Abstract
The composition governs the crystallization ability, the type and content of crystal phases of glass-ceramics. Glass-ceramic joining materials have generated more research interest in recent years. Here, we prepared a novel Li2O–MgO–Al2O3–SiO2 glass-ceramic for the application of joining Si3N4 ceramics. We investigated the influence of the MgO/Al2O3 composition ratio on microstructure and crystallization behaviour. The crystallization kinetics demonstrated that the glasses had excellent crystallization ability and high crystallinity. β-LiAlSi2O6 and Mg2SiO4 were precipitated from the glass-ceramics, and the increase of MgO concentration was conducive to the precipitation of Mg2SiO4. Among the glass-ceramic samples, the thermal expansion coefficient of LMAS2 glass-ceramic was 3.1 × 10−6/°C, which was very close to that of Si3N4 ceramics. The wetting test showed that the final contact angle of the glass droplet on the Si3N4 ceramic surface was 32° and the interface was well bonded.
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