WEI Han ¹, WANG Juntao ¹, CHEN Songlin ^{1, 2}, YUAN Lin ¹, LIU Xijun ¹, LIU Shifan ²
(1. Ruitai Materials Technology Co., Ltd., China Building Materials Academy, Beijing 100024, China; 2. Yixing Refractory Co., Ltd.,
Yixing 214265, Jiangsu, China)

Abstract: 9 porosity models, whose porosity ratios are 23%, 30% and 40%, and porosity diameters are 0.023 mm, 0.041mm, and 0.054mm,respectively, were designed in order to study the porosity effect of the magnesium alumina spinel refractory on its temperature field and thermal stresses field. The temperature distribution, temperature gradient, and thermal stress were calculated by using Ansys analysis software.Results indicate that the heat dissipation rate of the spinel decreases with the increase of the porosity ratio or the increase of the pore diameter.When the porosity is constant, the temperature gradient and thermal stress of the spinel decrease with the increase of the pore diameter; when the pore diameter is constant, the temperature gradient and thermal stress of the spinel increase with the increase of the porosity ratio.

Key words: magnesia alumina spinel; pore; cooling speed; thermal stress; temperature gradient