反应烧结法制备六铝酸钙多孔材料  

Preparation of porous calcium hexaluminate by reaction-sintering

作　　者：李天清[1] 李楠[1] 李友胜[1] 

机构地区：[1]武汉科技大学高温陶瓷与耐火材料湖北省重点实验室

出　　处：《耐火材料》2004年第5期309-311,323,共4页Refractories

摘　　要：以轻质碳酸钙和工业氧化铝为原料 ,采用反应烧结工艺制备了六铝酸钙多孔材料 ,并借助XRD和SEM等手段研究了煅烧温度 (130 0℃、14 0 0℃、15 0 0℃、16 0 0℃ )、炭黑加入量 (0～ 4 0 % )对多孔材料的显微结构和性能的影响。研究表明 :制备六铝酸钙多孔材料的最佳煅烧温度为 15 0 0℃ ;添加炭黑可以改变六铝酸钙多孔材料的显微结构 ,随着炭黑加入量的增加 ,六铝酸钙片状晶体的厚度减小 ,多孔材料的气孔率增加 ,耐压强度下降。考虑到实际应用中对多孔材料的耐压强度的要求 ,炭黑的加入量不宜超过 2 0 %。Porous calcium hexaluminate(CA 6) was prepared from industrial alumina and lightweight calcium carbonate powders calcined at 1300 ℃,1400 ℃,1500 ℃ and 1600 ℃ for 3 h respectively.The influences of calcining temperature and carbon black addition(0～40%)on the microstructure and physical properties of the porous CA 6 were investigated by XRD and SEM.The results indicate that the optimal calcining temperature of porous CA 6 is about 1500 ℃,and the microstructure of the materials can be adjusted by the addition of carbon black.With the increase of the addition of carbon black,the thickness of planar CA 6 grains decreases,the apparent porosity of the porous materials increases and the cold crushing strength reduces correspondingly.According to the demand for the strength of porous materials,the addition of carbon black should be less than 20wt%.

关 键 词：反应烧结法 碳酸钙 氧化铝 六铝酸钙多孔材料 制备 煅烧温度 炭黑 显微结构 

分 类 号：TQ175.7[化学工程—硅酸盐工业]