WO2014002306A1 - アルミナ質セラミックスおよびそれを用いたセラミック配線基板ならびにセラミックパッケージ - Google Patents
アルミナ質セラミックスおよびそれを用いたセラミック配線基板ならびにセラミックパッケージ Download PDFInfo
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/3262—Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO
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- C04B2235/76—Crystal structural characteristics, e.g. symmetry
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- H01L23/06—Containers; Seals characterised by the material of the container or its electrical properties
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Definitions
- the present invention relates to an alumina ceramic suitable for an insulating substrate requiring high strength, a ceramic wiring substrate and a ceramic package to which the alumina ceramic is applied.
- ceramic wiring boards have been widely used as wiring boards used in packages for storing electronic components such as semiconductor elements and crystal resonators in terms of relatively high mechanical strength and excellent airtightness.
- FIG. 2 shows an example of an exploded perspective view of a ceramic package for mounting electronic components.
- a ceramic package for mounting an electronic component such as a crystal application product
- a conductor 102 is formed on the surface of a ceramic substrate 101 made of an alumina sintered body, and the electronic component mounted on the surface of the conductor 102
- a metal member 105 here, a lid 105
- hermetically sealing for example, a crystal application product
- 109 is bonded via a bonding member 107 such as silver solder coated on the metallized layer 103.
- a bonding member 107 such as silver solder coated on the metallized layer 103.
- the present applicant has previously proposed low-temperature fired alumina ceramics that can be fired simultaneously with a copper-based conductor as a substrate material applied to this type of ceramic package (for example, Patent Document 2 and Patent Document 2). 3).
- the width w 0 of the thickness t and the substrate bank portion 101b of the substrate bottom portion 101a is, for example, when the extremely thin as 0.5mm or less, be applied to the substrate materials described above, joining the cover member 105 In doing so, there has been a problem that the substrate bottom 101a and the substrate bank 101b of the ceramic substrate 101 are deformed, which causes cracks in the ceramic substrate 101.
- an object of the present invention is to provide an alumina ceramic having a high mechanical strength, a high-strength wiring board and a ceramic package to which the ceramic is applied.
- the alumina-based ceramic of the present invention contains aluminum oxide as a main component, contains manganese in an amount of 2.0 to 5.0% by mass in terms of Mn 2 O 3 and silicon in an amount of 3.0 to 7.5% by mass in terms of SiO 2 ,
- the ratio of the crystal phase mainly composed of aluminum oxide obtained by X-ray diffraction Rietveld analysis is 99.0 to 99.9% by mass, and the average grain size of the crystal phase is 0.8 to 1. It is 5 ⁇ m and the area ratio of voids per unit area is 3.1% or less.
- the ceramic wiring board of the present invention is a ceramic wiring board having a metallized layer on the surface of an insulating substrate, wherein the insulating substrate is made of the above-mentioned alumina ceramics.
- the ceramic package of the present invention is a ceramic package in which a metal member is bonded to the surface of an insulating substrate via a bonding member, and the insulating substrate is made of the above-mentioned alumina ceramics.
- an alumina ceramic having high mechanical strength can be obtained. Further, by applying such alumina ceramics as a material for the insulating substrate, a high-strength ceramic wiring substrate and a ceramic package can be obtained.
- the alumina ceramic of the present embodiment contains aluminum oxide as a main component, contains 2.0 to 5.0% by mass of manganese in terms of Mn 2 O 3 and 3.0 to 7.5% by mass of silicon in terms of SiO 2. It is out.
- the ratio of the crystal phase mainly composed of aluminum oxide, which is obtained by the X-ray diffraction Rietveld analysis, is 99.0 to 99.9% by mass.
- this alumina ceramic has an average particle size of a crystal phase mainly composed of aluminum oxide (hereinafter referred to as alumina crystal phase) of 0.8 to 1.5 ⁇ m, and a void area ratio per unit area. Is 3.1% or less.
- the proportion of the alumina crystal phase as the main crystal phase is as high as 99% by mass or more, Since the average grain size of the crystal phase is small and the area ratio of voids is small, the material is excellent in mechanical properties, and an alumina ceramic having a three-point bending strength of 680 MPa or more can be realized.
- a crystal phase derived from a composite oxide such as MnAl 2 O 4 is formed at the grain boundary of the alumina crystal phase of the alumina ceramic which is a porcelain.
- the ratio of the identifiable crystal phase present at the grain boundary of the alumina crystal phase is 1% by mass or less, and the alumina crystal phase is amorphous derived from manganese oxide or silicon oxide.
- the proportion of the alumina crystal phase obtained by Rietveld analysis of X-ray diffraction is higher than 99.9% by mass, the amount of sintering aid such as manganese oxide or silicon oxide is considerably small.
- the adhesive strength between the crystal phases decreases, and in this case also, the mechanical strength tends to decrease.
- the content of manganese contained in the alumina ceramic is less than 2.0% by mass in terms of Mn 2 O 3 conversion, or the content of silicon in terms of SiO 2 is less than 3.0% by mass Since the amount of the component serving as the sintering aid is reduced, there are many portions where the sintering aid does not reach the grain boundary of the alumina crystal phase, and the alumina crystal phase itself is likely to grow. Even in this case, the mechanical strength is lowered.
- the mechanical strength tends to decrease because the ratio of the alumina crystal phase, which is a high-strength material, in the ceramic material is reduced.
- the mechanical strength of the alumina ceramic decreases.
- the mechanical strength decreases because the alumina crystal phase is atomized and the specific surface area is increased, and therefore the alumina crystal phase is increased by the grain boundary of the alumina crystal phase. This is probably because there are parts where auxiliary agents such as manganese oxide and silicon oxide do not reach.
- the mechanical strength decreases when the average grain size of the alumina crystal phase is larger than 1.5 ⁇ m.
- the mechanical strength of ceramics tends to decrease as the size of the fracture source increases. This is considered to be because the size of the fracture source that is generated when a load is applied increases as the average particle size increases.
- the proportion of the crystal phase contained in the alumina ceramic is determined by performing X-ray diffraction on a powdered sample obtained by pulverizing the alumina ceramic, and Rietveld analysis on the obtained X-ray diffraction pattern. To determine the mass ratio of each crystal phase.
- the content of each component contained in the alumina ceramic is determined by atomic absorption analysis and ICP (Inductively Coupled Plasma) analysis.
- ICP Inductively Coupled Plasma
- the obtained alumina ceramics are dissolved in an acidic solution, and the elements contained in the alumina ceramics are qualitatively analyzed by atomic absorption analysis, and then the standard solution is prepared by diluting the standard solution for each specified element. As described above, it is quantified by ICP emission spectroscopic analysis. The amount of oxygen is obtained based on the valence of each element shown in the periodic table.
- the average grain size of the alumina crystal phase is obtained by taking a photograph of 1000 to 5000 times using a scanning electron microscope on a polished surface obtained by polishing a cross section of an alumina ceramic sample, and then obtaining the photograph by the intercept method. .
- the void area ratio After the surface of the alumina ceramics is mirror-polished, the total area of voids (open pores) recognized within the predetermined area as the observation range is obtained by using an image analysis apparatus, and the predetermined void area is determined. Obtained as a percentage of the area.
- the alumina ceramic of the present embodiment has a mechanical structure because it has a crystal structure that suppresses generation of a crystal phase other than the alumina crystal phase even if it contains a considerable amount of additive components such as manganese and silicon.
- the composition formulas of manganese and silicon are Mn 2 O 3 and SiO 2 , respectively, it is expressed by Mn 2 O 3 / (Mn 2 O 3 + SiO 2 )
- the mass ratio is 30 to 50%, and magnesium and molybdenum are further included.
- the magnesium content is 0.3 to 0.7% by mass in terms of MgO, and the molybdenum content is 0.3 to 0 in terms of MoO.
- the void ratio is 3.0% or less and the mechanical strength (3-point bending strength) of the alumina ceramic is 700 MPa or less. It can be.
- alumina ceramics of this configuration are adjusted to the composition of magnesium and molybdenum in addition to manganese and silicon, there is no color unevenness (including porcelain spots) and the appearance and design are beautiful ceramics. Can be.
- the metallized layer is formed on the surface of the alumina ceramic having this structure as an insulating substrate as described later, the metallized strength can be increased.
- the ratio of the crystal phase mainly composed of aluminum oxide contained in the alumina ceramic is preferably 99.2 to 99.9% by mass.
- the alumina ceramic of the present embodiment is excellent in mechanical properties, and thus is suitable as an insulating substrate for various ceramic wiring boards and ceramic packages.
- the metallized strength can be 43 N (kg ⁇ m / s 2 ) or more, particularly 51 N (kg ⁇ m / s 2 ) or more. This is because the amorphous phase of oxide containing manganese and silicon surrounding the alumina crystal phase has good wettability to the metallized layer (metal powder sintered body) side formed on the surface of the alumina ceramics. This is to penetrate.
- FIG. 1 is an exploded perspective view showing an embodiment of the ceramic package of the present invention.
- the ceramic package of the present embodiment has a metallized layer 3 arranged circumferentially on the surface of an insulating substrate 1 made of ceramic. On the upper surface of the metallized layer 3 arranged circumferentially, A joining member 7 for joining the metal member 5 such as a lid or a metal frame to the metallized layer 3 is provided.
- the insulating substrate 1 includes a plate-like substrate bottom portion 1a and a substrate bank portion 1b provided at the peripheral edge of the substrate bottom portion 1a, and the electronic component 9 is mounted on the surface of the substrate bottom portion 1a.
- a conductor 11 is formed.
- This ceramic package is obtained by applying the high-strength alumina ceramic of the present embodiment to the substrate bottom 1a and the substrate bank 1b, which are insulating substrates.
- the substrate bottom 1a even by reducing the width w 0 of the thickness t and the substrate bank portion 1b of the can suppress the deformation of the substrate bottom 1a and the substrate bank portion 1b which occurs when bonding the metal member 5 is the lid, the occurrence of cracks Can be prevented.
- a thin ceramic package in which the average thickness of the substrate bottom 1a is 0.05 to 0.3 mm, particularly 0.05 to 0.2 mm, and the average thickness of the substrate bank 1b is 0.15 mm or less. It is suitable for.
- the material for forming the metallized layer 3 may be a metal material having a melting point higher than that of the material used for the bonding member 7. Molybdenum, tungsten, or an alloy thereof is used in view of enabling simultaneous firing with the ceramic substrate 1.
- the main component is good. In this case, copper or silver may be combined with molybdenum or tungsten according to the composition of the insulating substrate 1 and the sintering temperature.
- the ceramic component included in the metallized layer 3 is a ceramic material having a high melting point that does not melt in the temperature range where the metal material of the metallized layer 3 is sintered and remains in the metallized layer 3 after sintering.
- a ceramic material having a high melting point that does not melt in the temperature range where the metal material of the metallized layer 3 is sintered and remains in the metallized layer 3 after sintering.
- oxides of alumina, zirconia, magnesia, and rare earth elements are suitable, but the main component of the insulating substrate 1 is that the strength of the metallized layer 3 mainly composed of molybdenum, tungsten, or the like can be increased.
- Aluminum oxide (alumina) is preferred. It is desirable that the conductor 11 has the same composition.
- the bonding member 7 is preferably a material which melts at a relatively low temperature (here, 900 ° C. or less) when heated and has a low viscosity and easily diffuses into the metallized layer 3.
- a relatively low temperature here, 900 ° C. or less
- silver brazing Al—Cu And materials containing a low melting point metal such as wood metal.
- a metal material such as Kovar, 4-2 alloy, Alsic (ALSiC) and the like, a composite of ceramics with a metal material, or a ceramic material can be applied.
- alumina powder aluminum oxide powder
- manganese oxide powder Mn 2 O 3 powder
- silicon oxide powder SiO 2 powder
- a plate-shaped raw molded body is formed by a known molding method such as a press method, a doctor blade method, a rolling method, or an injection method.
- the ratio of Mn 2 O 3 powder and SiO 2 powder is 30 to 50% in terms of Mn 2 O 3 / (Mn 2 O 3 + SiO 2 ) ratio (mass ratio)
- the average particle size of the alumina powder, Mn 2 O 3 powder and SiO 2 powder used here is preferably in the range of 0.3 to 1.0 ⁇ m, whereby the alumina crystal phase in the alumina ceramics after firing is good.
- the average particle size of the glass can be 0.8 to 1.5 ⁇ m, and precipitation of crystal phases other than the alumina crystal phase can be suppressed at the grain boundaries of the alumina crystal phase.
- a conductor pattern is formed on the surface of the green molded body as necessary, and then fired at a temperature of 1300 to 1600 ° C. in a reducing atmosphere, for example.
- a green sheet is produced as a raw molded body that becomes the substrate bottom 1a, and then a conductor pattern is formed on the surface thereof.
- the green molded body to be the substrate bank portion 1b is prepared by subjecting a green sheet to hole processing and then partially forming a conductor pattern on the surface around the hole of the green sheet. At this time, a sheet that has only been subjected to drilling is prepared as necessary.
- the green sheet with the conductor pattern formed on the surface around the hole is laminated on the surface on which the conductor pattern of the green sheet, which will be the substrate bottom 1a, is formed and adhered to form a ceramic package for the shape shown in FIG. Form the body.
- the paste for the conductor pattern it is possible to use metal materials having various compositions in accordance with the sintering temperature of the ceramic powder.
- a ceramic powder containing 80% by mass or more of alumina powder in a raw molded body it is preferable to use a metal material having a high melting point such as molybdenum or tungsten.
- a nickel plating film is formed on the surface of the metallized layer 3 of the obtained ceramic package, and a metal such as a lid or a metal frame is formed on the surface of the metallized layer 3 on which the nickel plating film is formed via a bonding member 7.
- the member 5 is joined.
- the ceramic package having the metal member 5 manufactured in this way has high mechanical strength of the insulating substrate 1 and high bonding strength between the metallized layer 3 and the metal member 5 through the bonding member 7, and appearance. There is no defect, and when the lid is bonded to the insulating substrate 1, it can be made highly airtight.
- alumina powder, Mn 2 O 3 powder, SiO 2 powder, MgO powder, and MoO 3 powder having an average particle diameter of 0.5 ⁇ m were prepared as raw material powders for producing alumina ceramics.
- an acrylic binder is used as a molding organic resin (binder), and toluene is used as a solvent to prepare a slurry. Thereafter, a doctor blade method is used. A green sheet having a predetermined thickness was prepared.
- the obtained green sheets were laminated to a predetermined thickness, and a conductor pattern mainly composed of the metal shown in Table 1 was printed as necessary, and fired at the temperature shown in Table 1.
- a nitrogen-hydrogen mixed atmosphere with a dew point of + 25 ° C. was used.
- the ratio of each crystal phase was obtained by grinding the obtained alumina ceramics, identifying the main crystal phase by X-ray diffraction, and conducting Rietveld analysis.
- the average grain size of the alumina crystal phase is determined by taking an approximately 3000-fold photograph using a scanning electron microscope on the polished surface obtained by polishing the cross section of the sample of the alumina ceramics, and then using this photograph by the intercept method. Asked.
- the surface of the alumina ceramics is mirror-polished with an abrasive, and the total area of voids (open pores) recognized within a predetermined area is obtained using an image analyzer (LUZEX-FS manufactured by Nireco). It was determined as a ratio to a predetermined area. At this time, the microscope magnification was about 100 times, and the measurement area was 9.0 ⁇ 10 4 ⁇ m 2 .
- the mechanical strength was obtained by preparing a beam-like sample having a thickness of 3 mm, a width of 4 mm, and a length of 40 mm, measuring it as a three-point bending strength at room temperature based on JIS R1601, and calculating an average value of 35 pieces.
- a conductor pattern is formed on a green sheet so as to have a size of 2 mm ⁇ 20 mm after firing, fired by the same method as described above, and then Ni-plated, to which a eutectic Ag—Cu brazing material is applied.
- the lead pin made of Fe—Ni—Co was bonded to the metal and the load when it was pulled up and peeled off at a speed of 20 mm / min was evaluated as the metallization strength.
- composition of the prepared sample was determined by atomic absorption analysis and ICP analysis.
- the obtained alumina ceramics are dissolved in an acidic solution, and the elements contained in the alumina ceramics are qualitatively analyzed by atomic absorption analysis, and then the standard solution is prepared by diluting the standard solution for each specified element.
- the amount of oxygen was determined based on the valence of each element shown in the periodic table. All the compositions of the samples corresponded to the preparation compositions shown in Table 1.
- aluminum oxide is the main component
- manganese is 2.0 to 5.0 mass% in terms of Mn 2 O 3
- silicon is 3.0 to 7.5 mass% in terms of SiO 2.
- the ratio of the crystal phase mainly composed of aluminum oxide determined by Rietveld analysis of X-ray diffraction is 99.0 to 99.9% by mass
- the average grain size of the alumina crystal phase is 0.8 to 1
- Sample No. 5 having a void area ratio of 3.1% or less per unit area. 1 to 4, 6 to 8, 10 to 17, 18 and 19 all had a three-point bending strength of 680 MPa or more.
- the mass ratio represented by Mn 2 O 3 / (Mn 2 O 3 + SiO 2 ) is 30 to 50%
- Magnesium and molybdenum magnesium is 0.3 to 0.7% by mass in terms of MgO
- molybdenum is 0.3 to 0.7% by mass in terms of MoO
- the void fraction is 3.0% or less
- these samples all had a metallization strength of 51 N or more, and had a good appearance without color unevenness or plating adhesion on the surface of the sample.
Abstract
Description
ことを特徴とする。
1a、101a・・・・・・・・基板底部
1b、101b・・・・・・・・基板堤部
3、103・・・・・・・・・・メタライズ層
5、105・・・・・・・・・・金属部材(蓋体)
7、107・・・・・・・・・・接合部材
9、109・・・・・・・・・・電子部品
11、102・・・・・・・・・導体
Claims (5)
- 酸化アルミニウムを主成分とし、マンガンをMn2O3換算で2.0~5.0質量%およびケイ素をSiO2換算で3.0~7.5質量%含み、
X線回折のリートベルト解析により求められる前記酸化アルミニウムを主成分とする結晶相の割合が99.0~99.9質量%であるとともに、
前記結晶相の平均粒径が0.8~1.5μmであり、
かつ単位面積当たりのボイドの面積割合が3.1%以下である
ことを特徴とするアルミナ質セラミックス。 - 前記マンガンおよび前記ケイ素の組成式をそれぞれMn2O3およびSiO2としたときに、Mn2O3/(Mn2O3+SiO2)で表される質量比率が30~50%であり、
さらに、マグネシウムおよびモリブデンを含み、
前記マグネシウムがMgO換算で0.3~0.7質量%、
前記モリブデンがMoO換算で0.3~0.7質量%であるとともに、
前記ボイドの面積割合が3.0%以下である
ことを特徴とする請求項1に記載のアルミナ質セラミックス。 - 前記酸化アルミニウムを主成分とする結晶相の割合が99.2~99.9質量%であるとともに、Mn2O3/(Mn2O3+SiO2)で表される前記質量比率が30~40%であることを特徴とする請求項2に記載のアルミナ質セラミックス。
- 絶縁基板の表面にメタライズ層を有してなるセラミック配線基板であって、前記絶縁基板が請求項1乃至3のうちいずれかに記載のアルミナ質セラミックスにより構成されていることを特徴とするセラミック配線基板。
- 絶縁基板の表面に接合部材を介して金属部材が接合されてなるセラミックパッケージであって、前記絶縁基板が請求項1乃至3のうちいずれかに記載のアルミナ質セラミックスにより構成されていることを特徴とするセラミックパッケージ。
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JP2016204247A (ja) * | 2015-04-16 | 2016-12-08 | サムソン エレクトロ−メカニックス カンパニーリミテッド. | セラミックパッケージのための絶縁体組成物及びその製造方法 |
JP2017218368A (ja) * | 2016-06-07 | 2017-12-14 | サムソン エレクトロ−メカニックス カンパニーリミテッド. | 絶縁体組成物及びこれを用いた電子部品の製造方法 |
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