Patent ID: 6630417
Filing Date: 2003-10-07
Classification: C03C,C04B,H05K,Y10T

Abstract:
A porcelain comprising;a glass phase; a spinel compound crystal phase; and a non-oxide ceramic phase made of at least one selected from the group consisting of AlN, Si3N4, SiC and BN, wherein the porcelain has a relative density that is not less than 95% and a dielectric constant that is not more than 8, and a thermal conductivity that is not less than 2 W/mÂ·K, and wherein the porcelain is formed by mixing powders of 30 to 95% by weight of a borosilicate glass powder containing at least SiO2, Al2O3, ZnO and B2O3 and 5 to 70% by weight of at least one of a non-oxide ceramic finer selected from the group consisting of AlN, Si3N4, SiC and BN, forming said powders into a predetermined shape and firing, and wherein said borosilicate glass powder contains 10 to 55% by weight of SiO2, 3 to 35% by weight of Al2O3, 2 to 25% by weight of ZnO, 3 to 25% by weight of B2O3, 0 to 30% by weight of MgO, and 0 to 50% by weight of at least one selected from CaO, SrO and BaO.