耐高温ZrO_2/SiO_2复合气凝胶的制备及表征  

Preparation and characterization of heat-resistant zirconia/silica composite aerogel

作　　者：邹文兵[1] 沈军[1] 祖国庆[1] 邹丽萍[1] 吴宇[1] 关大勇[1] 张蓉艳 姚献东 

机构地区：[1]同济大学波耳固体物理研究所上海市特殊人工微结构材料与技术重点实验室,上海200092 [2]纳诺科技有限公司,浙江绍兴312000

出　　处：《南京工业大学学报（自然科学版）》2016年第2期42-46,共5页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家科技支撑计划(2013BAJ01B01);国家自然科学基金(U1230113);浙江省重大专项(2014C11SA600010)

摘　　要：以锆酸四丁酯为锆源,采用溶胶-凝胶法结合化学液相沉积(CLD),即在凝胶老化过程中用部分水解的锆酸四丁酯和正硅酸四乙酯进行液相修饰,经过乙醇超临界干燥(SCFD)制备耐高温ZrO_2/SiO_2块体复合气凝胶。采用透射电子显微镜(TEM)、傅里叶红外光谱仪(FT-IR)、X线衍射仪(XRD)、N_2吸附分析仪等仪器表征了ZrO_2/SiO_2复合气凝胶的形貌、表面基团、晶相和孔结构,着重研究其耐热性能。结果表明:制备的ZrO_2/SiO_2复合气凝胶具有优秀的耐温性能,1 000℃处理2 h后,仍为四方相,线收缩率仅为12%,比表面积高达186 m2/g。Heat-resistant monolithic zirconia / silica composite aerogels were prepared by using zirconium n-butoxide as precursor via sol-gel route combined with chemical liquid deposition（ CLD）,and supercritical fluid drying（ SCFD）. Zirconia wet gels were modified with partially hydrolyzed zirconium nbutoxide and tetraethoxysilane during aging. Transmission electron microscope（ TEM）,Fourier transform infrared spectroscope（ FT-IR）,X-ray diffraction（ XRD）,and N_2 adsorption analyzer were used to characterize the morphology,surface groups,phases,pore structure,and thermal properties. The obtained composite aerogel exhibited excellent heat resistance remained in the tetragonal phase at 1 000 ℃ for 2h. Its linear shrinkage was about 12% and the specific surface area was as high as 186 m^2/ g.

关 键 词：ZrO2/SiO2复合气凝胶 溶胶-凝胶法 化学液相沉积 耐高温 

分 类 号：TQ127.2[化学工程—无机化工]