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 °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 °C respectively. Melting of the glass powders prepared occurred at a temperature of 750 °C. A pellet sintered at a temperature of 900 °C had a fully-crystallized structure and dense structure. The main crystal structure of the sintered pellets was CaSiO₃.