WO2012060341A1 - 電子部品素子収納用パッケージ - Google Patents
電子部品素子収納用パッケージ Download PDFInfo
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- WO2012060341A1 WO2012060341A1 PCT/JP2011/075109 JP2011075109W WO2012060341A1 WO 2012060341 A1 WO2012060341 A1 WO 2012060341A1 JP 2011075109 W JP2011075109 W JP 2011075109W WO 2012060341 A1 WO2012060341 A1 WO 2012060341A1
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- ceramic
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- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
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Definitions
- the present invention relates to a multilayer ceramic type electronic component element storage package for mounting and storing an electronic component element such as a semiconductor element, a crystal resonator, or a light emitting element, and more particularly, an electronic component element is packaged.
- the present invention relates to a small and low-profile electronic component element storage package that can reduce the thickness and thickness of a ceramic substrate to accommodate the reduction in size and thickness of a device in which the device is mounted.
- a multilayer ceramic type electronic component element housing package is made of about 91 to 94 wt% of alumina (Al 2 O 3 ) powder and sintered with silica (SiO 2 ), magnesia (MgO), calcia (CaO) or the like.
- SiO 2 silica
- MgO magnesia
- CaO calcia
- Each ceramic green sheet is screen-printed with a conductive paste obtained by kneading refractory metal such as tungsten (W) or molybdenum (Mo) with a solvent to form an electrically conductive state between upper and lower layers.
- the metalized printed wiring for electrical conduction including the via conductors and through-hole conductors is formed.
- a plurality of ceramic green sheets on which metallized printed wiring is formed are stacked and laminated by applying temperature and pressure, and this is laminated at a high temperature of about 1550 to 1600 ° C. in a reducing atmosphere with a high melting point.
- a multilayer ceramic type electronic component element storage package is provided in which metal is simultaneously fired to provide a metallized layer on the surface, inside, or between layers of a ceramic substrate.
- the original sintering temperature of alumina is 1700 ° C. or higher, and a sintering aid is added to lower the sintering temperature. It is possible to conclude.
- the ceramic composition of the ceramic substrate is made of 9-9 wt% silica (SiO 2 ), calcia (CaO), magnesia (MgO), etc., except for 91-94 wt% alumina powder. It is composed of a sintering aid, and the bonding strength of the metallized layer made of tungsten or molybdenum formed on the ceramic substrate can be strengthened by the glass component of the sintering aid.
- the electronic component element storage package made of only alumina described above contains a relatively large amount of sintering aid of 6 to 9 wt% and can lower the firing temperature, but the bending strength of the ceramic substrate itself is as low as about 320 MPa. Therefore, there is a limit to reducing the thickness of the ceramic substrate. Therefore, when the thickness of the ceramic substrate is reduced, the electronic component element storage package cannot withstand the thermal stress at the time of joining the metal lid after mounting the electronic component.
- Such an electronic component element storage package is made into a small, thin and low-profile package that can be mounted on a device capable of handling lightness, thinness and miniaturization after the electronic component is stored with increasing thickness. I can't do that.
- At least one of the ceramic base and the lid is a sintered body containing 2.0 to 27.0 wt% of zirconium oxide in alumina. What was formed is disclosed (for example, refer to Patent Document 1). According to this, the container composed of the ceramic base and the lid is hermetically sealed even if an external force is applied to the ceramic base or the lid after the semiconductor element is hermetically sealed inside the container to form a semiconductor device. Can be kept complete.
- a ceramic base with improved bending strength for a semiconductor device is made of a fired body in which alumina is the main component and zirconia is added to the ceramic base.
- the material composition of the ceramic base is 70 to 90 wt% alumina,
- the addition amount is selected in the range of 10 to 30 wt% (see, for example, Patent Document 2). According to this, it is said that the ceramic substrate has higher bending strength and flexibility (toughness) than that of a single alumina, and the ceramic substrate can be made thinner.
- a package for storing an electronic component element as disclosed in JP-A-6-13481 has a low melting point for sealing by sandwiching a lead terminal between a ceramic base on which the electronic component element is mounted and a lid. It is bonded with glass and is completely different from a package having a laminated structure in which a metallized layer is simultaneously fired in a reducing atmosphere on a ceramic substrate.
- the ceramic substrate and the lid is made of alumina containing zirconia.
- An electronic component element storage package as disclosed in Japanese Patent Application Laid-Open No. 7-38014 is obtained by bonding a copper plate corresponding to a metallized layer to a ceramic substrate by a direct bonding method using the melting point of copper. It is completely different from a package having a laminated structure in which a metallized layer is simultaneously fired in a reducing atmosphere on a substrate.
- At least one of a ceramic substrate and a lid is made of a sintered body of alumina containing zirconia to provide a bending strength. Even if it can be improved, it is impossible to obtain a package that has both the improvement of the bending strength of the ceramic substrate and the securing of the metallized bonding strength of the metallized layer provided on the ceramic substrate.
- the present invention has been made in view of such circumstances, and can improve the bending strength of a ceramic substrate, and can secure the metalized bonding strength of a metallized layer formed by simultaneous firing on the ceramic substrate.
- the purpose is to provide. It is another object of the present invention to provide an electronic component element housing package having high visible light reflectivity on the surface of a ceramic substrate in addition to the above effects.
- an electronic component element storage package comprises a ceramic base for storing an electronic component element, and a metallization for forming an electrically conductive state bonded to the ceramic base.
- the ceramic composition of the ceramic substrate is made of alumina (Al 2 O 3 ) and yttria (Y 2 O 3 ) as a solid solution.
- Partially stabilized zirconia (Y 2 O 3 —ZrO 2 ) and a sintering aid are included, and the sintering aid includes silica (SiO 2 ), calcia (CaO), manganese oxide (MnO, MnO 2 , at least one member selected from Mn 2 O 3, Mn 3 O 4), magnesia (MgO), a combination of, partially stabilized zirconia in the ceramic composition Is within the range of 10-30 wt%, the content of the sintering aid in the ceramic composition is within the range of 1.5-4.5 wt%, and the partially stabilized zirconia, fired in the ceramic composition
- the balance other than the binder is alumina, and the metallized composition of the metallized layer contains a ceramic component composed of tungsten (W), molybdenum (Mo), alumina, and glass.
- the tungsten content in the metallized composition is in the range of 70 to 94 wt%
- the molybdenum content in the metallized composition is in the range of 3 to 20 wt%
- the ceramic component content in the metallized composition is 3 to 20 wt%.
- the ratio of the tetragonal crystal in the zirconia crystal of the ceramic substrate after co-firing is 60% or more.
- the electronic component element storage package according to claim 2 is the electronic component element storage package according to claim 1, wherein the bending strength of the ceramic base body after co-firing is 550 MPa or more.
- the bonding strength between the ceramic substrate and the metallized layer is 25 MPa or more.
- the electronic component element storage package according to claim 3 is the electronic component element storage package according to claim 1, wherein the glass is made of silica (SiO 2 ), magnesia (MgO), calcia (CaO), It is at least one selected from titanium oxide (TiO 2 ), and the glass content in the ceramic component is in the range of 5 to 10 wt%.
- the glass is made of silica (SiO 2 ), magnesia (MgO), calcia (CaO), It is at least one selected from titanium oxide (TiO 2 ), and the glass content in the ceramic component is in the range of 5 to 10 wt%.
- the electronic component element storage package according to claim 4 is the electronic component element storage package according to claim 1, wherein the glass is made of silica (SiO 2 ), magnesia (MgO), calcia (CaO), It is at least one selected from titanium oxide (TiO 2 ), the glass content in the ceramic component is in the range of 5 to 10 wt%, and the molar fraction of yttria in the partially stabilized zirconia is 0.015. It is characterized by being in the range of ⁇ 0.035.
- the ceramic composition of the ceramic base is 10-30 wt% of partially stabilized zirconia (Y 2 O 3 —ZrO 2 ) in which yttria is dissolved.
- Sintering aid comprising a combination of at least one selected from silica, (SiO 2 ), calcia (CaO), manganese oxide (MnO, MnO 2 , Mn 2 O 3 , Mn 3 O 4 ) and magnesia (MgO) 1.5 to 4.5 wt% of the agent and alumina (Al 2 O 3 ) in the balance, and the metallized composition of the metallized layer contains 70 to 94 wt% of tungsten (W) and molybdenum (Mo).
- the ceramic substrate Containing 3 to 20 wt% of a ceramic component comprising 3 to 20 wt% of alumina and glass, and zirconia bonding of the ceramic substrate after co-firing.
- the bending strength of the ceramic substrate after co-firing can be made 550 MPa or more, and the bonding strength between the ceramic substrate and the metallized layer after co-firing can be made 25 MPa or more. it can.
- the ceramic substrate (ceramic substrate according to any one of claims 1 to 4) fired by containing a sintering aid in alumina and partially stabilized zirconia in which yttria is dissolved is sintered into alumina.
- a higher bending strength can be obtained than in the case of a ceramic substrate made of alumina alone fired by containing an agent.
- a ceramic substrate containing high-stiffness, high-toughness partially stabilized zirconia in which yttria is dissolved is a part of tetragonal zirconia at the time of fracture by keeping the proportion of tetragonal crystals in the zirconia crystal at 60% or more. Can be transformed into monoclinic zirconia, causing volume expansion to absorb fracture energy and increasing material strength.
- the ceramic substrate can further improve the bending strength of the ceramic substrate by increasing the content of partially stabilized zirconia in which yttria is dissolved, but the content of zirconia, which has a lower thermal conductivity than alumina, is larger. This is not preferable because the thermal conductivity of the ceramic substrate is lowered. Therefore, in the inventions according to claims 1 to 4, the bending strength of 550 MPa or more, which is higher than that of alumina alone, is obtained by setting the content of the partially stabilized zirconia in the ceramic composition within the range of 10 to 30 wt%. While maintaining the above, it is possible to maintain a thermal conductivity equivalent to that of alumina alone.
- the electronic component element storage package according to any one of claims 1 to 4 contains magnesia as an essential component as a sintering aid in the ceramic composition of the ceramic substrate, and in addition, selected from silica, calcia, and manganese oxide.
- magnesia as an essential component as a sintering aid in the ceramic composition of the ceramic substrate, and in addition, selected from silica, calcia, and manganese oxide.
- the content of the sintering aid (a combination of at least one selected from silica, calcia, and manganese oxide and magnesia) for forming the ceramic substrate is excessively increased, the bending strength of the ceramic substrate itself is lowered. If the amount is too small, the bonding strength with the metallized layer is lowered, which is not preferable. For this reason, in the inventions according to claims 1 to 4, by setting the content of the sintering aid in the ceramic composition within the range of 1.5 to 4.5 wt%, the high bending strength of the ceramic substrate itself is obtained. In addition, high bonding strength between the ceramic substrate and the metallized layer can be ensured at the same time.
- the sintering aid a combination of at least one selected from silica, calcia, and manganese oxide and magnesia
- the electronic component element storage package according to any one of claims 1 to 4 is a combination of an appropriate amount of tungsten and molybdenum in the metallized composition of the metallized layer so that the ceramic substrate and the metallized material are mixed.
- the firing temperature range at the time of simultaneous firing in a reducing atmosphere of the layers can be expanded.
- the sintering start temperature of the metallized layer can be lowered, and the shrinkage timing of the metallized layer can be matched with the shrinkage timing of the ceramic. It is possible to produce a ceramic substrate having a metallized layer that suppresses the occurrence of.
- the above-mentioned electronic component element storage package has a high reflectivity due to the high refractive index of zirconia itself, without adding a color developing agent such as molybdic acid to be mixed in order to color the ceramic base in black.
- a white ceramic substrate can also be obtained. Therefore, the ceramic substrate can be used as a light emitting element storage package that can improve the reflectance of light emitted from a light emitting element such as an LED (Light Emitting Diode), and can improve the light emission efficiency.
- FIG. 1 is an explanatory view of an electronic component element storage package according to an embodiment of the present invention.
- an electronic component element storage package 10 according to an embodiment of the present invention includes a ceramic base 11 and a metallized layer 12 provided to be joined to the ceramic base 11.
- an electronic component element 13 such as a semiconductor element, a crystal resonator, or a light emitting element is mounted on a ceramic base 11, and the electronic component element 13 is hermetically sealed with a lid 14. It is used for.
- This electronic component element storage package 10 was prepared by forming a slurry obtained by adding an organic binder, a plasticizer, a solvent, etc. to a ceramic composition and kneading it into a sheet shape by, for example, a doctor blade method in order to create a ceramic substrate 11.
- a plurality of ceramic green sheets are used.
- via conductor printing is used for screen printing using a conductive paste, and for the metallization layer 12 for electrical conduction including via conductors and through-hole conductors for forming an electrical conduction state between the upper and lower layers.
- the printed wiring is formed.
- the plurality of ceramic green sheets on which the printed wiring is formed are stacked and laminated with application of temperature and pressure, and then the ceramic green sheet and the printed wiring are simultaneously fired in a reducing atmosphere to thereby surface the ceramic substrate 11.
- it is formed in a multilayer ceramic type electronic component element storage package 10 provided by bonding a metallized layer 12 inside or between layers.
- the ceramic composition of the ceramic substrate 11 constituting the electronic component element storage package 10 is composed of alumina, partially stabilized zirconia in which yttria is dissolved, and a sintering aid.
- the electronic component element storage package 10 contains 10 to 30 wt% of partially stabilized zirconia in which yttria as described above is dissolved in the ceramic composition of the ceramic substrate 11.
- This partially stabilized zirconia itself has extremely excellent characteristics such as high strength and high toughness.
- partially stabilized zirconia can improve the bending strength of the ceramic base
- the electronic component element storage package 10 can be obtained from the conventional alumina alone by setting the content of the partially stabilized zirconia in the ceramic composition of the ceramic substrate 11 within the range of 10 to 30 wt%.
- the thermal conductivity is comparable to that of a ceramic substrate made only of conventional alumina. Can have a rate (15 W / mK).
- the content of the partially stabilized zirconia is less than 10 wt%, the effect of improving the strength after firing is insufficient and only an average bending strength of about 400 MPa can be obtained. Further, when the content of the partially stabilized zirconia exceeds 30 wt%, the heat conductivity is 12 W / mK or less, and heat generated from the electronic component element 13 is quickly radiated to the outside via the ceramic substrate 11. Can not be. Even when the electronic component element 13 is hermetically sealed by seam welding or the like using the metal lid 14, the ceramic base 11 has a high bending resistance due to the thermal shock resistance against high heat generated during sealing. It is necessary to have high thermal conductivity as well as strength.
- the bending strength of the ceramic substrate 11 is not improved significantly even if the content of partially stabilized zirconia exceeds 30 wt%.
- the partially stabilized zirconia in which yttria is dissolved is preferably produced by a coprecipitation method which is one of the methods for producing powder.
- a coprecipitation method an alkali is added to a solution containing two or more kinds of metal ions, and an ion concentration product in the solution is brought into a supersaturated state where the solubility product is higher than the solubility product.
- This is a method in which a powder that can be precipitated at the same time and has high uniformity can be prepared, and may exhibit characteristics that cannot be obtained by simply crushing and mixing a solid sample.
- the electronic component element storage package 10 is a combination of magnesia and at least one selected from silica, calcia, and manganese oxide as a sintering aid in the ceramic composition of the ceramic substrate 11. Containing 0.5 to 4.5 wt%.
- a ceramic substrate 11 can be made into a dense fired body by reducing the firing temperature to about 1450 to 1600 ° C. by including partially stabilized zirconia and magnesia in the ceramic composition. Conductivity can be increased. Furthermore, the lowering of the firing temperature can suppress the growth of zirconia crystal particles and increase the bonding strength between the metallized layer 12 and the ceramic substrate 11.
- the content of magnesia in the ceramic composition is less than 0.05 wt%, it is difficult to lower the firing temperature, and it becomes impossible to suppress the growth of zirconia crystal particles in the ceramic substrate 11. As a result, a dense fired body cannot be obtained. Further, when the content of magnesia in the ceramic composition exceeds 1 wt%, the bending strength of the ceramic substrate 11 is lowered, although no change is observed in the sinterability. Further, by adding a sintering aid containing magnesia as an essential component and containing at least one selected from silica, calcia, and manganese oxide to the ceramic composition, the vitreous material in the ceramic substrate 11 is converted into a metallized layer 12 by capillary action.
- the adhesion strength between the ceramic substrate 11 and the metallized layer 12 can be improved by the vitreous physical anchor effect.
- the content of the sintering aid in the ceramic composition is less than 1.5 wt%, the amount of movement from the ceramic substrate 11 to the vitreous metallized layer 12 is insufficient, and the ceramic substrate 11 and the metallized layer The bonding strength with 12 decreases.
- content of the sintering auxiliary agent in a ceramic composition exceeds 4.5 wt%, the glassy substance in the ceramic base
- manganese oxide which is a sintering aid a case where manganese oxide having a chemical formula of Mn 2 O 3 is used is exemplified, but this manganese oxide (Mn 2 O 3 ) Instead, use other manganese oxides with different chemical formulas (eg, MnO, MnO 2 , Mn 3 O 4 ) alone or in combination with multiple types of manganese oxides with different chemical formulas as a sintering aid. Is also possible.
- the ceramic composition of the ceramic substrate 11 is composed of 10 to 30 wt% of partially stabilized zirconia and 1.5 to 4.5 wt% of the sintering aid. Contains alumina. Therefore, the content of alumina in the ceramic composition of the ceramic substrate 11 constituting the electronic component element storage package 10 is 88.5 wt% at the maximum and 65.5 wt% at the minimum. If the content of alumina in the ceramic composition of the ceramic substrate 11 is in this range, even if zirconia, which is a low thermal conductivity material, is added, the thermal conductivity of the alumina substrate according to the prior art (alumina: 91-94 wt. %, Sintering aid: ceramic substrate made of a ceramic composition comprising 6 to 9 wt%), and a decrease in the thermal conductivity of the ceramic substrate 11 can be suppressed.
- the metallized composition of the metallized layer 12 formed by bonding to the ceramic substrate 11 contains tungsten, molybdenum, and a ceramic component.
- This metallized composition contains 70 to 94 wt% tungsten, 3 to 20 wt% molybdenum, and 3 to 20 wt% ceramic components.
- a printed wiring is formed on the ceramic green sheet with a screen printer using a conductive paste containing a binder or a solvent in the metallized composition, and this is reduced in a reducing atmosphere. It is formed by simultaneous firing.
- Tungsten and molybdenum in this metallized composition are metals called high melting points (melting point of tungsten: 3407 ° C., melting point of molybdenum: 2620 ° C.), and are conductive metals that can be co-fired with ceramics in a reducing atmosphere. Conventionally, it is generally known.
- the above metallized composition contains an appropriate amount of molybdenum and the fact that the melting point of molybdenum is lower than the melting point of tungsten, only tungsten is used as the conductor metal of the metallized composition (1550 to 1600 ° C.)
- the co-firing temperature range can be lowered and widened (1450 to 1600 ° C.).
- the metallized layer 12 can be co-fired with the ceramic substrate 11 containing partially stabilized zirconia so that the firing temperature can be lowered.
- the metallized composition is composed of a plurality of types of conductive metals so that simultaneous firing in accordance with the content of alumina is possible.
- the firing temperature of the metallized composition is increased by adding molybdenum, so that simultaneous firing is performed without any trouble. It becomes possible. Furthermore, the above metallized composition is obtained by co-firing the metallized composition and the ceramic green sheet, thereby incorporating the glass component in the ceramic composition around the tungsten particles and the molybdenum particles to strengthen the bonding between the particles.
- the metallized layer 12 to be formed can be formed.
- the metallized composition described above is formed by simultaneously firing while sucking up the glass component of the ceramic green sheet by utilizing the wettability of molybdenum with the glass, so that the space between the ceramic substrate 11 and the metallized layer 12 is reduced. It can be joined firmly.
- the metallized composition contains an appropriate amount of a ceramic component, and is fired while supplying a glass component to the ceramic green sheet, thereby improving the bonding strength between the ceramic substrate 11 and the metallized layer 12 after simultaneous firing.
- the metallized composition contains a ceramic component, so that the ceramic substrate 11 and the metallized layer that are generated due to a shrinkage difference at the time of simultaneous firing of the printed wiring for via filling the through hole formed in the ceramic green sheet with the conductive paste. 12 can be prevented from peeling off.
- the firing shrinkage start timing of the metallized layer 12 is brought closer to the ceramic, and the firing shrinkage timing time amount of the ceramic substrate 11 and the metallized layer 12 is matched. Warpage generation of the ceramic substrate 11 provided with the metallized layer 12 can be suppressed.
- the ceramic component is composed of a combination of at least one glass selected from silica (SiO 2 ), magnesia (MgO), calcia (CaO), and titanium oxide (TiO 2 ) and alumina.
- the glass content in the ceramic component is preferably in the range of 5 to 10 wt%.
- the metallized composition can ensure electrical conductivity by making the conductive metal, which is a combination of tungsten and molybdenum having relatively low electrical conductivity, at least 80 wt%.
- the conductive metal which is a combination of tungsten and molybdenum having relatively low electrical conductivity, at least 80 wt%.
- the molybdenum content exceeds 20 wt%, the firing temperature is excessively lowered, and simultaneous firing with the ceramic green sheet becomes difficult.
- the content of tungsten exceeds 94 wt%, the content of at least one of molybdenum and the ceramic component falls below 3 wt%.
- the molybdenum content is less than 3 wt%, it is difficult to lower the firing temperature, and simultaneous firing with the ceramic green sheet becomes impossible.
- the content of the ceramic component is less than 3 wt%, the effect of adjusting the firing shrinkage timing at the time of simultaneous firing is reduced, and the ceramic substrate 11 provided with the metallized layer 12 is likely to be warped. Further, when the content of the ceramic component is less than 3 wt%, the amount of the glass component in the metallized layer 12 is insufficient, the anchor effect to the ceramic substrate 11 is reduced, and the bonding strength is reduced. On the other hand, when the content of the ceramic component exceeds 20 wt%, the amount of the glass component increases too much, and conversely, the internal strength of the metallized layer 12 itself decreases or the electrical resistance value as a conductor increases. Or the adhesion strength with the plating film is reduced.
- the electronic component element storage package 10 described above has a ratio of tetragonal crystals in the zirconia crystals of the ceramic substrate 11 after simultaneous firing of 60% or more.
- Zirconium oxide (ZrO 2 ) itself constituting the partially stabilized zirconia contained in the ceramic substrate 11 has high heat resistance, low vapor pressure at high temperature, good chemical corrosion resistance, and thermal conductivity compared to alumina. It has characteristics such as a single digit lower and is excellent as a high temperature heat resistant material.
- zirconium oxide has three transformations of monoclinic, tetragonal, and cubic. Especially, the phase transformation of monoclinic and tetragonal crystals involves a large volume change. It cannot be used as a heat resistant material.
- zirconium oxide is a stabilized zirconia in which a low-valent oxide yttria (Y 2 O 3 ) or the like is solid-dissolved, and the highest temperature phase, a meteorite-type cubic crystal, exists as a stable phase up to a low temperature. Can be formed.
- the amount of yttria required for 100% cubic stabilized zirconia is about 6 mol%, but this is small, for example, by adding about 3 mol%, more specifically, partially stabilized zirconia.
- the electronic component element storage package 10 comprising the ceramic substrate 11 containing the partially stabilized zirconia in which yttria containing 60% or more of the tetragonal crystal in the zirconia crystal is dissolved can have high bending strength and high toughness. It has the outstanding characteristic that can be improved.
- the ceramic base 11 constituting the electronic component element storage package 10 can be thinned, so that the electronic component element storage package 10 can be made into a package that can cope with an extremely small and low profile.
- the proportion of tetragonal crystals in the zirconia crystal constituting the ceramic substrate 11 is less than 60%, the bending strength of the electronic component element storage package made of the ceramic substrate 11 containing the ceramic substrate 11 is lowered and the toughness is increased. And the production of a thin ceramic substrate becomes difficult.
- the electronic component element storage package 10 described above has a bending strength of the ceramic substrate 11 after simultaneous firing of 550 MPa or more.
- the electronic component element storage package 10 having a bending strength of 550 MPa or more can be obtained by sealing the electronic component element 13 mounted on the ceramic substrate 11 while pressing it with a metal lid 14 by seam welding or the like. 11 can be joined without causing cracks or breakage. This bending strength is measured by the test method of JIS R 1601. Therefore, the ceramic substrate 11 can provide the electronic component element storage package 10 having a thickness smaller than that of the conventional ceramic substrate, and can cope with a reduction in the size and height of the package and the electronic device incorporating the package. .
- the electronic component element storage package 10 described above has a bonding strength of 25 MPa or more between the ceramic substrate 11 and the metallized layer 12 after simultaneous firing.
- An electronic component element storage package 10 having a bonding strength between the ceramic substrate 11 and the metallized layer 12 of 25 MPa or more is a wire bond pad 16 for electrically connecting the electronic component element 13 and the bonding wire 15;
- Each of the metallized layers 12 such as the seal pad 17 for bonding the lid body 14 and the external connection terminal pad 18 for electrically connecting to the outside through solder bonding is formed without causing metallization peeling. Can be joined.
- the bonding strength was measured by brazing a metal lead terminal bent at a right angle to a metallization layer 12 having a width of 1 mm and pulling the metal lead terminal in the vertical direction, and the metallization layer 12 was peeled off from the surface of the ceramic substrate 11. It is measured by the intensity of the case.
- the inventor of the present invention has various ceramic ratios of 95: 5, 90:10, 80:20, and 70:30 in the composition ratio of the ceramic substrate made of only alumina and the partially stabilized zirconia in which alumina and yttria are dissolved. Samples made of the ceramic substrates were prepared, and the bending strength of each ceramic substrate was measured. Further, a metallized layer composed of 94 wt% tungsten, 3 wt% molybdenum and 3 wt% ceramic component was formed on the various ceramic substrates, and the bonding strength between the ceramic substrate and the metallized layer was measured. Table 1 shows the results.
- the sintering aid in the ceramic composition according to the present invention is an indispensable constituent element for the present invention to exhibit a unique effect.
- the inventor of the present invention sets the composition ratio of the partially stabilized zirconia in which yttria is dissolved in the ceramic composition to 22 wt%, magnesia to 0.5 wt%, and at least selected from silica, calcia, and manganese oxide.
- Various ceramic bases were prepared in which the total content of one kind of sintering aid was 0.5 to 6 wt% and the balance was alumina, and the bending strength of the ceramic base was measured. Further, a metallized layer composed of 94 wt% tungsten, 3 wt% molybdenum and 3 wt% ceramic component was formed on the various ceramic substrates, and the bonding strength between the ceramic substrate and the metallized layer was measured.
- Table 2 shows the results.
- the content of the sintering aid consisting of a combination of at least one selected from silica, calcia, and manganese oxide and magnesia in the ceramic composition is 1.5 to 4.5 wt%. It was confirmed that the example which can secure a bending strength of 550 MPa or more and a bonding strength of the ceramic substrate and the metallized layer of 25 MPa or more.
- the composition ratio of the partially stabilized zirconia in which yttria was solid-solved was 22 wt% and magnesia was only 0.5 wt%, or the yttria was dissolved in the ceramic composition.
- the composition ratio of partially stabilized zirconia is 22 wt%, magnesia is 0.5 wt%, and the total content of at least one sintering aid selected from silica, calcia, and manganese oxide is less than 1.5 wt%.
- the comparative example can secure a bending strength of 550 MPa or more for the ceramic substrate, it can be confirmed that the bonding strength between the ceramic substrate and the metallized layer is less than 10 MPa and the bonding strength of the metallized layer cannot be ensured of 25 MPa or more.
- the composition ratio of partially stabilized zirconia in which yttria is dissolved is 22 wt%, magnesia is 0.5 wt%, and at least one kind of sintering aid selected from silica, calcia, and manganese oxide is used.
- the comparative example in which the total content of the agent exceeds 4.5 wt% can confirm that the bonding strength between the ceramic substrate and the metallized layer can be secured at 25 MPa or more, but the bending strength becomes 500 MPa or less and the bending strength of 550 MPa or more cannot be secured. It was.
- the manganese oxide of the sintering aid contained in the ceramic composition was a chemical formula represented by Mn 2 O 3 .
- the content of the sintering aid in the ceramic composition and its component composition are also essential components.
- the ceramic composition 22 wt% of partially stabilized zirconia, 0.5 wt% of magnesia, 1.0 wt% of silica, 0.5 wt% of calcia, and 1.0 wt% of manganese oxide (Mn 2 O 3 ) are used. Then, a sample according to the example in which the balance was alumina was prepared, and the reflectance of blue light having a wavelength of 450 nm, which is expected to be mounted on the electronic component element storage package 10 according to the present embodiment, was measured. The reflectance of was 83%.
- CM-3700d spectrocolorimeter manufactured by Konica Minolta
- the measurement conditions were SCI (including regular reflection) and area ⁇ 8 mm.
- the ceramic composition a sample (comparative example) according to a conventional example in which partially stabilized zirconia is 22 wt%, a sintering aid composed of magnesia, silica, and calcia is 7 wt% and the balance is alumina is prepared.
- the reflectance of blue light having a wavelength of 450 nm was measured under the same conditions, the reflectance of the sample surface was 75%.
- substrate which concerns on the Example used for the measurement of a reflectance, and a prior art example was 1 mm. Therefore, the electronic component element storage package 10 according to the present embodiment has a significantly higher reflectivity on the surface of the ceramic substrate 10 than the conventional example, and the electronic component element mounted on the electronic component element storage package 10.
- the ceramic substrate 10 itself can sufficiently function as a highly reflective material.
- the electronic component element storage package according to the present invention can cope with a small size and a low profile, a semiconductor element corresponding to the small size and a low profile or an electronic component element such as a crystal resonator is mounted on a cavity portion as a mounting portion. After being hermetically sealed with a lid, it can be used by being incorporated into an electronic device such as a personal computer or a mobile phone that is required to be light and thin.
- the electronic component element storage package of the present invention can be used for backlights for various lighting devices, televisions, personal computers, and the like that are mounted with electronic component elements such as light emitting elements and are required to be light and thin. .
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Abstract
Description
(1)特開平6-13481号公報で開示されるような電子部品素子収納用パッケージは、電子部品素子を搭載したセラミック基体と、蓋体とが間にリード端子を挟み込んで封止用低融点ガラスで接合されるもので、セラミック基体にメタライズ層を還元雰囲気中で同時焼成して設ける積層構造からなるパッケージとは全く異なるものであり、例え、セラミック基体及び蓋体の少なくとも一方をジルコニア入りアルミナの焼結体にして曲げ強度を向上できたとしても、セラミック基体の曲げ強度の向上と、セラミック基体に設けるメタライズ層のメタライズ接合強度の確保の両方を併せ持つパッケージを得ることができなくなっている。
(2)特開平7-38014号公報で開示されるような電子部品素子収納用パッケージは、セラミック基体にメタライズ層に相当する銅板を銅の融点を利用する直接接合法で接合するもので、セラミック基体にメタライズ層を還元雰囲気中で同時焼成して設ける積層構造からなるパッケージとは全く異なるものであり、例え、セラミック基体及び蓋体の少なくとも一方をジルコニア入りアルミナの焼結体にして曲げ強度を向上できたとしても、セラミック基体の曲げ強度の向上と、セラミック基体に設けるメタライズ層のメタライズ接合強度の確保の両方を併せ持つパッケージを得ることができなくなっている。
さらに、上記効果に加えてセラミック基体の表面における可視光線の反射率が高い電子部品素子収納用パッケージを提供することを目的とする。
11…セラミック基体
12…メタライズ層
13…電子部品素子
14…蓋体
15…ボンディングワイヤ
16…ワイヤボンドパッド
17…シールパッド
18…外部接続端子パッド
図1は本発明の一実施の形態に係る電子部品素子収納用パッケージの説明図である。
図1に示すように、本発明の一実施の形態に係る電子部品素子収納用パッケージ10は、セラミック基体11と、このセラミック基体11に接合して設けられるメタライズ層12からなっている。この電子部品素子収納用パッケージ10は、セラミック基体11に半導体素子や、水晶振動子や、発光素子等の電子部品素子13を実装し、蓋体14で電子部品素子13を気密に封止するのに用いられている。この電子部品素子収納用パッケージ10は、セラミック基体11を作成するために、セラミック組成物に有機バインダー、可塑剤、溶剤等を加えて混練したスラリーを、例えば、ドクターブレード法でシート状に成形した複数枚のセラミックグリーンシートを用いている。そして、それぞれのセラミックグリーンシートには、導体ペーストを用いてスクリーン印刷で上、下層間の電気的導通状態を形成するためのビア導体や、スルーホール導体を含む電気的導通用のメタライズ層12用の印刷配線を形成している。更に、印刷配線が形成された複数枚のセラミックグリーンシートは、重ね合わせて温度と圧力をかけて積層した後、セラミックグリーンシートと、印刷配線を還元雰囲気中で同時焼成してセラミック基体11の表面や、内部や、層間にメタライズ層12を接合して設ける積層セラミック型の電子部品素子収納用パッケージ10に形成している。
なお、後段においては、焼結助剤である酸化マンガンの一例として、化学式がMn2O3で示される酸化マンガンを用いた場合を例示しているが、この酸化マンガン(Mn2O3)に代えて、化学式の異なる他の酸化マンガン(例えば、MnO、MnO2、Mn3O4)を単独で,あるいは,化学式の異なる複数種類の酸化マンガンを複数種類組み合わせて焼結助剤として利用することも可能である。
更に、上記のメタライズ組成物は、メタライズ組成物と、セラミックグリーンシートを同時焼成することで、タングステン粒子や、モリブデン粒子の周りにセラミック組成物中のガラス成分を取り込んで粒子間の接合を強固にするメタライズ層12を形成できるようにしている。これと共に、上記のメタライズ組成物は、モリブデンのガラスとの濡れ性が優れることを利用して、セラミックグリーンシートのガラス成分を吸い上げながら同時焼成することで、セラミック基体11と、メタライズ層12間を強固に接合できるようにしている。
すなわち、セラミック基体11を形成するセラミック組成物から焼結助剤を除くと、メタライズ層12の接合強度を全く確保できないことが明らかになった。このため、本願発明に係るセラミック組成物における焼結助剤は、本願発明が独自の効果を奏するための必須の構成要素であるといえる。
なお、下記表2に示される各実施例の試料において、セラミック組成物に含有される焼結助剤の酸化マンガンは、化学式がMn2O3で示されるものを使用した。
上述のとおり、本願発明においては、セラミック組成物における焼結助剤の含有量,及び,その成分組成も必須の構成要素であるといえる。
他方、セラミック組成物における、部分安定化ジルコニアを22wt%、マグネシアとシリカとカルシアとからなる焼結助剤を7wt%とし、残部をアルミナとした従来例に係る試料(比較例)を作製して、同条件にて波長450nmの青色光の反射率を測定したところ、試料表面の反射率は75%であった。
なお、反射率の測定のために使用する実施例及び従来例に係るセラミック基体からなる試料の厚みは1mmとした。
従って、本実施の形態に係る電子部品素子収納用パッケージ10は、従来例と比較してセラミック基体10の表面における反射性が大幅に高く、電子部品素子収納用パッケージ10に搭載される電子部品素子が発光素子である場合には、セラミック基体10自体を高反射材としても十分に機能させることができる。
Claims (4)
- 電子部品素子を収納するためのセラミック基体(11)と,前記セラミック基体に接合されて電気的導通状態を形成するためのメタライズ層(12)と,を還元雰囲気中で同時焼成してなる電子部品素子収納用パッケージ(10)において、
前記セラミック基体(11)のセラミック組成物は、アルミナ(Al2O3)と、イットリア(Y2O3)を固溶させた部分安定化ジルコニア(Y2O3-ZrO2)と、焼結助剤と、を含有し、
前記焼結助剤は、シリカ(SiO2),カルシア(CaO),酸化マンガン(MnO,MnO2,Mn2O3,Mn3O4)から選択される少なくとも1種と、マグネシア(MgO)と、の組合せからなり、
前記セラミック組成物における前記部分安定化ジルコニアの含有量は10~30wt%の範囲内であり、
前記セラミック組成物における前記焼結助剤の含有量は1.5~4.5wt%の範囲内であり、
前記セラミック組成物における前記部分安定化ジルコニア, 前記焼結助剤以外の残部は前記アルミナであり、
前記メタライズ層(12)のメタライズ組成物は、タングステン(W)と、モリブデン(Mo)と、アルミナと,ガラスと,からなるセラミック成分と、を含有し、
前記メタライズ組成物における前記タングステンの含有量は70~94wt%の範囲内であり、
前記メタライズ組成物における前記モリブデンの含有量は3~20wt%の範囲内であり、
前記メタライズ組成物における前記セラミック成分の含有量は3~20wt%の範囲内であり、
同時焼成後の前記セラミック基体(11)のジルコニア結晶内の正方晶の割合は60%以上であることを特徴とする電子部品素子収納用パッケージ(10)。 - 同時焼成後の前記セラミック基体(11)の曲げ強度は550MPa以上であり、
同時焼成後の前記セラミック基体(11)と前記メタライズ層(12)の接合強度は25MPa以上であることを特徴とする請求項1記載の電子部品素子収納用パッケージ(10)。 - 前記ガラスは、シリカ(SiO2)、マグネシア(MgO)、カルシア(CaO)、酸化チタン(TiO2)から選択される少なくとも1種類であり、
前記セラミック成分における前記ガラスの含有量は、5~10wt%の範囲内であることを特徴とする請求項1記載の電子部品素子収納用パッケージ(10)。 - 前記ガラスは、シリカ(SiO2)、マグネシア(MgO)、カルシア(CaO)、酸化チタン(TiO2)から選択される少なくとも1種類であり、
前記セラミック成分における前記ガラスの含有量は、5~10wt%の範囲内であり、
前記部分安定化ジルコニアにおける前記イットリアのモル分率は、0.015~0.035の範囲内であることを特徴とする請求項1記載の電子部品素子収納用パッケージ(10)。
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JP2012541858A JP5937012B2 (ja) | 2010-11-01 | 2011-10-31 | 電子部品素子収納用パッケージ |
CN201180050344.8A CN103189975B (zh) | 2010-11-01 | 2011-10-31 | 电子零部件元件收纳用封装 |
EP11837991.6A EP2637204B8 (en) | 2010-11-01 | 2011-10-31 | An electronic component element housing package |
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EP2637204A1 (en) | 2013-09-11 |
US9119297B2 (en) | 2015-08-25 |
EP2637204A4 (en) | 2015-06-24 |
CN103189975A (zh) | 2013-07-03 |
JP5937012B2 (ja) | 2016-06-22 |
EP2637204B1 (en) | 2017-04-19 |
JPWO2012060341A1 (ja) | 2014-05-12 |
CN103189975B (zh) | 2016-02-17 |
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