SiO_2-TiO_2-ZrO_2干凝胶制备工艺和性能  

Preparation process and properties of SiO_2-TiO_2-ZrO_2 series xerogels

作　　者：王黔平[1] 刘立红[1] 陈明华[1] 郭相雄 吴卫华[2] 张家生[2] 

机构地区：[1]河北联合大学材料科学与工程学院河北省无机非金属材料重点实验室,河北唐山063009 [2]河北联合大学图书馆,河北唐山063009

出　　处：《材料热处理学报》2013年第3期22-25,共4页Transactions of Materials and Heat Treatment

基　　金：河北省留学人员择优科技资助项目(20071127038);河北省自然科学基金项目(E201209048);唐山市科技研究与发展计划项目(20120301)

摘　　要：采用正硅酸乙酯(TEOS)、氧氯化锆(ZrOCl2.8H2O)和钛酸丁酯(TBT)为前躯体,以无水乙醇(EtOH)为溶剂通过溶胶-凝胶法制备以SiO2作为干凝胶主组分的SiO2-TiO2-ZrO2干凝胶。研究了多元干凝胶的溶胶-凝胶法制备技术、干凝胶改性技术以及各种制备工艺参数的影响规律。当原料比m(氧氯化锆)∶m(钛酸丁酯)∶m(氨水)∶m(TEOS)∶m(EtOH)=1∶2.7∶5.0∶16.7∶106.7时,经过水解、老化及溶剂替换后,制得气孔率约85%,比表面积190～210 m2/g,孔径6～30 nm,粒子直径小于20 nm,导热系数可达到0.0857 W.m-1.K-1的SiO2-TiO2-ZrO2干凝胶。Sol-gel method in which tetraethyl orthosilicate （ TEOS）, zirconium oxychloride （ ZrOC12·8H20 ） and tetrabutyl titanate （TBT） were used as precursors and ethyl alcohol（EtOH） as solvent, was applied to prepare SiO2-TiO2-ZrO2 xerogels. Preparing and modifying technique of xerogels was examined, and the preparing parameters were optimized. When the mass proportion of raw materials, ZrOC12 .8H2 O, TBT, NH3.H20, TEOS, and EtOH is 1：2. 7： 5. 0： 16. 7：10 6.7, SiO2-TiO2-ZrO2 xerogels is prepared through hydrolysis, aging and solvent replacement. The properties of the xerogel are as follows： porosity of 85% , specific surface area of 190-210 m2/g, pore size of 6-30 nm, particle diameter less than 20 nm and coefficient of thermal conductivity reaching to 0. 0857 W·m - 1· K-1

关 键 词：干凝胶 溶胶-凝胶法 SiO2-TiO2-ZrO2干凝胶 

分 类 号：TQ174[化学工程—陶瓷工业]