二步法制备轻质六铝酸钙的研究  

The Light Weight Calcium Hexaluminate Preparation Research

作　　者：石健[1,2] 严云[1,2] 胡志华[1,2] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]西南科技大学四川省非金属复合材料与功能材料重点实验室,省部共建国家重点实验室培育基地,四川绵阳621010

出　　处：《非金属矿》2016年第4期14-16,共3页Non-Metallic Mines

基　　金：国家高技术研究发展计划(863)(2011AA06A106)

摘　　要：采用水热合成和低温煅烧二步法工艺,以工业氢氧化铝和氢氧化钙制备轻质六铝酸钙,研究了水热处理温度对六铝酸钙的生成及性能的影响。结果表明:前驱体中三水铝石转变为薄水铝石的温度为175℃,水热处理是轻质六铝酸钙材料生成的重要因素。在1450℃保温3 h,制备出体积密度为0.61 g/cm^3,孔隙率为79.36%的轻质六铝酸钙材料。A new fabrication process （so called two-steps methods, e.g. autoclaved firstly, and then calcined） has been developed. Lightweight calcium hexaluminate （CA6） were synthesized by this new process using Ca（OH）2 and AI（OH）3 as raw materials in this paper. The temperature of the hydrothermal synthesis was investigated that affects the various performances of calcium hexaluminate. The results show that： hydrothermal treatment at 175 ℃, gibbsite translated into boehmite. Hydrothermal treatment is the most important factor for the growth of the light calcium hexaluminate. Light calcium hexaluminate can be synthesized after calcined at 1450 ℃ for 3 h, which achieves density of 0.61 g/cm3, porosity of 79.36%.

关 键 词：二步法 薄水铝石 轻质六铝酸钙 水热处理 

分 类 号：TQ175[化学工程—硅酸盐工业]