Patent ID: 6403200
Filing Date: 2002-06-11
Classification: C03C,C04B,H01G,H01L,H05K,Y10T

Abstract:
An insulator ceramic composition comprising: (A) an MgOâ€”MgAl2O4 ceramic powder, (B) a glass powder containing silicon oxide in a proportion of about 13 to 50 weight % in terms of SiO2, boron oxide in a proportion of about 3 to 60 weight % in terms of B2O3, aluminum oxide in a proportion of 0 to about 20 weight % in terms of Al2O3, (C) at least one alkali metal oxide selected from the group consisting of Li2O, K2O and Na2O in a proportion of about 10 weight % or less relative to the entirety of said glass powder, (D) zinc oxide in a proportion of about 15 weight % or less in terms of ZnO relative to the composition, and (E) copper oxide in a proportion of about 3 weight % or less in terms of CuO relative to the entirety of said glass powder.