关键词: 反应析晶;烧结;致密化;氟云母;氟闪石

Abstract: The sintering of powder compacts of fluormica and soda-lime glass was performed by two types of heating schedules. The densification behaviors of the glass-ceramics were studied by means of the observation of their microstructural evolution using scanning electron microscopy and the measurement of the changes in the shrinkage and density of the compacts during sintering. The results show that the densification of glass-ceramics is achieved by the viscous flow of glassy　phase, the fluormica addition inhibites the viscous flow of glassy phase and reduces the driving force of sintering. Heating up to 850 ℃, fluoramphibole is formed by a reactive crystallization between fluormica and glass,which had a significant influence on the densification. The density of glass-ceramics increases with sintering temperature and isothermal time before the reactive crystallization, but decreases slightly after it because a dense interlocked rod-like fluoramphibole crystal skeleton formes gradually and seriously retards the viscous flow of glassy phase.

Key words: reactive crystallization%sintering%densification%fluormica%fluoramphibole