Patent ID: 6623845
Filing Date: 2003-09-23
Classification: C03C,Y10T

Abstract:
A glass-ceramic composition, said glass ceramic composition obtained by forming and firing a first mixture consisting essentially of a glass composite powder and Mg2SiO4, wherein the first mixture consists essentially of:a) 55 to 65 wt. %, based on the total weight the glass composite powder and Mg2SiO4 in the first mixture, of the glass composite powder; in which the glass composite powder is obtained by forming and firing a second mixture, the second mixture consisting essentially of: 40 to 50 wt. % of SiO2, 30 to 40 wt. % of BaO, 3 to 8 wt. % of Al2O3, 8 to 12 wt. % of La2O3, and 3 to 6 wt. % of B2O3, based on the total weight of SiO2, BaO, Al2O3, La2O3, and B2O3 in the second mixture; and b) 45 to 35 wt. %, based on the total weight the glass composite powder and Mg2SiO4 in the first mixture, of Mg2SiO4, and in which said glass ceramic composition has a thermal expansion coefficient of 9 ppm/K or greater and a flexural strength of 150 MPa or greater.