Sintering characteristics of CaO-B2O3-SiO2 glass-ceramic powders prepared by spray pyrolysis

CaO-B2O3-SiO2 glass powders for low-temperature co-fired ceramic applications were directly prepared by high temperature spray pyrolysis. The glass powders with a spherical shape, dense structure, fine size and narrow size distribution were prepared at a temperature of 1400 degrees C by complete melting and quenching processes. The composition of the spray solution was well maintained in the glass powders prepared by spray pyrolysis. The glass transition temperature (T-g) and glass crystallization temperature (T-c) of the glass powders were 704 and 836 degrees C respectively. Melting of the glass powders prepared occurred at a temperature of 750 degrees C. A pellet sintered at a temperature of 900 degrees C had a fully-crystallized structure and dense structure. The main crystal structure of the sintered pellets was CaSiO3.