WO2016114075A1 - 無鉛ガラス及び封着材料 - Google Patents
無鉛ガラス及び封着材料 Download PDFInfo
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- WO2016114075A1 WO2016114075A1 PCT/JP2015/085734 JP2015085734W WO2016114075A1 WO 2016114075 A1 WO2016114075 A1 WO 2016114075A1 JP 2015085734 W JP2015085734 W JP 2015085734W WO 2016114075 A1 WO2016114075 A1 WO 2016114075A1
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- WIPO (PCT)
- Prior art keywords
- glass
- softening point
- lead
- teo
- zno
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
- C03C8/02—Frit compositions, i.e. in a powdered or comminuted form
- C03C8/04—Frit compositions, i.e. in a powdered or comminuted form containing zinc
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
- C03C8/24—Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders
Definitions
- the present invention relates to a sealing material using lead-free glass having a low softening point.
- solder and glass have been used as bonding and sealing materials for electronic components.
- semiconductor packages, crystal resonators, MEMS, and the like have a low heat resistance of about 400 ° C., so gold-tin solder or lead glass is used.
- the materials used for these materials are required to have various properties such as chemical durability, mechanical strength, and fluidity depending on the application, but especially when used as a sealing material, fluidity at low temperatures is an important factor. As mentioned.
- Patent Document 1 gold-tin solder is used for manufacturing a piezoelectric vibrator having a built-in crystal resonator, and sealing at 250 ° C. to 500 ° C. is disclosed.
- an alternative material is required because gold-tin solder is expensive and lead glass contains a large amount of PbO, which has a large burden on the human body and the environment.
- Patent Document 2 proposes a V 2 O 5 —TeO 2 —BaO—ZnO-based glass as a glass exhibiting a low softening point.
- the document includes a four-component glass containing 16 to 80% by weight of V 2 O 5 , 0 to 60% by weight of TeO 2 , 4 to 50% by weight of BaO, and 0 to 40% by weight of ZnO, or 40 100 parts by weight of lead-free low-melting glass composed of -80% by weight of V 2 O 5 , 0-40% by weight of ZnO, 10-50% by weight of BaO, and 1-60 parts per 100 parts by weight of the three components. Glass prepared by adding parts by weight of TeO 2 is disclosed.
- the softening point is 310 to 320 ° C. in this example.
- fluidity is good, there is no description about the actual evaluation method, and it is unclear how much fluidity it has.
- Patent Document 3 proposes glasses showing low softening points of V 2 O 5 —TeO 2 —WO 3 —P 2 O 5 and V 2 O 5 —TeO 2 —WO 3 —ZnO.
- the above-mentioned V 2 O 5 —TeO 2 —WO 3 —P 2 O 5 glass has a slightly insufficient fluidity, and the softening point is increased by containing P 2 O 5 .
- the V 2 O 5 —TeO 2 —WO 3 —ZnO glass described above exhibits excellent fluidity, and the softening point is in the range of 335 to 383 ° C. in the examples in which the BaO component is added to the essential components. ing.
- a sealing material that can be sealed at a low temperature of 400 ° C. or less is required, but gold-tin solder is expensive, and glass containing lead has been used in recent years due to environmental impact. The tendency to avoid.
- a glass having a low softening point tends to be less stable, and since it tends to devitrify during firing or heating, the softening point is low, and There is still a need for low softening point glass with fluidity that is important for sealing.
- an object of the present invention is to obtain a sealing material having a softening point and fluidity that can be sealed at a low temperature.
- V 2 O 5 -TeO 2 -RO (RO is, MgO, CaO, SrO, and at least one selected from the group consisting of BaO) in -ZnO-based low softening point lead-free glass, V 2 O 5 5 to 55 wt%, TeO 2 5 to 75 wt%, RO (RO is at least one selected from the group consisting of MgO, CaO, SrO and BaO) in total 1 to 25 wt%, ZnO 0.1 Lead-free glass containing up to 6 wt% and R 2 O (R 2 O is at least one selected from the group consisting of Li 2 O, Na 2 O, and K 2 O) in a total amount of 0.1 to 3 wt% is there.
- RO is, MgO, CaO, SrO, and at least one selected from the group consisting of BaO
- the lead-free glass of the present invention has good fluidity at low temperatures and can be suitably used as a sealing material.
- low temperature refers to 400 ° C. or lower.
- sealing is performed at a temperature equal to or higher than the softening point of glass, more preferably at a temperature equal to or higher than the softening point + 20 ° C.
- the present invention enables sealing at 400 ° C. or lower.
- the sealing temperature is further increased. A low temperature is possible.
- “lead-free” means that the glass component does not substantially contain lead, for example, a PbO content of less than 0.3 wt%.
- the above fluidity was measured in Examples described later.
- the sample is heated at 350 ° C. for 10 minutes, cooled to room temperature, the diameter of the sample is measured, and the measured diameter is expanded by 10% or more compared to before heating and the fluidity is good. did.
- V 2 O 5 , TeO 2 , RO is at least one selected from the group consisting of MgO, CaO, SrO, and BaO having a softening point that can be sealed at a low temperature of 400 ° C. or less.
- V 2 O 5 -TeO 2 -RO (RO is, MgO, CaO, SrO, and at least one selected from the group consisting of BaO) in -ZnO-based low softening point lead-free glass, a V 2 O 5 5 to 55 wt%, TeO 2 5 to 75 wt%, RO (RO is at least one selected from the group consisting of MgO, CaO, SrO, and BaO) in total 1 to 25 wt%, ZnO 0.1 to Lead-free glass containing 6 wt% and R 2 O (R 2 O is at least one selected from the group consisting of Li 2 O, Na 2 O, and K 2 O) in a total amount of 0.1 to 3 wt%. .
- R 2 O a metal component
- a glass having a low softening point tends to be less stable and tends to devitrify during firing or heating.
- R 2 O The above components while reducing the softening point, devitrification in the glass is likely to occur with the increasing content. Based on the above findings, if the upper limit of the total value of the R 2 O component is 3 wt%, the softening point is lowered without devitrification even in the case of lead-free glass as described above. I found out that it is possible.
- the lead-free glass of the present invention when applied to a substrate having an alkali component such as soda lime glass and baked, it is newly found that the adhesion to the substrate is improved by containing the R 2 O component. It was. By improving the adhesion to the substrate, it is difficult to peel off the glass from the substrate when an impact is applied, which is useful as a sealing material.
- the glass When sealing with glass, the glass is usually powdered, and the glass powder pasted using an organic vehicle is applied to a predetermined position, followed by heating and baking.
- the “lead-free glass” of the present invention includes glass powder and a state after firing.
- the lead-free glass of the present invention will be described below.
- V 2 O 5 has the effect of lowering the softening point of the glass and is contained in the glass in the range of 5 to 55 wt%. If it exceeds 55 wt%, vitrification tends to be difficult depending on the balance with other components, and even if vitrified, devitrification tends to occur. If it is less than 5 wt%, the effect of lowering the softening point cannot be sufficiently exhibited.
- the lower limit may be 24 wt%, more preferably 36 wt%. Moreover, it is good also considering an upper limit as 48 wt% preferably.
- TeO 2 has the effect of increasing the fluidity of the glass and is contained in the glass in the range of 5 to 75 wt%. If it exceeds 75 wt%, other components that lower the softening point are insufficient, and it is difficult to sufficiently lower the softening point. If it is less than 5 wt%, vitrification itself is difficult, and V 2 O 5 —TeO 2 —RO—ZnO glass cannot be obtained.
- the lower limit may be 31 wt%, more preferably 40 wt%.
- the upper limit value is preferably 70 wt%, more preferably 59 wt%.
- a glass having a low softening point is poor in stability and tends to be devitrified during firing. Since the stability of the V 2 O 5 —TeO 2 glass tends to be roughly determined by the content of V 2 O 5 and TeO 2 and the ratio of TeO 2 / V 2 O 5 , in the present invention, TeO 2 and V The total of 2 O 5 is preferably 60 to 98 wt%, and the TeO 2 / V 2 O 5 ratio is preferably 0.7 to 10.
- R 2 O has the effect of lowering the softening point of the glass and increasing the fluidity, and is contained in the glass in a total range of 0.1 to 3 wt%. If it is less than 0.1 wt%, the effect of lowering the softening point cannot be exhibited. If it exceeds 3 wt%, the softening point is lowered but the tendency to devitrification becomes stronger compared to the case where the R 2 O component is not added. It becomes difficult to flow.
- Li 2 O, Na 2 O, and K 2 O are preferably used as the R 2 O component to be used. More preferably, Li 2 O may necessarily be included. Two or more components may be used in combination.
- the lower limit may be 0.3 wt%, more preferably 0.7 wt%, and even more preferably 1.2 wt%.
- the upper limit is preferably 2.6 wt%, more preferably 2.4 wt%.
- RO has the effect of thermally stabilizing the glass and adjusting the linear expansion coefficient, and is contained in the glass in a total range of 1 to 25 wt%. If it is less than 1 wt% or more than 25 wt%, the above action may not be exhibited depending on the relationship with other components. Moreover, the fluidity at the time of softening tends to decrease due to crystallization.
- the RO component to be used BaO is preferably used. Also, it is preferable to use a combination of two or more components because the linear expansion coefficient can be lowered.
- the lower limit may be 6 wt%.
- the upper limit is preferably 20 wt%, more preferably 16 wt%.
- ZnO has the effect of lowering the softening point of the glass and lowering the coefficient of thermal expansion, and is contained in the glass in the range of 0.1 to 6 wt%.
- content exceeds 6 wt%, stability of glass will fall and the fluidity
- the lower limit may be 1 wt%.
- the upper limit value is preferably 5 wt%, more preferably 4 wt%.
- V 2 O 5 , TeO 2 , RO, ZnO, and R 2 O are essential components. Basically, V 2 O 5 + TeO 2 + RO + R 2 O + ZnO is preferably 100 wt%.
- an optional component may be included in the above essential component within a range of 10 wt% or less, preferably 5 wt% or less, more preferably 3 wt% or less. Examples of the optional component include Al 2 O 3 , Fe 2 O 3 , NiO, CuO, CoO, and ZrO 2 .
- Al 2 O 3 , Fe 2 O 3 , NiO, CuO, CoO, ZrO 2 and the like suppress the devitrification of the glass and adjust the linear expansion coefficient.
- V 2 O 5 + TeO 2 + RO + ZnO + R 2 O + Fe 2 O 3 + NiO + Al 2 O 3 + CoO + ZrO 2 may be 100 wt% from the above-described essential components and suitable optional components.
- the lead-free glass of this invention does not contain phosphoric acid substantially in a glass component.
- the moisture resistance may be lowered or the fluidity may be lowered.
- “Substantially no phosphoric acid” may mean that the content of P 2 O 5 is less than 0.5 wt%. Moreover, it is good also as less than 0.1 wt% preferably.
- lead-free glass of the present invention preferably contains substantially no Bi 2 O 3 in the glass component.
- Bi 2 O 3 is contained in the lead-free glass as in the present invention, the glass becomes unstable and is easily devitrified.
- “Substantially does not contain Bi 2 O 3 ” may mean that the content of Bi 2 O 3 is less than 1 wt%. Moreover, it is good also as less than 0.3 wt% preferably.
- the total content may be less than 5 wt%, and more preferably less than 1 wt%.
- sealing is performed at a temperature equal to or higher than the softening point of glass, more preferably at a temperature equal to or higher than the softening point + 20 ° C.
- the softening point of the glass powder can be 330 ° C. or lower, more preferably 320 ° C. or lower. Therefore, the temperature at the time of sealing can be made lower.
- the lower limit value of the softening point is not particularly limited, but may be, for example, 250 ° C., preferably 280 ° C.
- the lead-free glass of the present invention preferably has a linear expansion coefficient of 100 to 180 ⁇ 10 ⁇ 7 / K at 30 to 200 ° C.
- one preferred embodiment of the present invention is a sealing material containing the lead-free glass and the inorganic filler, and the inorganic filler is in the range of 1 to 35 vol% with respect to the total amount of the lead-free glass and the inorganic filler. It is a sealing material contained inside.
- the inorganic filler By using the inorganic filler, it is possible to lower the linear expansion coefficient of the sealing material containing the inorganic filler. If the content of the inorganic filler is less than 1 vol%, the effect of lowering the linear expansion coefficient becomes insufficient, and if the content of the inorganic filler exceeds 35 vol%, the fluidity as the sealing material is lowered and sealing is not achieved. It becomes easy to become enough.
- Examples of the inorganic filler used in the present invention include zirconium phosphate compounds ((ZrO) 2 P 2 O 7 , NaZr 2 (PO 4 ) 3 , KZr 2 (PO 4 ) 3 , Ca 0.5 Zr 2 (PO 4 ) 3 , NbZr. (PO 4 ) 3 , Zr 2 (WO 4 ) (PO 4 ) 2 ), zirconium compounds (ZrSiO 4 , ZrW 2 O 8 ), cordierite, ⁇ -eucryptite, SiO 2 and the like can be used.
- the inorganic filler is preferably a zirconium phosphate compound or a zirconium compound.
- One of the preferred embodiments of the present invention is a glass paste containing the above-mentioned glass powder made of lead-free glass and an organic vehicle.
- the glass paste of the present invention is kneaded with the glass powder and the organic vehicle to form a paste, which is then applied to a predetermined location and fired to seal a desired member. Moreover, you may mix the inorganic filler mentioned above in this glass paste.
- the solid content (glass powder + inorganic filler) is preferably 20 to 80 wt% with respect to the total mass of the glass paste. When it exceeds 80 wt%, the viscosity of the glass paste becomes too high, and application becomes difficult. On the other hand, if it is less than 20 wt%, the glass component becomes too small, and hermetic sealing becomes difficult.
- the above-mentioned organic vehicle is composed of an organic solvent and an organic binder, and disappears by burning, decomposition, and volatilization after heating and baking the glass paste.
- the above organic binder is for dispersing and holding glass powder and inorganic filler in the glass paste, and is removed from the paste by heating when the glass paste is fired.
- the organic solvent is not particularly limited as long as it can be removed from the glass paste at the time of heating, similar to the above organic binder.
- one preferred embodiment of the present invention is a method for manufacturing an electronic component characterized by having a step of firing and sealing at a temperature exceeding the softening point after applying the glass paste.
- the electronic component include a semiconductor package, a crystal resonator, and a MEMS.
- the baking temperature may be 400 ° C. or lower, more preferably 360 ° C. or lower, and further preferably 340 ° C. or lower.
- the present invention is naturally applicable even when the firing temperature exceeds 400 ° C.
- Example 11 is a glass material obtained by mixing 5 wt% (6 vol%) of a glass material of Example 10 and 8 wt% (13 vol%) of eucryptite filler with the glass powder of Example 2.
- the linear expansion coefficient was measured with a thermomechanical analyzer (TMA8310 manufactured by Rigaku Corporation). In this measurement, the above sample was melted, formed into a cylinder of 20 mm ⁇ 5 mm ⁇ (height ⁇ diameter), and the one whose upper bottom surface was formed in parallel was used as a measurement sample. The temperature was raised in minutes and the linear expansion coefficient ⁇ was determined. Moreover, quartz glass was used for the standard sample.
- the softening point was measured with a differential thermal analyzer (TG8120 manufactured by Rigaku Corporation). Each sample ground in a mortar was heated at 10 ° C./min, and the second inflection point of the obtained DTA curve was taken as the softening point.
- TG8120 manufactured by Rigaku Corporation
- Each of the samples obtained above had good fluidity in Examples 1 to 11 and had a softening point of 320 ° C. or less, which was useful for use as a sealing material.
- Comparative Examples 1 and 2 were crystallized at the stage of casting on carbon at the time of glass production, subsequent evaluation was not performed. Moreover, although the comparative examples 3 and 4 had a low softening point, devitrification occurred at the time of fluidity
- Comparative Example 7 was not crystallized at the time of glass production, it was crystallized at the time of measuring the softening point, the linear expansion coefficient, and the fluidity, and thus each evaluation could not be performed.
- Comparative Example 8 although the softening point and linear expansion coefficient showed good values, the fluidity was insufficient and it was not suitable for the purpose of the present invention.
- Examples 4 to 6 are glass powders having a total R 2 O content of 1.4% by mass or more, a softening point of 310 ° C. or less, and good flowability at 350 ° C. In Examples 1 to 3, 7, and 8, there was also a tendency that the glass hardly peeled off as the content of the R 2 O component increased.
- the glass powder When the glass powder is actually used on a soda lime substrate, the glass powder contains a material that adjusts the linear expansion coefficient such as an inorganic filler in order to prevent the substrate from being destroyed, It is possible to do.
- Comparative Examples 3 to 5 did not improve the adhesion as in Examples 4 to 6.
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Abstract
Description
原料酸化物としてV2O5粉末、TeO2粉末、BaO粉末、SrO粉末、MgO粉末、CaO粉末、Li2CO3粉末、Na2CO3粉末、K2CO3粉末、ZnO粉末、P2O5液(正リン酸)、Al2O3粉末を表1に記載の比率(wt%)になるように混合したもの(全量50g)を白金るつぼに収容し、電気炉内で約1100℃にて30分間熔融した。得られた熔融物をカーボン上にキャストし、乳鉢にて粉砕することでガラス粉末を得た。尚、上記のキャスト時に結晶や未溶解物が発生していないか確認し、問題なくガラス化したものは○、そうでないものは×として表1、表2に記載した。なお、表1、2は小数点以下第2位を端数処理しており、合計値が100%にならない場合がある。
得られたガラス粉末及びガラス材料のうちガラス化したサンプル(表1、表2のガラス化が○のもの)について、軟化点、線膨張係数、及び流動性をそれぞれ調べた。その結果も併せて表1、表2に示す。なお、各項目の測定方法は次の通りである。
熱機械分析装置(リガク社製TMA8310)により、線膨張係数を測定した。この測定は、上記サンプルを溶融し、これを20mm×5mmφ(高さ×径)の円柱に成形し、上底面が平行に成形されたものを測定試料として用い、30~200℃まで5℃/分で昇温させ、線膨張係数αを求めた。また、標準サンプルには石英ガラスを用いた。
示差熱分析装置(リガク社製TG8120)により軟化点を測定した。乳鉢で粉砕した各サンプルを10℃/minで昇温し、得られるDTA曲線の第二変曲点を軟化点とした。
得られた各サンプルについてハンドプレス機を用いて高さ10mm×径10mmφの円柱状にプレス成形し、ソーダライムガラス基板上で350℃、10分間加熱した。加熱後、常温まで冷却して、冷却後の試料の径を計測した。計測径が加熱前に比べて20%以上拡大した場合(計測径12mm以上)を◎、10%以上、20%未満拡大した場合(計測径11mm以上、12mm未満)を○、10%未満拡大した場合(11mm未満)を△、流動しなかったものを×、として流動性を評価した。尚、比較例6は流動性を評価する350℃よりも軟化点が高かった為、流動性の評価は行わなかった。
上記の流動性評価試験後の実施例1~8、比較例3~5のサンプルを用いて、ソーダライムガラス基板との密着性を簡易に評価した。流動性評価試験後、いずれのサンプルも流動したガラスが基板に接着していた。上記の基板と流動したガラスとを引き剥がそうとした際に、ガラスが基板から離れず、最終的に基板が破壊へ至ったものについて、密着性が向上したと評価した。上記の破壊は、流動後のガラスが接着した基板部分と、ガラスが接着していない基板部分との境界に生じた。
ガラス粉末の封着性能を評価するため、ヘリウムガスによるリークテストを行った。封着したサンプルをヘリウム雰囲気チャンバー内で0.2MPaの圧力で2時間加圧した後、該サンプルを減圧し、漏れ出たヘリウムガスをヘリウムリークディテクター(ULVAC社製HELIOT900)を使用して検知した。リークテストは3個の評価用サンプルについて実施し、リークレートが1×10-9Pa・m3/sec以下を封着性能が良好とした。
Claims (5)
- V2O5-TeO2-RO(ROは、MgO、CaO、SrO、及びBaOからなる群から選ばれる少なくとも1種)-ZnO系低軟化点無鉛ガラスにおいて、
V2O5を5~55wt%、
TeO2を5~75wt%、
RO(ROは、MgO、CaO、SrO、及びBaOからなる群から選ばれる少なくとも1種)を合計で1~25wt%、
ZnOを0.1~6wt%、及び
R2O(R2Oは、Li2O、Na2O、及びK2Oからなる群から選ばれる少なくとも1種)を合計で0.1~3wt%含有する無鉛ガラス。 - 請求項1に記載の無鉛ガラスと、無機フィラーとを含む封着材料であって、該ガラスと該無機フィラーの総量に対して、該無機フィラーを1~35vol%の範囲内で含有することを特徴とする封着材料。
- 請求項1に記載の無鉛ガラスからなるガラス粉末と有機ビヒクルとを含有することを特徴とするガラスペースト。
- 請求項3に記載のガラスペーストを基材上に塗布した後、軟化点を超える温度で焼成し封着する工程を有することを特徴とする電子部品の製造方法。
- 前記の焼成工程において、焼成温度が400℃以下であることを特徴とする請求項4に記載の電子部品の製造方法。
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KR1020177019970A KR20170096026A (ko) | 2015-01-15 | 2015-12-22 | 무연 유리 및 실링 재료 |
CN201580072173.7A CN107108339A (zh) | 2015-01-15 | 2015-12-22 | 无铅玻璃和密封材料 |
US15/537,911 US10118856B2 (en) | 2015-01-15 | 2015-12-22 | Lead-free glass and sealing material |
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