Study On Lithium Heat Resisting Ceramic Material And Its Mechanism

In this paper, the main aim of the improvement of heat shock resistance of lithium heat resisting ceramics was elaborated, and the other aim of decreasing its cost was also elaborated, so as to meet the needs to high-grade heat resisting ceramics at home and abroad, and create more economic performance for us. The know-how and its theoretical foundation on the study of lithium heat resisting chinaware were analyzed in detail. It included the prefiring of spodumene, Particle sizes of spodumene and quartz, the batch formulas of body and glaze, and its firing schedule. The experimental plan on the study of lithium heat resisting ceramic material was designed first, and then the batching formulas of body and glaze were designed by optimization method. The technological properties of body and glaze were also tested, so as to meet the needs of technology. The firing schedule was designed, so as to form better phases. The chemical compositions and phase compositions of lithium heat resisting ceramics on Li2O-Al2O3-SiO2 system and Al2O3-SiO2-MgO-Li2O system were studied thoroughly by kinds of methods. The thermal expansion coefficients of the body and glaze were 1.9×10-6/℃and 1.08×10-6/℃respectively, and this kind of ceramic material can bear temperature shock from 980℃to 20℃,in addition , lithium heat resisting ceramic material is also a kind of material with cross breaking strength of 87.9Mpa,and it has some other good properties. Some new ideas were got by research, it includes that heat resisting ceramics withβ-spodumene can be got by the use of proper spodumene in the batching formulas, and proper talc as a substitute for spodumene can further improve the heat resisting properties of the ceramic material, and decrease its cost. The particle sizes of raw material, especially the sizes of spodumene and quartz have great effects to its phase and heat resisting properties. Its firing schedule, especially its firing temperature schedule is also one of the important factors to its phase compositions and heat resisting properties. It is necessary to keep the body with 3～5% water absorption, so as to further improve its thermal shock resistance.