Composition for ceramic substrate, ceramic substrate, process for producing ceramic substrate and glass composition
AssigneeMurata Manufacturing Co., Ltd.
InventorsTakahiro Takada, Hirobumi Yamamoto, Keisuke Kageyama
Life of this patent
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Abstract
A ceramic substrate composition is provided which can be co-fired with a low-melting metal and exhibits excellent dielectric characteristics at high frequencies, particularly tens of gigahertz. The ceramic substrate composition mainly contains a glass represented by aB2O3-bRe2O3-cZnO, wherein the molar ratios (a, b, and c) fall within a region defined in a ternary composition diagram by Point A (0.4, 0.595, 0.005), Point B (0.4, 0.25, 0.35), Point C (0.52, 0.01, 0.47), Point D (0.9, 0.005, 0.095), and Point E (0.9, 0.09, 0.01).
Claims15
A ceramic substrate composition comprising a glass represented by aB2O3-bRe2O3-cZnO in which Re is a rare earth element which is at least one element selected from the group consisting of lanthanum and neodymium and the molar amounts a+b+c=1;
- and wherein the molar amounts (a, b, and c) fall within a region defined in a ternary composition diagram by Point A (0.4, 0.595, 0.005), Point B (0.4, 0.25, 0.35), Point C (0.52, 0.01, 0.47), Point D (0.9, 0.005, 0.095), and Point E (0.9, 0.09, 0.01) or on the lines connection the Points, at least one oxide selected from the group consisting of aluminum oxide and titanium oxide in an amount of 50% or less by weight of the total amount, and a mixed oxide ceramic material including at least one crystal phase selected from the group consisting of ReBO3, Re3BO6, Re(B2O3)3 and ReB3O6.
A ceramic substrate comprising precipitated ReBO3 and/or ReB3O6 as a main crystal phase, the ceramic substrate being produced by the process of providing a predetermined shaped ceramic substrate composition comprising a glass represented by aB2O3-bRe2O3-cZnO in which Re is a rare earth element, a+b+c=1, and the molar amounts a, b, and c fall within a region defined in a ternary composition diagram by Point A (0.4, 0.595, 0.005), Point B (0.4, 0.25, 0.35), Point C (0.52, 0.01, 0.47), Point D (0.9, 0.005, 0.095), and Point B (0.9, 0.09, 0.01) or on the lines connecting those Points;
- and firing the shaped ceramic substrate composition.
A method for producing a ceramic substrate providing a shaped product which is a laminate comprising a plurality of layers comprising a glass represented by aB2O3-bRe2O3-cZnO in which Re is a rare earth element, a+b+c=1, and the molar amounts a, b, and c fall within a region defined in a ternary composition diagram by Point A (0.4, 0.595, 0.005), Point B (0.4, 0.25, 0.35), Point C (0.52, 0.01, 0.47), Point D (0.9, 0.005, 0.095), and Point E (0.9, 0.09, 0.01) or on the lines connecting those Points;
- and firing the shaped product.
A ceramic substrate composition comprising a glass represented by aB2O3-bRe2O3-cZnO in which Re is a rare earth element which is at least one element selected from the group consisting of lanthanum and neodymium and the molar amounts a+b+c=1;
- and wherein the molar amounts (a, b, and c) fall within a region defined in a ternary composition diagram by Point A (0.4. 0.595, 0.005), Point B (0.4. 0.25, 0.35), Point C (0.52, 0.01, 0.47), Point D (0.9, 0.005, 0.095), and Point B (0.9, 0.09, 0.01) or on the lines connection the Points, and at least one of (a) at least one oxide selected from the group consisting of aluminum oxide and titanium oxide in an amount of 50% or less by weight of the total amount, (b) a mixed oxide ceramic material including at least one crystal phase selected from the group consisting of ReBO3, Re3BO6, Re(B2O3)3 and ReB3O6, (c) a crystallization glass that can precipitate at least one crystal phase selected from the group consisting of ReBO3, Re3BO6, Re(B2O3)2 and ReB3O6 and (d) a crystallization glass that can precipitate at least one crystal phase selected from the group consisting of ReBO3, Re3BO6, Re(B2O3)2 and ReB3O6.
Dependencies are inferred from the claim text.