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Study of Li2O addition on crystallization behavior and thermal expansion properties of CaO-Al2O3–SiO2 (CAS) glass-ceramic and its application for joining SiC ceramic
Journal of the European Ceramic Society ( IF 5.8 ) Pub Date : 2020-10-31 , DOI: 10.1016/j.jeurceramsoc.2020.10.061
Jian Fang , Liangbo Sun , Songsong Guo , Chunfeng Liu , Jie Zhang

Various glass-ceramics were prepared based on the CaO-Al2O3-SiO2 system with the addition of Li2O in an attempt to develop a suitable sealant for SiC ceramic. The effects of Li2O content on crystallization behavior and thermal expansion properties were systematically investigated. The results revealed that the addition of Li2O significantly reduced the crystallization activation energy of glass. Besides, as the Li2O content increased, the precipitation of spodumene and wollastonite was promoted while the precipitation of anorthite was suppressed. By controlling the Li2O content and crystallization treatment, the coefficient of thermal expansion (CTE) of glass-ceramic could be adjusted in a certain range, from 8.5 × 10−6/°C to 2.8 × 10−6/°C. When the content of Li2O was 3 wt.%, the CTE of the formed glass-ceramic was well-matched with that of SiC ceramic. Furthermore, it was confirmed that this glass-ceramic possessed an excellent wettability and weldability to SiC ceramic.



中文翻译:

Li 2 O的添加对CaO-Al 2 O 3 -SiO 2(CAS)玻璃陶瓷结晶行为和热膨胀性能的影响及其在SiC陶瓷结合中的应用

基于CaO-Al 2 O 3 -SiO 2系统并添加Li 2 O制备了各种玻璃陶瓷,以试图开发出适用于SiC陶瓷的密封剂。系统地研究了Li 2 O含量对结晶行为和热膨胀性能的影响。结果表明,Li 2 O的添加显着降低了玻璃的结晶活化能。此外,随着Li 2 O含量的增加,锂辉石和硅灰石的沉淀得到促进,而钙长石的沉淀得到抑制。通过控制Li 2O含量和结晶处理,热膨胀的玻璃-陶瓷(CTE)的系数可以在一定范围内进行调整,从8.5×10 -6 /℃至2.8×10 -6 /℃。当Li 2 O的含量为3重量%时,所形成的玻璃-陶瓷的CTE与SiC陶瓷的CTE非常匹配。另外,可以确认该玻璃陶瓷对SiC陶瓷具有优异的润湿性和焊接性。

更新日期:2020-12-01
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