Glass-ceramic sintered body, a process for its preparation and a glass- ceramic substrate

摘要

A glass-ceramic sintered body comprising an SiO.sub.2 --Al.sub. 2 O.sub. 3 --MgO--ZnO--B.sub.2 O.sub.3 type crystalline glass and alumina, said sintered body containing at least 10% by weight of a spinel crystalline phase; and a substrate composed of the sintered material. There is also provided a process for producing the glass-ceramic sintered body which comprises adding a binder to a mixed powder of an SiO.sub.2 -- Al.sub.2 O. sub.3 --MgO--ZnO--B.sub.2 O.sub.3 type crystalline glass and alumina, molding the mixture into a predetermined shape, and firing the mixture into a predetermined shape, and firing the molded mixture at a temperature of 925° to 1000° C. in a non-oxidizable atmosphere. The glass-ceramic sintered body and the substrate composed of it in accordance with the present invention have excellent mechanical strength and thereby have markedly increased metallizing adhesion strength.