材料科学
莫来石
微观结构
液相
相(物质)
冶金
烧结
复合材料
陶瓷
热力学
化学
物理
有机化学
作者
Y.H. Wang,Junzhan Zhang,Jianying Gao,Yang Zhang
摘要
Abstract In the field of ceramics, mullite has drawn plenty of attention due to its low thermal expansion and thermal conductivity as well as its high chemical stability and creep resistance. This work reported the mineral phase, liquid phase, and microstructure evolution of the sintered mullite, using coal‐series kaolin as the raw material and potash feldspar as well as phosphorus pentoxide as additives. The effects of K 2 O and P 2 O 5 on the content and viscosity of the liquid phase in mullite were calculated using FactSage 8.1. The results showed that the introduction of K 2 O could inhibit the formation of cristobalite effectively. Adding K 2 O and P 2 O 5 improved the content of the liquid phase formed during the calcination process. After introducing K 2 O and P 2 O 5 , mullite developed acicular and columnar structures, with average lengths of 9.76 and 7.97 µm, respectively. Furthermore, introducing K 2 O and P 2 O 5 improved the physical properties of mullite significantly.
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