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.

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。