Al_2O_3-SiO_2纳米复合粉体材料的超临界制备及其性能  

Preparation of Al_2O_3 -SiO_2 nanometer composite powder by supercritical technology

作　　者：赵惠忠[1] 计道珺[1] 雷中兴[1] 汪厚植[1] 张文杰[2] 

机构地区：[1]武汉科技大学纳米材料与技术中心,武汉430081 [2]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》2003年第2期69-74,共6页Refractories

基　　金：武汉市科技计划项目 (2 0 0 110 0 70 88)

摘　　要：采用sol gel法和超临界流体干燥技术合成了Al2 O3-SiO2 纳米复合粉 ,并研究了该复合粉经不同温度处理后的显微结构形貌、比表面积、孔容分布、物相变化及分形维数等的变化规律。结果表明 :热处理温度直接影响粉体的显微结构特征 ,并决定其比表面积、孔容和分形维数 ;该复合粉体材料的莫来石化温度为 10 15℃左右。Al 2 O 3 -SiO 2 nanometer composite gel powder was synthesized by sol gel and super critical fluid drying(SCFD) process,and the gel powders were heat treated at different temperatures from 500 ℃ to 1300 ℃.The microstructure,specific surface area,pore distribution,phase transformation and fractal dimension were studied.The results demonstrate that the microstructure character of the powders is affected by different heat treatment temperatures,and the specific surface area,pore volume and the fractal dimension of the samples are also affected by the heat treatment temperature consequently.The initial mullitization temperature in the Al 2 O 3 -SiO 2 nanometer composite obviously decreased to 1015 ℃.

关 键 词：A1203-Si02纳米复合粉体材料 超临界流体干燥 SOL-GEL法 制备 性能 莫来石 

分 类 号：TQ175.712[化学工程—硅酸盐工业]