Journal
CERAMICS INTERNATIONAL
Volume 48, Issue 14, Pages 20053-20061Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.03.281
Keywords
Glass-ceramic; Crystallization; Microstructure; Coefficient of thermal expansion
Categories
Funding
- National Natural Science Foundation of China [51872060, 51621091, U1537206]
- National Key Research and Development Plan of China [2017YFA0403804]
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The influence of MgO/Al2O3 composition ratio on microstructure and crystallization behavior of Li2O-MgO-Al2O3-SiO2 glass-ceramic for joining Si3N4 ceramics was investigated. The study found that the glass-ceramic had excellent crystallization ability and could achieve good bonding with Si3N4 ceramics.
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. beta-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 x 10(-6)/degrees 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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