JP4840935B2 - セラミック多層基板 - Google Patents
セラミック多層基板 Download PDFInfo
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- JP4840935B2 JP4840935B2 JP2007253528A JP2007253528A JP4840935B2 JP 4840935 B2 JP4840935 B2 JP 4840935B2 JP 2007253528 A JP2007253528 A JP 2007253528A JP 2007253528 A JP2007253528 A JP 2007253528A JP 4840935 B2 JP4840935 B2 JP 4840935B2
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Description
「JapaneseJournal of Applied physics」, Vol. 45. No. 9B, 2006, pp 7360-7364 「DielectricProperties and Microstructures of Low-Temperature-Sintered BaTiO3-BasedCeramics with CuBi2O4 sintering Aid」
(1) CuOおよびBi2O3を別々の酸化物の形で添加する。
(2) CuOとBi2O3との複合酸化物を添加する。
(3) (1)の複数種類の酸化物と、(2)の複合酸化物とを両方とも添加する。
必須成分
BaO:40〜65重量部
Al2O3:0.1〜20重量部
SiO2:25〜46重量部
任意成分
ZnO:0.5〜20重量部
必要に応じて前述した酸化ホウ素含有ガラス成分のいずれかを0.3〜5.0重量部添加してもよい。
(誘電体原料の作製)
所望の組成となるように各酸化物粉末を秤量し、湿式混合して、チタン酸バリウム系誘電体および低誘電率誘電体の双方について、各混合粉末を得る。その後、低誘電率材は1050−1300℃で仮焼し、高誘電率材は1000〜1100℃で仮焼した。その後粉砕して各セラミック原料粉末を得た。
表1に示す各ガラス種A、B、Cを作製した。各ガラス成分を構成する各酸化物を秤量し、乾式混合によって混合物を得た。その後、白金ルツボ中で溶融させ、溶融物を水中で急速冷却して塊状のガラスを得た。このガラスを湿式粉砕して、各低融点ガラス粉末を得た。
得られた仮焼物とガラス、必要に応じて所定量のCuOを添加し、粉砕して低誘電率セラミック原料粉末を得た。表2〜5に記載の低誘電率材組成の誘電率は、すべて20〜30、Q値(3GHz)は3000以上である。
チタン酸バリウム系誘電体仮焼物に対して所定量のCuOおよびBi2O3を添加し、粉砕して、表2〜5記載の各高誘電率セラミック原料を得た。
調整した各原料粉末に有機バインダ、可塑剤、分散剤および有機溶剤を加え、ボールミルにて混合し、スラリーを得た。このスラリーを用いてドクターブレード装置によって厚さ0.02〜0.1mmのグリーンシートを成形した。
低誘電率セラミックグリーンシートを焼成後厚みが2mm程度になるように積層し、その中間に高誘電率セラミックグリーンシートを挿入して焼成し、約3mm×30mm×2mmの試験片を取り出して3点曲げ試験を行った。接合性は同様の構造物に対し、鏡面研磨を行って接合界面部のクラック、空隙、相互拡散を電子顕微鏡で観察した。この結果を表2、3、4、5に示す。
低誘電率セラミックグリーンシートの中間に高誘電率セラミックグリーンシートを挿入した構造物に対し、あらかじめ高誘電率層の一部が容量層となるようにスクリーン印刷によって電極パターン(電極の重なりの面積は焼成後2mm2)を形成し、ビアで電極を引き出す。その後適当な大きさにカットして容量を測定し、誘電率を算定した。この結果を表2、3、4、5に示す。
Claims (7)
- 低誘電率層と高誘電率層との共焼結によって得られるセラミック多層基板であって、
前記低誘電率層が、xBaO−yTiO2−zZnOの組成を有し、x、y、zは、それぞれ、モル比率を示し、x+y+z=1、0.09≦x≦0.20、0.49≦y≦0.61および0.19≦z≦0.42の関係を満足するセラミック成分と、このセラミック成分100重量部に対して1.0重量部以上、5.0重量部以下添加されている酸化ホウ素含有ガラス成分を含んでおり、前記高誘電率層が、CuOおよびBi2O3が添加され、ガラス成分が含有されていないチタン酸バリウム系誘電体であることを特徴とする、セラミック多層基板。
- 前記高誘電率層において、前記チタン酸バリウム系誘電体100重量部に対して、0.5重量部以上、4.0重量部以下のCuOおよび4.0重量部以上、9.0重量部以下のBi2O3が添加されていることを特徴とする、請求項1記載のセラミック多層基板。
- 前記低誘電率層において、前記セラミック成分100重量部に対して20重量部以下のCuOが添加されていることを特徴とする、請求項1または2記載のセラミック多層基板。
- 前記セラミック多層基板が、BaO−Al2O3−SiO2系セラミックを含んでおり、前記低誘電率層が、このBaO−Al2O3−SiO2系セラミックと共焼結により接合されていることを特徴とする、請求項1〜3のいずれか一つの請求項に記載のセラミック多層基板。
- 前記共焼結の温度が1000℃以下であることを特徴とする、請求項1〜4のいずれか一つの請求項に記載のセラミック多層基板。
- Ag、CuおよびAg−Pd合金からなる群より選ばれた材質からなる導電膜を備えていることを特徴とする、請求項1〜5のいずれか一つの請求項に記載のセラミック多層基板。
- 一対の電極層を備えており、これら一対の電極層間に前記高誘電率層が配置されており、この一対の電極層によって所定の静電容量が引き出されていることを特徴とする、請求項1〜6のいずれか一つの請求項に記載のセラミック多層基板。
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PCT/JP2008/064164 WO2009041166A1 (ja) | 2007-09-28 | 2008-07-31 | セラミック多層基板 |
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