轻质高强度C/Al_2O_3复合气凝胶的制备及表征  

Synthesis and Characterization of Light and High-Strength C/Al_2O_3 Composite Aerogels

作　　者：仲亚[1] 张君君[1] 沈晓冬[1] 崔升[1] 孔勇[1] 滕凯明[1] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009

出　　处：《无机化学学报》2013年第2期319-325,共7页Chinese Journal of Inorganic Chemistry

基　　金：江苏省高校优势学科建设工程项目(PAPD);教育部"长江学者和创新团队发展计划"(IRT1146);国家安全重大基础研究(No.613120020020202);江苏省普通高校研究生科研创新计划(No.CXLX11_0344)资助项目

摘　　要：采用溶胶-凝胶法和CO2超临界干燥工艺制备RF/Al2O3复合气凝胶,再经高温热处理过程得到轻质高强度C/Al2O3复合气凝胶,研究了不同热处理温度对气凝胶结构的影响,利用氮气吸附、X射线衍射、扫描电子显微镜和透射电子显微镜等手段对气凝胶的结构和性能进行了分析并且测试了不同热处理温度样品的压缩强度。实验结果表明:C/Al2O3复合气凝胶具有均匀的三维网络结构且成块性好,随着热处理温度的升高,气凝胶比表面积和强度均先增大后减小,当1 400℃时,C/Al2O3复合气凝胶比表面积最高,为831 m2.g-1,压缩强度最大,为9.5 MPa。Resorcinol-formaldehyde/alumina composite （RF/Al2O3） aerogels were prepared using sol-gel techniques and supercritical fluid CO2 drying. RF/Al2O3 aerogels were successfully converted to light and high- strength carbon/alumina composite （C/Al2O3） aerogels after high temperature thermal treatment process. The effects of different thermal treatment temperature on the aerogels structures were studied. The structures and properties of aerogels were analyzed by means of BET, XRD, SEM, TEM and the compressive strengths were also measured. The experimental results showed that the as-synthesized C/Al2O3 aerogels with great monolithic morphology exhibited a three-dimensional network structure. With the increasing of thermal treatment temperature, both specific surface area and compressive strength of aerogels were first increase and then decrease. In particular, the C/Al2O3 aerogels treated by the thermal treatment temperature of 1 400 ℃ had the highest specific surface area and compressive strength （831 m2·g^-1 and 9.5 MPa, respectively）.

关 键 词：溶胶-凝胶 CO2超临界干燥 C Al2O3复合气凝胶 热处理 压缩强度 

分 类 号：O614.31[理学—无机化学] TB33[理学—化学]