掺杂TiO_2对硅气凝胶高温绝热性能的影响  

Influence of high-temperature insulation property of SiO_2 aerogels doped with TiO_2

作　　者：耿刚强[1] 张学舟[1] 赵永芳[1] 王宏震[1] 常姣姣[1] 孙登科[1] 

机构地区：[1]长安大学材料科学与工程学院,西安710061

出　　处：《化工新型材料》2014年第11期126-128,共3页New Chemical Materials

基　　金：2008国际科技合作项目<硅气凝胶复合绝热材料的孔结构控制及研究>(2008DFA51460)

摘　　要：以TiO2作为红外遮光剂,采用溶胶凝胶工艺,研究了遮光剂添加量、超声功率和时间、pH值等对硅气凝胶性能的影响,从而制备出具有高温绝热性能的硅气凝胶。利用扫描电子显微镜(SEM),BJH比表面积及孔结构测定,红外线光谱分析仪(FT-IR)等手段对所得样品进行表征。结果表明:当TiO2掺量为5%时,表观密度为0.122g/cm3,比表面积497.23m2/g,平均孔径24.8nm,孔隙率高达95%。To improve the high temperature insulation properties of SiO2 aerogels,we doped TiO2 as infrared opacifier,and used the technology of sol gel process to study the effect of additive amount of infrared opacifier, ultrasonic dis perse time and power,pH value on SiO2 aerogel insulation properties. Microstructure studies were carried out by Scanning Electron Microscopy （SEM） and nitrogen adsorption BJH analysis. Scattering and absorption infrared radiation ability was characterized by Fourier Transform Infrared （FTIR）. The result indicated that when the TiO2 quantify was 5 % the infrared transmittance will be greatly reduced, the apparent density was 0. 122g/cm^3 , the specific surface area is 497.23m^2/g and the average pore size was 24.80nm with porosity of 95%.

关 键 词：TiO2掺杂 硅气凝胶 高温绝热 

分 类 号：TQ427.26[化学工程]