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Influence of Kyanite Content on Microstructures and Properties of Castables Containing Spherical Lightweight Mullite Aggregates
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作者 WANG Yueyue YAN Wen LI Nan 《China's Refractories》 CAS 2017年第2期39-43,共5页
Five lightweight mullite castables were prepared using the lightweight mullite aggregate(M45A) with narrow particle size distribution and spherical shape,mullite powder(M45P),kyanite powder,microsilica and Secar 7... Five lightweight mullite castables were prepared using the lightweight mullite aggregate(M45A) with narrow particle size distribution and spherical shape,mullite powder(M45P),kyanite powder,microsilica and Secar 71 cement as raw materials. After the specimens fired at 1100 ℃,1200 ℃ and 1300 ℃ for 3h,respectively,the effects of kyanite contents( 8%,10%,12%,14%,16% by mass) on the physical properties,phase composition and microstructures were investigated through an X-ray diffractometer( XRD),a scanning election microscopy( SEM) and a microscopy measurement method,etc. The results show that,for the specimens fired at 1300 ℃ with the kyanite content from 8%to16%, the bulk densities and apparent porosities change little,but the cold modulus of rupture and the crushing strengths decrease significantly,and the linear change rates increase from-0.87% to 0.64%. The most apposite mode is the specimen containing 12% kyanite fired at 1300 ℃, which has a high crushing strength of 29.3 MPa,a low linear change of 0.18%,an apparent porosity of 36.8% and a bulk density of 1.73 g/cm^3. 展开更多
关键词 spherical lightweight mullite aggregate kyanite content lightweight castable microstructure physical property
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Properties of Castables Made of Spherical Lightweight Mullite Aggregates
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作者 ZHAO Hua ZHAO Fei +1 位作者 ZHANG Qianqian GE Tiezhu 《China's Refractories》 CAS 2019年第3期22-26,共5页
The castables were prepared from spherical lightweight mullite aggregates,bauxite,SiO2 fine powder,α-Al2O3 fine powder and calcium aluminate cement.The performance changes of the castables were studied after heat tre... The castables were prepared from spherical lightweight mullite aggregates,bauxite,SiO2 fine powder,α-Al2O3 fine powder and calcium aluminate cement.The performance changes of the castables were studied after heat treatment at 110℃for 24 h,1100℃for 3 h,1200℃for 3 h and 1300℃for 3 h.The results illustrate that the cold modulus of rupture and hot modulus of rupture of the castable increase with the rising heat treatment temperature.The cold crushing strength shows a“V”change trend when the heat treatment temperature rises from 1100 to 1300℃.After the specimen is heat treated at 1300℃,the thermal conductivity is 0.500 W·m-1·K-1,0.586 W·m-1·K-1,0.595 W·m-1·K-1 at 300,600 and 900℃,respectively.The SEM analysis explains the change trends of these properties.The prepared lightweight mullite castables can be applied as the working lining of hot-blast furnaces. 展开更多
关键词 spherical lightweight mullite aggregates CASTABLE thermal conductivity
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