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 ℃.
出处
《耐火材料》
CAS
北大核心
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)
