第1期
Fabrication and Properties of Closed-pore Al2O3-based Refractory Aggregates
作者:YUAN Lei, YAN Zhengguo, ZHANG Xiaodong, YU Jingkun, ZHANG Shaowei
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卷号:
期号 : 2018 年, 第1期
页码:20 - 25
内容简介

A novel Al2O3-based refractory aggregate with closed-pore structure was fabricated utilizing superplasticity with submicro-sized Al2O3 and MgO as raw materials, and SiC as a high temperature pore-forming agent. The effect of MgO on porosity, phase composition and microstructure of the refractory aggregate has been investigated. For comparison, the common Al2O3-based refractory aggregates and porous ones with open-pore structure were also prepared. The results indicate that the closed porosity of Al2O3-based refractory aggregate increases as the content of MgO increases. When the content of MgO is 15 mass%, the closed and apparent porosities are 14.5% and 1.1%, respectively. The main phase compositions are Al2O3 and MgAl2O4. The formation mechanism of closed pores is that the finecrystalline-grain Al2O3 ceramic possesses superplastic deformation ability after adding MgO at high temperatures. When SiC powder is added to the Al2O3 ceramic, the generated gases by the reaction of SiC at the sintering temperature can provide a pressure to make grain boundaries slide. Then, the gases are enclosed by crystalline grains to form the closed pores. The slag corrosion resistance of the fabricated closed pore Al2O3-based refractory aggregate is better than the common refractory aggregate and porous ones. 

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