纳米孔莫来石陶瓷材料的制备  

Fabrication of Nanoporous Mullite Ceramics

作　　者：王冬冬[1] 王刚[1] 孙小飞[1] 凌亚平[1] 丁书强[1] 李红霞[1] 

机构地区：[1]中钢集团洛阳耐火材料研究院有限公司,先进耐火材料国家重点实验室,洛阳471039

出　　处：《无机化学学报》2012年第3期491-494,共4页Chinese Journal of Inorganic Chemistry

基　　金：国家“863”(No.2009AA032503);国家自然科学基金青年基金(No.51002145);国家“973”(No.2010CB735810)资助项目

摘　　要：以正硅酸乙酯（TEOS）提供硅源、纳米氧化铝（d90=50 nm）提供铝源,通过溶胶-凝胶法与超临界干燥技术,制备了分散纳米氧化铝的SiO2气凝胶块体,所得复合气凝胶块体经1200℃、1300℃热处理后,得到了纳米孔莫来石陶瓷材料。XRD测试表明：凝胶体在1 200℃热处理后发生了莫来石化,1300℃莫来石化基本完成。压汞仪与场发射扫描电镜结果显示：凝胶块体经1 200、1 300℃热处理后,形成了具有纳米多孔结构的莫来石陶瓷材料,其骨架结构包含有200~400 nm的大孔,以及大量位于其孔壁上的6~30 nm的介孔。由于莫来石化的进行,热处理后的陶瓷材料的纳米孔结构具有更高的热稳定性。The silica aerogels composited with alumina nano-particles were prepared by sol-gel method and supercritical drying technique,using TEOS and alumina nano-particles as the precursors.The nanoporous mullite materials were obtained by the calcination of the aerogel monoliths at 1 200 and 1 300 ℃,and were characterized by means of XRD,FESEM and mercury porosimetry.The results of XRD indicate that mullitization appears after calcination at 1 200 ℃.The results of mercury porosimetry and FESEM show that mullite ceramic materials possess porous microstructure with the pore size of 200~400 nm and 6~30 nm.Owing to the mullitization,the porous microstrcture of mullite ceramic materials has higher thermal stability.

关 键 词：溶胶-凝胶 莫来石化 纳米孔 莫来石陶瓷 

分 类 号：TB383[一般工业技术—材料科学与工程]