JP5937012B2 - 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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- JP5937012B2 JP5937012B2 JP2012541858A JP2012541858A JP5937012B2 JP 5937012 B2 JP5937012 B2 JP 5937012B2 JP 2012541858 A JP2012541858 A JP 2012541858A JP 2012541858 A JP2012541858 A JP 2012541858A JP 5937012 B2 JP5937012 B2 JP 5937012B2
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- H01L23/053—Containers; Seals characterised by the shape of the container or parts, e.g. caps, walls the container being a hollow construction and having an insulating or insulated base as a mounting for the semiconductor body
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- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
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- B22F7/00—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
- 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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- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
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と,を有してなる電子部品素子収納用パッケージにおいて、
前記セラミック基体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、
前記セラミック組成物における前記マグネシアの含有量は0.05〜1wt%の範囲内であり、
前記メタライズ層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。 - 同時焼成後の前記セラミック基体の曲げ強度は550MPa以上であり、
同時焼成後の前記セラミック基体と前記メタライズ層の接合強度は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。 - 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。 - 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。
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