溶胶-凝胶过程影响堇青石结晶行为的因素  

Factors affecting crystallization behavior of cordierite by Sol-gel

作　　者：周爱军[1] 卢琪[1] 万香港[1] 付艳梅[1] 

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430074

出　　处：《武汉工程大学学报》2012年第6期13-17,共5页Journal of Wuhan Institute of Technology

摘　　要：为了研究影响堇青石结晶行为的因素,以Mg(NO3)2.6H2O、Al(NO3)3.9H2O、正硅酸乙酯为原料,根据堇青石的化学式2MgO.Al2O3.5SiO2,按照配比制成溶胶,利用溶胶-凝胶法制备堇青石粉末,并利用X射线衍射、差示扫描热量法等测试手段对堇青石粉末进行表征.测试结果表明,煅烧温度和凝胶预处理温度对堇青石的结晶行为有直接的影响,当干凝胶的预处理为500℃,煅烧温度为1 200℃时,出现明显的α-堇青石晶相.Cordierite is widely used with its low thermal expansion coefficient, dielectric constant and high ther- mal shock resistance. In order to study the factors affecting the cordierite crystallization behavior, cordierite crystalline powder was prepared according to the cordierite chemical formula （2MgO·2Al2O3·5SiO2 ）, and Mg（ NO3 ）2·6H2 O, Al（ NO3 ）3·9H2O, tetraethyl orthosilicate （TEOS） were used as the raw materials to get the sol- gel, then the gel was calcined at different temperature to obtain the cordierite powder. The structure and the composition of the cordierite power were characterized with the X - ray diffraction （XRD） and differen- tial scanning calorimetry （DSC） techniques. The results show that the pretreatment and calcination temperature has a direct influence on the cordierite crystallization behavior. When the pretreatment temperature is 500 ℃ and the calcination temperature is 1 200 ℃, alpha- cordierite phase is obtained.

关 键 词：堇青石 溶胶-凝胶法 结晶行为 

分 类 号：TQ17[化学工程—硅酸盐工业]