凝胶注模工艺制备莫来石泡沫陶瓷  

Preparation of Mullite Foam Ceramics by Gelcasting

作　　者：苏鹏[1,2] 郭学益[1] 冀树军[1,2] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083 [2]包头铝业集团有限责任公司,包头014046

出　　处：《天津大学学报》2008年第12期1492-1497,共6页Journal of Tianjin University(Science and Technology)

基　　金：中国铝业公司2007年科技基金资助项目(2007KJA08);包头市科技局2006年重点产学研项目(2007Q1005)

摘　　要：采用凝胶注模工艺，在陶瓷浆料发泡的基础上，通过有机单体的原位聚合固化制备莫来石泡沫陶瓷．研究了工艺条件对纯单体溶液、发泡和未发泡悬浮浆料等不同体系聚合反应的影响．聚合反应过程的温度变化曲线分析表明，单体溶液或浆料的pH值、初始温度和组成对其聚合反应有显著影响．制备的泡沫陶瓷为开孔贯通泡沫体，体积密度为理论密度的8%-40％，气孔率可达到90％以上，平均孔径范围和孔径分布范围分别为50-300μm和30-800μm显微结构分析表明，泡沫陶瓷平均孔径和孔径分布取决于聚合反应引发时间和泡沫陶瓷体积密度．Gelcasting process, based on the foaming of aqueous ceramic suspension and subsequent solidification of the structure by in-situ polymerization of organic monomers, was introduced in the research for the preparation ofmullite foam ceramics. Parameters affecting the kinetics of different polymerization systems were investigated in systems containing the separate components of a ceramic solution, formed or unformed. Analysis of the temperature curves reveals that the onset of polymeric reactions is apparently affected by pH value, initial temperature and composition. The resulting foam ceramics consisted of a highly interconnected network of spherical cells with density 8%-40% of theoretical value and porosity above 90%. The mean pore size and its distribution of sintered foam ceramics were dependent both on the induction time of polymerisation and the bulk density of the specimen, and ranged from approximately 50 to 300 μm and 30 to 800 μm respectively.

关 键 词：泡沫陶瓷 莫来石 凝胶注模 引发时间 平均孔径 

分 类 号：TQ174.15[化学工程—陶瓷工业]