JP5343853B2 - ガラスセラミック組成物、ガラスセラミック焼結体および積層型セラミック電子部品 - Google Patents
ガラスセラミック組成物、ガラスセラミック焼結体および積層型セラミック電子部品 Download PDFInfo
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- JP5343853B2 JP5343853B2 JP2009530442A JP2009530442A JP5343853B2 JP 5343853 B2 JP5343853 B2 JP 5343853B2 JP 2009530442 A JP2009530442 A JP 2009530442A JP 2009530442 A JP2009530442 A JP 2009530442A JP 5343853 B2 JP5343853 B2 JP 5343853B2
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Description
(1)フォルステライトを主成分とする第1のセラミック粉末と、
(2)チタン酸ストロンチウムを主成分とするセラミック粉末および/または酸化チタンを主成分とするセラミック粉末からなる第2のセラミック粉末と、
(3)BaZrO3を主成分とする第3のセラミック粉末と、
(4)SrZrO3を主成分とする第4のセラミック粉末と、
(5)ホウケイ酸ガラス粉末と
を含む。
上記第1のセラミック粉末は、この発明に係るガラスセラミック組成物において、54重量%以上かつ77重量%以下含む。また、第1のセラミック粉末は、主成分となるフォルステライト以外の不純物量が5重量%以下である。
2 多層セラミック基板
3 ガラスセラミック層
4 高誘電性セラミック層
6 内部導体膜
7,43,45,46,50,52,56,57,59 ビアホール導体
8 外部導体膜
21 LCフィルタ
23 部品本体
24〜27 端子電極
28〜40 セラミックグリーンシート
41,44,58,60 コイルパターン
42,48,49,54,55,61 引出しパターン
47,51,53 コンデンサパターン
まず、ガラスセラミック組成物に含まれるホウケイ酸ガラス粉末として、表1に示すような種々の組成のものを用意した。
容量変化率[%]={(C1−C0)/C0}×100の式から求めた。
実験例2は、第4のセラミック粉末を構成するSrZrO3の優位性を確認するために実施したものである。より具体的には、実験例2では、この発明の範囲内の試料として、実験例1において作製した試料44を採用し、これを基準として、SrZrO3の優位性を確認した。そのため、第4のセラミック粉末として、平均粒径0.5μmのSrZrO3粉末の他、平均粒径0.5μmのAl2O3粉末を用意した。
図1および図2に示したセラミック多層モジュール1に備える多層セラミック基板2を製造するに際し、この発明に係るガラスセラミック組成物を用いて構成される低誘電率のガラスセラミック層3と高誘電体セラミック組成物を用いて構成される高誘電性セラミック層4との間での共焼結性が問題となるが、実験例3では、この共焼結性について調査した。
Claims (3)
- フォルステライトを主成分とする第1のセラミック粉末と、
チタン酸ストロンチウムを主成分とするセラミック粉末および/または酸化チタンを主成分とするセラミック粉末からなる第2のセラミック粉末と、
BaZrO3を主成分とする第3のセラミック粉末と、
SrZrO3を主成分とする第4のセラミック粉末と、
リチウムをLi2O換算で3〜15重量%、マグネシウムをMgO換算で20〜50重量%、ホウ素をB2O3換算で15〜30重量%、ケイ素をSiO2換算で10〜35重量%、および亜鉛をZnO換算で6〜20重量%含むとともに、酸化カルシウム、酸化バリウムおよび酸化ストロンチウムからなる群より選ばれる少なくとも1種の添加成分を含む、ホウケイ酸ガラス粉末と
を含み、
前記第1のセラミック粉末を、54重量%以上かつ77重量%以下含み、
前記第1のセラミック粉末は、前記フォルステライト以外の不純物量が5重量%以下であり、
前記ホウケイ酸ガラス粉末に含まれる前記添加成分の含有率を当該ホウケイ酸ガラス粉末に占める割合で表したとき、前記添加成分の含有率の下限は、酸化カルシウム、酸化バリウムおよび酸化ストロンチウムを、それぞれ、CaO、BaOおよびSrOに換算して、合計で5重量%であり、かつ、前記添加成分の含有率の上限は、酸化カルシウムの場合にはCaO換算で15重量%であり、酸化バリウムの場合にはBaO換算で25重量%であり、酸化ストロンチウムの場合にはSrO換算で25重量%であり、
前記第2のセラミック粉末が前記チタン酸ストロンチウムを主成分とするセラミック粉末を含む場合、チタン酸ストロンチウムの含有率はSrTiO3換算で3重量%以上かつ13重量%以下であり、第2のセラミック粉末が酸化チタンを主成分とするセラミック粉末を含む場合、酸化チタンの含有率はTiO2換算で0.3重量%以上かつ10重量%以下であり、
前記第3のセラミック粉末を、2重量%以上かつ20重量%以下含み、
前記第4のセラミック粉末を、2重量%を超えかつ20重量%以下含み、
前記ホウケイ酸ガラス粉末を、3重量%以上かつ20重量%以下含む、
ガラスセラミック組成物。 - 請求項1に記載のガラスセラミック組成物を所定形状に成形し、1000℃以下の温度で焼成することによって得られた、ガラスセラミック焼結体。
- 積層された複数のガラスセラミック層と、前記ガラスセラミック層に関連して設けられる配線導体とを備える、積層型セラミック電子部品であって、前記ガラスセラミック層は請求項2に記載のガラスセラミック焼結体からなり、前記配線導体は銅または銀を主成分とする、積層型セラミック電子部品。
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