Abstract
High degree of densification and crystallization with a relatively short sintering time can be achieved by combining two glass-ceramics (CaO-Al2O3-SiO2 and CaO-B2O3-SiO2). The crystallization kinetics and dielectric properties of this low-temperature and cofirable binary glass-ceramics have also been investigated. Wollastonite is formed during firing. By adding alumina, however, wollastonite is replaced by anorthite. This result is attributed to the dissolution of Al into the glass, which is much faster than that of crystallization. The crystallization kinetics of anorthite follows the analysis of Avrami equations, and the result show an apparent activation energy closed to Al-O bonding strength. With increasing amount of anorthite formed in the dielectric composite, the dielectric loss decreased without significant change of the dielectric constant.