at least 60% mass ratio is SrO; And the aluminium oxide as filler of 24～42% volume ratios.Making the glass composition is that the reason of 58～76% volume ratios is as follows: if the glass composition is less than 58% volume ratio, can not obtain fine and close sintered body so, if the glass composition is more than 76% volume ratio, the content of ceramic constituents seldom, therefore, the dielectric constant of low-temperature co-burning ceramic material and thermal linear expansion coefficient become near the dielectric constant of glass composition and thermal linear expansion coefficient, thereby are difficult to satisfy simultaneously required dielectric constant of other glass-ceramic mixed layer and thermal linear expansion coefficient.
When other glass-ceramic mixed layer be the low-temperature co-burning ceramic material described in by Japanese patent application 1-132194 make the glass-ceramic mixed layer time, for the coefficient of thermal expansion differences in 50 to 300 ℃ of scopes that makes interlayer is not more than 0.25 * 10 -6/ ℃, preferably be not more than 0.10 * 10 -6/ ℃, and make the dielectric constant difference of interlayer be not less than 2, make in by the glass-ceramic mixed layer of making according to the low-temperature co-burning ceramic material (III) of the 3rd embodiment, the content of the titanium oxide of one of ceramic constituents is preferably more than 10% to being less than 13% volume ratio, more preferably 11～12% volume ratios.In addition, make the content of mullite of one of ceramic constituents be preferably more than 22% to being less than 30% volume ratio, more preferably 27.5～29.5% volume ratios.In addition, make the content of glass for being no less than 60%, more preferably 60～64% volume ratios to being less than 66% volume ratio.Here, the SiO that consists of 47～55% mass ratioes of glass 2, 1～3% mass ratio B 2O 3, 7～16.5% mass ratioes Al 2O 3And the alkaline earth oxide of 30～40% mass ratioes.
Except by at least one or a plurality of layer in other glass-ceramic mixed layer the glass-ceramic mixed layer of making according to the low-temperature co-burning ceramic material (III) of the 3rd embodiment, form by the low-temperature co-burning ceramic material of describing among the Japanese patent application 1-132194 for example.Preferably, all other glass-ceramic mixed layers are all formed by the low-temperature co-burning ceramic material of describing among the Japanese patent application 1-132194.
The manufacture method of describing in the multi-layer wiring board according to first embodiment can be applied to the multi-layer wiring board according to the 3rd embodiment under the same conditions.
[embodiment]
(first embodiment)
Next, will first embodiment be described in more detail by example. the powder of glass, aluminium oxide, titanium oxide and cordierite mixed 16 hours by ball mill, to obtain the composition shown in the table 1.Then, for example the solvent of toluene and ethanol and adhesive are added in the mixed-powder (average particle size particle size is 1.5 μ m), are used to produce the pastel of coating material with preparation.Here, make the SiO that consists of 50% mass ratio that oxide represents of glass 2The B of+2% mass ratio 2O 3The Al of+11% mass ratio 2O 3The SrO of the CaO+33% mass ratio of the MgO+3% mass ratio of+1% mass ratio.Use this coating material to form ceramic green sheet by The tape casting.After firing, the thickness of ceramic green sheet is adjusted to 80 μ m.6 ceramic green sheets are stacked, are pressed then, fire 2 hours at 850 to 950 ℃ then, produce single composition, thickness is the multilager base plate of 480 μ m.The multilager base plate of being produced at the DIELECTRIC CONSTANT r of room temperature under the 1.9GHz frequency, Q (1/tan δ), the thermal linear expansion coefficient α in 50 to 300 ℃ of scopes, and bending strength is shown in the table 1.The network analyzer (production number HP8510C) that dielectric constant and tan δ use Hewlett-Packard to make is measured by perturbation method.The dilatometer (production number 5000) that thermal linear expansion coefficient uses MAC company to make is measured. and the versatile material test machine (production number 5543) that bending strength uses INSTRON company to make is measured by 3 warpage methods.
Table 1
Figure C20051008091100251
(by adding the control-1 of cordierite) to thermal linear expansion coefficient
At first, when as comparison example 1 and 2 and example 1 to 3 shown in when replacing aluminium oxide with cordierite, promptly when x at 0.72 glass+0.14TiO 2+ (0.14-x) Al 2O 3+ x Mg 2Al 4Si 5O 18Composition formula in when changing, thermal linear expansion coefficient changes as shown in Figure 3, and dielectric constant changes as shown in Figure 4.Cordierite have in 50 to 300 ℃ of scopes 1.8 * 10 -6/ ℃ thermal linear expansion coefficient, and have 4.8 dielectric constant.On the other hand, aluminium oxide have in 50 to 300 ℃ of scopes 7.2 * 10 -6/ ℃ thermal linear expansion coefficient, and have 9.8 dielectric constant.Therefore, when the replacement amount of replacing aluminium oxide with cordierite increased, because the addition of cordierite increases, so the thermal linear expansion coefficient reduction as shown in Figure 3, and dielectric constant reduced as shown in Figure 4.But, dielectric constant difference between aluminium oxide and the cordierite is 5.0, so compare with the change of thermal linear expansion coefficient, the change milder of dielectric constant. therefore, know that thermal linear expansion coefficient can reduce by replacing aluminium oxide with cordierite, and can not change the dielectric constant of low-temperature co-burning ceramic material greatly.
(by adding the control-2 of cordierite) to thermal linear expansion coefficient
Next, when as comparison example 4 and 5 and example 11 to 13 shown in when replacing titanium oxide with cordierite, promptly when x at the TiO of 0.60 glass+(0.39-x) 2+ 0.01Al 2O 3+ xMg 2Al 4Si 5O 18Composition formula in when changing, thermal linear expansion coefficient changes as shown in Figure 5, and dielectric constant changes as shown in Figure 6.Cordierite have in 50 to 300 ℃ of scopes 1.8 * 10 -6/ ℃ thermal linear expansion coefficient, and have 4.8 dielectric constant.On the other hand, titanium oxide have in 50 to 300 ℃ of scopes 11.5 * 10 -6/ ℃ thermal linear expansion coefficient, and have 104 dielectric constant.Therefore, when the replacement amount of replacing titanium oxide with cordierite increased, because the addition of cordierite increases, so the thermal linear expansion coefficient reduction as shown in Figure 5, and dielectric constant reduced as shown in Figure 6.But the dielectric constant difference between titanium oxide and the cordierite is 99.2, so compare with change in dielectric constant shown in Figure 4, the change of this dielectric constant is bigger.In addition, the same big in thermal linear expansion coefficient difference shown in Figure 5 and the situation shown in Figure 3.Therefore, clear by replacing titanium oxide with cordierite, may reduce the dielectric constant and the thermal linear expansion coefficient of low-temperature co-burning ceramic material simultaneously.
As mentioned above, known by adding cordierite and may control thermal linear expansion coefficient, but multilager base plate need be fine and close sintered body, even and obtained fine and close sintered body, multilager base plate also needs to have the bending strength of the predetermined value of being not less than.In addition, multilager base plate need have in 50 to 300 ℃ of scopes 5.9 * 10 -6To 6.4 * 10 -6/ ℃ thermal linear expansion coefficient, and at room temperature under the frequency of 1.9GHz, have and be not less than 10 dielectric constant.In comparison example 1, content of cordierite is 2% volume ratio, and thermal linear expansion coefficient is up to 6.54 * 10 -6/ ℃.In comparison example 2, thermal linear expansion coefficient is low to 5.82 * 10 -6/ ℃.In comparison example 3, the content of glass composition only is 57% volume ratio, therefore can not obtain fine and close sintered body.In comparison example 4, the content of titanium oxide is up to 27% volume ratio, so thermal linear expansion coefficient is up to 6.41 * 10 -6/ ℃.In comparison example 5, content of cordierite is up to 16% volume ratio, so thermal linear expansion coefficient is low to 5.80 * 10 -6/ ℃.In comparison example 6 to 8, the addition of aluminium oxide is big, so dielectric constant is less than 10.In comparison example 9, the content of glass composition is 80% volume ratio, so bending strength is low.In comparison example 10, the content of titanium oxide is little of 9% volume ratio, because dielectric constant is less than 10.
(Primary Study of the warpage of the multilager base plate that difference is formed)
10 millimeters ceramic green sheets that foursquare two types difference is formed have been formed respectively, and the cambium layer laminate materials is to have 6 layers stepped construction. then, stacking material is fired simultaneously, comprises that with manufacturing 6 layers of difference are formed, thickness is the multilager base plate of 480 μ m.Here, what make a glass-ceramic mixed layer consists of 70% volume ratio glass-30% volume ratio aluminium oxide (be expressed as S form), and make other glass-ceramic mixed layer consist of 70% volume ratio glass-15% volume ratio aluminium oxide-15% volume ratio titanium oxide (being expressed as T forms).Here, make the SiO that consists of 50% mass ratio that oxide represents of the glass of each layer 2The B of+2% mass ratio 2O 3The Al of+11% mass ratio 2O 3The SrO of the CaO+33% mass ratio of the MgO+3% mass ratio of+1% mass ratio.The stepped construction of multilager base plate is that Fig. 7 A is to the stepped construction shown in the 7G.The warpage amplitude (mean value) of this moment illustrates in Fig. 7 together.Referring now to Fig. 7, very clear, shown in Fig. 7 D least the symmetry stepped construction in the warpage maximum, and in the stepped construction of the multilager base plate that only has same composition shown in Fig. 7 A and the 7G warpage minimum.
According to result shown in Figure 7, find, in having the multilager base plate of stepped construction shown in Figure 1, warpage maximum in the least symmetrical layers stack structure shown in Fig. 1 C.Therefore, after this, making the stepped construction shown in Fig. 1 C is destination layer stack structure to be evaluated.This is because if can make the warpage of the stepped construction shown in Fig. 1 C little, just can make the warpage in other stepped construction littler.
(research of the warpage of the multilager base plate that difference is formed)
Form the ceramic green sheet of two types difference composition respectively, and the cambium layer laminate materials is to have the stack structure layer by layer of 6 shown in Fig. 1 C.Then, stacking material is fired simultaneously, comprises that with manufacturing 6 layers of difference are formed, thickness is the multilager base plate of 480 μ m.Make the multilager base plate of 10 millimeters squares, 50 millimeters squares and three kinds of sizes of 100 millimeters squares.Here, make each composition shown in the table 1 that consists of of a glass-ceramic mixed layer.What make each layer in other glass-ceramic mixed layer consists of 70% volume ratio glass and 30% volume ratio aluminium oxide.Here, make the SiO that consists of 50% mass ratio that oxide represents of the glass of each layer 2The B of+2% mass ratio 2O 3The Al of+11% mass ratio 2O 3The SrO of the CaO+33% mass ratio of the MgO+3% mass ratio of+1% mass ratio.In other glass-ceramic mixed layer each layer have in 50 to 300 ℃ of scopes 6.15 * 10 -6/ ℃ thermal linear expansion coefficient, and 7.3 dielectric constant.
The thermal linear expansion coefficient α of glass-ceramic mixed layer in 50 to 300 ℃ scope, the amount of warpage of each substrate of 10 millimeters squares, 50 millimeters squares and 100 millimeters square multilager base plates, and the warpage evaluation of multilager base plate is shown in the table 2.When the warpage of 50 millimeters square substrate was not more than 200 μ m, the warpage evaluation of multilager base plate was by circle symbol (zero) expression, and when the warpage of 50 millimeters square substrate during greater than 200 μ m, the warpage evaluation of multilager base plate is represented by cross (*).In addition, in evaluation, increase the judgement that whether the dielectric constant difference between the glass-ceramic mixed layer is not less than predetermined value to multilager base plate.When multilager base plate satisfied following conditions: the warpage of 50 millimeters square substrate was not more than 200 μ m; The dielectric constant of a glass-ceramic mixed layer is not less than 10; And the bending strength shown in the table 1 is not less than 190MPa, the overall merit that multilager base plate is provided is the multilager base plate of being represented by circle symbol (zero), and when multilager base plate did not satisfy these conditions, the overall merit that multilager base plate is provided was the multilager base plate of being represented by cross (*).The result is shown in the table 2.
Table 2
Figure C20051008091100291
Very clear from the result shown in the table 2, the thermal linear expansion coefficient difference between other glass-ceramic mixed layer and this glass-ceramic mixed layer more hour, the warpage of substrate is also more little.When other glass-ceramic mixed layer have in 50 to 300 ℃ of scopes 6.15 * 10 -6/ ℃ thermal linear expansion coefficient, and this glass-ceramic mixed layer have in 50 to 300 ℃ of scopes 5.90 * 10 -6To 6.40 * 10 -6/ ℃ thermal linear expansion coefficient the time, the warpage of substrate is very little.That is, when making the thermal linear expansion coefficient difference be not more than 0.25 * 10 -6/ ℃ the time, can make the warpage of 50 millimeters square substrate be not more than 200 μ m.More preferably, when making the thermal linear expansion coefficient difference be not more than 0.1 * 10 -6/ ℃ the time, under many circumstances, can make the warpage of 50 millimeters square substrate be not more than 100 μ m.More preferably, when making the thermal linear expansion coefficient difference be not more than 0.05 * 10 -6/ ℃ the time, can make the warpage of 100 millimeters square substrate be not more than 200 μ m.In comparison example 1,2,4 and 5, the thermal linear expansion coefficient difference is big, and the warpage of substrate is big.In comparison example 3, can not obtain fine and close sintered body.In comparison example 6 to 8 and 10, the warpage of substrate is little, but the thermal linear expansion coefficient difference between the glass-ceramic mixed layer is little, is useless so form two or more types glass-ceramic mixed layer.In comparison example 9, the dielectric constant difference between the glass-ceramic mixed layer is little, and the bending strength of this glass-ceramic mixed layer is little, so think that the bending strength of multilager base plate itself is also very little.Shown in example, can make and comprise glass-ceramic mixed layer with differing dielectric constant and multilager base plate with very little warpage.In view of the above, may in multilager base plate, insert thickness and the size that high power capacity electric capacity reduces module by keeping pinpoint accuracy ground, and increase the flexibility ratio in the substrate design.
(second embodiment)
Next, will second embodiment be described in more detail by example.The powder of glass, titanium oxide and cordierite mixed 16 hours by ball mill, to obtain the composition shown in the table 3.Then, for example the solvent of toluene and ethanol and adhesive are added in the mixed-powder (average particle size particle size is 1.5 μ m), are used to produce the pastel of coating material with preparation.Here, make the SiO that consists of 50% mass ratio that oxide represents of glass 2The B of+2% mass ratio 2O 3The Al of+11% mass ratio 2O 3The SrO of the CaO+33% mass ratio of the MgO+3% mass ratio of+1% mass ratio.Use this coating material to form ceramic green sheet by The tape casting.After firing, the thickness of ceramic green sheet is adjusted to 80 μ m.6 ceramic green sheets are stacked, are pressed then, fire 2 hours at 850 to 950 ℃ then, produce single composition, thickness is the multilager base plate of 480 μ m.The DIELECTRIC CONSTANT r under room temperature and 1.9GHz frequency of the multilager base plate of being produced, Q (1/tan δ), the thermal linear expansion coefficient α in 50 to 300 ℃ of scopes, and bending strength is shown in the table 3.Here, dielectric constant, tan δ, thermal linear expansion coefficient and bending strength are measured by machine and the method for measurement described in the example of first embodiment.
Table 3
Figure C20051008091100311
(by adding the control-1 of cordierite) to thermal linear expansion coefficient
At first, when as comparison example 11 and 12 and example 17 to 19 shown in when replacing aluminium oxide with cordierite, promptly when x at the TiO of 0.60 glass+(0.40-x) 2+ xMg 2Al 4Si 5O 18Composition formula in when changing, thermal linear expansion coefficient changes as shown in Figure 8, and dielectric constant changes as shown in Figure 9.In addition, when as comparison example 14 and 15 and example 24 to 27 shown in when replacing titanium oxide with cordierite, promptly when x at the TiO of 0.78 glass+(0.22-x) 2+ xMg 2Al 4Si 5O 18Composition formula in when changing, thermal linear expansion coefficient changes as shown in figure 10, and dielectric constant changes as shown in figure 11.Cordierite have in 50 to 300 ℃ of scopes 1.8 * 10 -6/ ℃ thermal linear expansion coefficient, and have 4.8 dielectric constant.On the other hand, titanium oxide have in 50 to 300 ℃ of scopes 11.5 * 10 -6/ ℃ thermal linear expansion coefficient, and have 104 dielectric constant.Therefore, when the replacement amount of replacing titanium oxide with cordierite increased, because the addition of cordierite increases, so thermal linear expansion coefficient reduces shown in Fig. 8,10, and dielectric constant reduced shown in Fig. 9,11.But when adding under the situation of cordierite in scope shown in Figure 9, dielectric constant is not less than 13.5, adds under the situation of cordierite in scope shown in Figure 11, and dielectric constant is not less than 10.5.Therefore, in both of these case any, substrate had be not less than 10 dielectric constant.Therefore, very clear, by replacing titanium oxide, may reduce the thermal linear expansion coefficient of low-temperature co-burning ceramic material, and its dielectric constant be remained be not less than 10 value with cordierite.
As mentioned above, known by adding cordierite and can control thermal linear expansion coefficient, but multilager base plate need be fine and close sintered body, even and can obtain fine and close sintered body, multilager base plate also needs to have the bending strength of the predetermined value of being not less than.In addition, multilager base plate need have in 50 to 300 ℃ of scopes 5.9 * 10 -6To 6.4 * 10 -6/ ℃ thermal linear expansion coefficient, at room temperature under the frequency of 1.9GHz, have and be not less than 10 dielectric constant.In comparison example 14, only contain the cordierite of 4% volume ratio, thermal linear expansion coefficient is up to 6.44 * 10 -6/ ℃.In comparison example 12, content of cordierite is up to 16% volume ratio, and thermal linear expansion coefficient is low to 5.87 * 10 -6/ ℃.In comparison example 11, the content of titanium oxide is up to 28% volume ratio, so thermal linear expansion coefficient is up to 6.42 * 10 -6/ ℃.In comparison example 13, the content of glass composition is 58% volume ratio only, does not fire.In comparison example 15, the content of titanium oxide only is 13% volume ratio, so thermal linear expansion coefficient is low to 5.78 * 10 -6/ ℃, therefore can not obtain fine and close sintered body.In comparison example 16, the content of glass composition is 80% volume ratio, so bending strength is lower.
(Primary Study of the warpage of the multilager base plate that difference is formed)
Though in the example of first embodiment, carried out the Primary Study of the warpage of multilager base plate that difference is formed, in the example of second embodiment, also will similarly estimate the stepped construction shown in Fig. 1 C below.
(research of the warpage of the multilager base plate that difference is formed)
Form the ceramic green sheet of two types difference composition respectively, and the cambium layer laminate materials is to have the stack structure layer by layer of 6 shown in Fig. 1 C.Then, stacking material is fired simultaneously, with manufacturing comprise 6 different glass-ceramic mixed layers of forming, thickness is the multilager base plate of 480 μ m.Make the multilager base plate of 10 millimeters squares, 50 millimeters squares and three kinds of sizes of 100 millimeters squares.Here, make each composition shown in the table 3 that consists of of a glass-ceramic mixed layer.What make each layer in other glass-ceramic mixed layer consists of 70% volume ratio glass and 30% volume ratio aluminium oxide.Here, make the SiO that consists of 50% mass ratio that oxide represents of the glass of each layer 2The B of+2% mass ratio 2O 3The Al of+11% mass ratio 2O 3The SrO of the CaO+33% mass ratio of the MgO+3% mass ratio of+1% mass ratio.In other glass-ceramic mixed layer each layer have in 50 to 300 ℃ of scopes 6.15 * 10 -6/ ℃ thermal linear expansion coefficient, and 7.3 dielectric constant.
The thermal linear expansion coefficient α of glass-ceramic mixed layer in 50 to 300 ℃ scope, the amount of warpage of each substrate of 10 millimeters squares, 50 millimeters squares and 100 millimeters square multilager base plates, and the warpage evaluation of multilager base plate is shown in the table 4.When the warpage of 50 millimeters square substrate was not more than 200 μ m, the warpage evaluation of multilager base plate was by circle symbol (zero) expression, and when the warpage of 50 millimeters square substrate during greater than 200 μ m, the warpage evaluation of multilager base plate is represented by cross (*).In addition, in evaluation, increase the judgement that whether the dielectric constant difference between the glass-ceramic mixed layer is not less than predetermined value to multilager base plate.When multilager base plate satisfied following conditions: the warpage of 50 millimeters square substrate was not more than 200 μ m; The dielectric constant of a glass-ceramic mixed layer is not less than 10; And the bending strength shown in the table 3 is not less than 190MPa, the overall merit that multilager base plate is provided is the multilager base plate of being represented by circle symbol (zero), and when multilager base plate did not satisfy these conditions, the overall merit that multilager base plate is provided was the multilager base plate of being represented by cross (*). the result is shown in the table 4.
Table 4
Figure C20051008091100341
Very clear from the result shown in the table 4, the thermal linear expansion coefficient difference between other glass-ceramic mixed layer and this glass-ceramic mixed layer more hour, the warpage of substrate is also more little.When other glass-ceramic mixed layer have in 50 to 300 ℃ of scopes 6.15 * 10 -6/ ℃ thermal linear expansion coefficient, and this glass-ceramic mixed layer have in 50 to 300 ℃ of scopes 5.90 * 10 -6To 6.40 * 10 -6/ ℃ thermal linear expansion coefficient the time, the warpage of substrate is little.That is, when making the thermal linear expansion coefficient difference be not more than 0.25 * 10 -6/ ℃ the time, can make the warpage of 50 millimeters square substrate be not more than 200 μ m.More preferably, when making the thermal linear expansion coefficient difference be not more than 0.1 * 10 -6/ ℃ the time, can make the warpage of 50 millimeters square substrate be not more than 100 μ m.More preferably, when making the thermal linear expansion coefficient difference be not more than 0.05 * 10 -6/ ℃ the time, can make the warpage of 100 millimeters square substrate be not more than 200 μ m.In comparison example 11,12,14 and 15, the thermal linear expansion coefficient difference is big, and the warpage of substrate is big.In comparison example 13, can not obtain fine and close sintered body.In comparison example 16, the bending strength of this glass-ceramic mixed layer is little, so think that the bending strength of multilager base plate itself is also little.Shown in example, can make and comprise glass-ceramic mixed layer with differing dielectric constant and multilager base plate with very little warpage.In view of the above, may in multilager base plate, insert thickness and the size that high power capacity electric capacity reduces module by keeping pinpoint accuracy ground, and increase the flexibility ratio in the substrate design.
(the 3rd embodiment)
Next, will the 3rd embodiment be described in more detail by example.The powder of glass, titanium oxide and mullite mixed 16 hours by ball mill, to obtain the composition shown in the table 5.Then, for example the solvent of toluene and ethanol and adhesive are added in the mixed-powder (average particle size particle size is 1.5 μ m), are used to produce the pastel of coating material with preparation.Here, make the SiO that consists of 50% mass ratio that oxide represents of glass 2The B of+2% mass ratio 2O 3The Al of+11% mass ratio 2O 3The SrO of the CaO+33% mass ratio of the MgO+3% mass ratio of+1% mass ratio.Use this coating material to form ceramic green sheet by The tape casting.After firing, the thickness of ceramic green sheet is adjusted to 80 μ m.6 ceramic green sheets are stacked, are pressed then, fire 2 hours at 850 to 950 ℃ then, produce single composition, thickness is the multilager base plate of 480 μ m.The DIELECTRIC CONSTANT r under room temperature and 1.9GHz frequency of the multilager base plate of being produced, Q (1/tan δ), the thermal linear expansion coefficient α in 50 to 300 ℃ of scopes, and bending strength is shown in the table 5.Here, dielectric constant, tan δ and thermal linear expansion coefficient are measured by machine and the method for measurement described in the example of first embodiment.
Table 5
Figure C20051008091100361
(by adding the control-1 of mullite) to thermal linear expansion coefficient
At first, when as comparison example 17 and 18 and example 28 to 31 shown in when replacing glass with mullite, promptly when x at (0.88-x) glass+0.12TiO 2+ xAl 6Si 2O 13Composition formula in when changing, thermal linear expansion coefficient changes as shown in figure 12, and dielectric constant changes as shown in figure 13.In addition, when as comparison example 19 and 20 and example 32 to 34 shown in when replacing titanium oxide with mullite, promptly when x at the TiO of 0.60 glass+(0.40-x) 2+ xAl 6Si 2O 13Composition formula in when changing, thermal linear expansion coefficient changes as shown in figure 14, and dielectric constant changes as shown in figure 15.Mullite have in 50 to 300 ℃ of scopes 5.0 * 10 -6/ ℃ thermal linear expansion coefficient, and have 7.4 dielectric constant.On the other hand, the glass that uses in this example have in 50 to 300 ℃ of scopes 5.7 * 10 -6/ ℃ thermal linear expansion coefficient, and have 6.4 dielectric constant.Therefore, when the replacement amount of replacing glass with mullite increased, because the addition of mullite increases, so the thermal linear expansion coefficient reduction as shown in figure 12, but dielectric constant was not subjected to the influence that the mullite addition increases, as shown in figure 13.On the other hand, titanium oxide have in 50 to 300 ℃ of scopes 11.5 * 10 -6/ ℃ thermal linear expansion coefficient, and have 104 dielectric constant.Therefore, when the replacement amount of replacing titanium oxide with mullite increased, because the addition of mullite increases, so the thermal linear expansion coefficient reduction as shown in figure 14, and dielectric constant reduced as shown in figure 15.But under the situation of the content of mullite less than 30% volume ratio, dielectric constant is not less than 10 in Figure 15, can make to have the substrate that is not less than 10 dielectric constant.Therefore, very clear, by replace glass or titanium oxide with mullite, can reduce the thermal linear expansion coefficient of low-temperature co-burning ceramic material, and its dielectric constant be remained be not less than 10 value.
As mentioned above, known by adding mullite and may control thermal linear expansion coefficient, but low-temperature co-fired ceramic substrate need be fine and close sintered body.In addition, low-temperature co-fired ceramic substrate need have in 50 to 300 ℃ of scopes 5.9 * 10 -6To 6.4 * 10 -6/ ℃ thermal linear expansion coefficient, at room temperature under the frequency of 1.9GHz, have and be not less than 10 dielectric constant.In comparison example 17, the content of glass composition is little of 58% volume ratio, so can not obtain fine and close sintered body.In comparison example 18, the content of mullite is 22% volume ratio, and thermal linear expansion coefficient is up to 6.41 * 10 -6/ ℃.In comparison example 19, the content of mullite is 30% volume ratio, and dielectric constant is low to 9.8.In comparison example 20, the content of titanium oxide is 13% volume ratio, so thermal linear expansion coefficient is up to 6.42 * 10 -6/ ℃.
(Primary Study of the warpage of the multilager base plate that difference is formed)
Though in the example of first embodiment, carried out the Primary Study of the warpage of multilager base plate that difference is formed, in the example of the 3rd embodiment, also will similarly estimate the stepped construction shown in Fig. 1 C below.
(research of the warpage of the multilager base plate that difference is formed)
Form the ceramic green sheet of two types difference composition respectively, and the cambium layer laminate materials is to have the stack structure layer by layer of 6 shown in Fig. 1 C.Then, stacking material is fired simultaneously, with manufacturing comprise 6 layers of different glass-ceramic mixed layer of forming, thickness is the multilager base plate of 480 μ m.Make the multilager base plate of 10 millimeters squares and two kinds of sizes of 50 millimeters squares.Here, make each composition shown in the table 5 that consists of of a glass-ceramic mixed layer.What make each layer in other glass-ceramic mixed layer consists of 70% volume ratio glass and 30% volume ratio aluminium oxide.Here, make the SiO that consists of 50% mass ratio that oxide represents of the glass of each layer 2The B of+2% mass ratio 2O 3The Al of+11% mass ratio 2O 3The SrO of the CaO+33% mass ratio of the MgO+3% mass ratio of+1% mass ratio.In other glass-ceramic mixed layer each layer have in 50 to 300 ℃ of scopes 6.15 * 10 -6/ ℃ thermal linear expansion coefficient, and 7.3 dielectric constant.
The thermal linear expansion coefficient α of glass-ceramic mixed layer in 50 to 300 ℃ scope, the amount of warpage of the substrate of 10 millimeters squares and 50 millimeters square multilager base plates, and the warpage evaluation of multilager base plate is shown in the table 6.When the warpage of 50 millimeters square substrate was not more than 200 μ m, the warpage evaluation of multilager base plate was by circle symbol (zero) expression, and when the warpage of 50 millimeters square substrate during greater than 200 μ m, the warpage evaluation of multilager base plate is represented by cross (*).In addition, in evaluation, increase the judgement that whether difference of the DIELECTRIC CONSTANT r between the glass-ceramic mixed layer is not less than predetermined value to multilager base plate.When multilager base plate satisfied following conditions: the warpage of 50 millimeters square substrate was not more than 200 μ m, the dielectric constant of a glass-ceramic mixed layer is not less than 10, the overall merit that multilager base plate is provided is the multilager base plate of being represented by circle symbol (zero), and when multilager base plate did not satisfy these conditions, the overall merit that multilager base plate is provided was the multilager base plate of being represented by cross (*).The result is shown in the table 6.
Table 6
Figure C20051008091100381
Very clear from the result shown in the table 6, the thermal linear expansion coefficient difference between other glass-ceramic mixed layer and glass-ceramic mixed layer more hour, the warpage of substrate is also more little.When other glass-ceramic mixed layer have in 50 to 300 ℃ of scopes 6.15 * 10 -6/ ℃ thermal linear expansion coefficient, and glass-ceramic mixed layer have in 50 to 300 ℃ of scopes 5.90 * 10 -6To 6.40 * 10 -6/ ℃ thermal linear expansion coefficient the time, the warpage of substrate is little.That is, when making the thermal linear expansion coefficient difference be not more than 0.25 * 10 -6/ ℃ the time, can make the warpage of 50 millimeters square substrate be not more than 200 μ m.More preferably, when making the thermal linear expansion coefficient difference be not more than 0.21 * 10 -6/ ℃ the time, can make the warpage of 50 millimeters square substrate be not more than 100 μ m.In comparison example 18 and 20, the thermal linear expansion coefficient difference is big, and the warpage of substrate is big.In comparison example 17, can not obtain fine and close sintered body.In comparison example 19, dielectric constant is low to 9.8.Shown in example, can make and comprise glass-ceramic mixed layer with differing dielectric constant and multilager base plate with very little warpage.In view of the above, may in multilager base plate, insert thickness and the size that high power capacity electric capacity reduces module by keeping pinpoint accuracy ground, and increase the flexibility ratio in the substrate design.
[industrial applicibility]
Use can be used as according to the multi-layer wiring board of low-temperature co-burning ceramic material of the present invention LTCC module, for example high-frequency laminating module, antenna modular converter and filtering module.

Claims (17)

1. low-temperature co-burning ceramic material comprises:
The glass of 60～78% volume ratios, this glass consists of the SiO of 46～60% mass ratioes 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, this alkaline earth oxide of at least 60% mass ratio is SrO;
Greater than 0 to the aluminium oxide that is not more than 16% volume ratio;
The titanium oxide of 10～26% volume ratios; And
The cordierite of 2～15% volume ratios.
2. low-temperature co-burning ceramic material comprises:
The glass of 60～78% volume ratios, this glass consists of the SiO of 46～60% mass ratioes 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, this alkaline earth oxide of at least 60% mass ratio is SrO;
The titanium oxide of 14～27% volume ratios; And
The cordierite of 5～15.5% volume ratios.
3. low-temperature co-burning ceramic material as claimed in claim 1 or 2, wherein, the thermal linear expansion coefficient in 50 to 300 ℃ scope is 5.90 * 10 -6To 6.40 * 10 -6/ ℃.
4. low-temperature co-burning ceramic material as claimed in claim 1 or 2, wherein, at room temperature the dielectric constant under the frequency of 1.9GHz is not less than 10.
5. low-temperature co-burning ceramic material as claimed in claim 3, wherein, at room temperature the dielectric constant under the frequency of 1.9GHz is not less than 10.
6. the multi-layer wiring board of the stacked type of glass-ceramic mixed layer wherein, improvement wherein is that one deck at least of glass-ceramic mixed layer is made by the low-temperature co-burning ceramic material that comprises following composition:
The glass of 60～78% volume ratios, this glass consists of the SiO of 46～60% mass ratioes 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, this alkaline earth oxide of at least 60% mass ratio is SrO;
Greater than 0 to the aluminium oxide that is not more than 16% volume ratio;
The titanium oxide of 10～26% volume ratios; And
The cordierite of 2～15% volume ratios.
7. the multi-layer wiring board of the stacked type of glass-ceramic mixed layer wherein, improvement wherein is that one deck at least of glass-ceramic mixed layer is made by the low-temperature co-burning ceramic material that comprises following composition:
The glass of 60～78% volume ratios, this glass consists of the SiO of 46～60% mass ratioes 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, this alkaline earth oxide of at least 60% mass ratio is SrO;
The titanium oxide of 14～27% volume ratios; And
The cordierite of 5～15.5% volume ratios.
8. as claim 6 or 7 described multi-layer wiring boards, wherein, this low-temperature co-burning ceramic material have in 50 to 300 ℃ of scopes 5.90 * 10 -6To 6.40 * 10 -6/ ℃ thermal linear expansion coefficient, and the dielectric constant that at room temperature under the frequency of 1.9GHz, is not less than 10.
9. as claim 6 or 7 described multi-layer wiring boards, wherein, glass-ceramic mixed layer of being made by this low-temperature co-burning ceramic material and the thermal linear expansion coefficient difference in 50 to 300 ℃ of scopes between other glass-ceramic mixed layer except that this glass-ceramic mixed layer are not more than 0.25 * 10 -6/ ℃.
10. multi-layer wiring board as claimed in claim 8, wherein, glass-ceramic mixed layer of being made by this low-temperature co-burning ceramic material and the thermal linear expansion coefficient difference in 50 to 300 ℃ scope between other glass-ceramic mixed layer except that this glass-ceramic mixed layer are not more than 0.25 * 10 -6/ ℃.
11. as claim 6 or 7 described multi-layer wiring boards, wherein, other glass-ceramic mixed layer except the glass-ceramic mixed layer of being made by this low-temperature co-burning ceramic material at room temperature has 5 to 8 dielectric constant under the 1.9GHz frequency.
12. multi-layer wiring board as claimed in claim 8, wherein, other glass-ceramic mixed layer except the glass-ceramic mixed layer of being made by this low-temperature co-burning ceramic material at room temperature has 5 to 8 dielectric constant under the 1.9GHz frequency.
13. multi-layer wiring board as claimed in claim 9, wherein, other glass-ceramic mixed layer except the glass-ceramic mixed layer of being made by this low-temperature co-burning ceramic material at room temperature has 5 to 8 dielectric constant under the 1.9GHz frequency.
14. multi-layer wiring board as claimed in claim 10, wherein, other glass-ceramic mixed layer except the glass-ceramic mixed layer of being made by this low-temperature co-burning ceramic material at room temperature has 5 to 8 dielectric constant under the 1.9GHz frequency.
15. as claim 6 or 7 described multi-layer wiring boards, wherein, except being made by the low-temperature co-burning ceramic material that comprises following compositions by other glass-ceramic mixed layer the made glass-ceramic mixed layer of the low-temperature co-burning ceramic material described in claim 6 or 7:
The glass of 58～76% volume ratios, this glass consists of the SiO of 46～60% mass ratioes 2, 0.5～5% mass ratio B 2O 3, 6～17.5% mass ratioes Al 2O 3And the alkaline earth oxide of 25～45% mass ratioes, this alkaline earth oxide of at least 60% mass ratio is SrO; And
The aluminium oxide of 24～42% volume ratios.
16. as claim 6 or 7 described multi-layer wiring boards, wherein, the warpage of this multi-layer wiring board is not more than 200 μ m for 50 millimeters foursquare sizes.
17. as claim 6 or 7 described multi-layer wiring boards, wherein, the warpage of this multi-layer wiring board is not more than 200 μ m for 100 millimeters foursquare sizes.
CN 200510080911 2004-06-28 2005-06-28 The multi-layer wiring board of low-temperature co-burning ceramic material and this material of use Expired - Fee Related CN100561604C (en)

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