硅溶胶粘结法制备氧化铝多孔陶瓷  

Preparation of Porous Alumina Ceramics by Silica Solution Bonding Method

作　　者：姚森 林洪玉 曾小州 庄艳红 李晨雨 黎阳[1] YAO Sen;LIN Hongyu;ZENG Xiaozhou,;ZHUANG Yanhong;LI Chenyu;LI Yang(School of Materials and Architectural Engineering, Guizhou Normal Universtiy, Guiyang 550025, Guizhou, China)

机构地区：[1]贵州师范大学材料与建筑工程学院

出　　处：《陶瓷学报》2019年第3期325-329,共5页Journal of Ceramics

基　　金：贵州师范大学大学生创新训练项目(2018520158);贵州师范大学博士科研启动基金;贵州省教育厅自然科学研究项目(2015]363);国家自然科学基金项目(51462004)

摘　　要：以电熔Al2O3微粉为骨料、碱性硅溶胶为高温粘结剂、羧甲基纤维素为成型黏结剂,通过模压成型法制备了Al2O3多孔陶瓷,研究硅溶胶含量与烧成温度对Al2O3多孔陶瓷线收缩率、抗折强度、微观形貌、孔隙率等性能的影响。结果表明:随着硅溶胶含量的增加,烧成Al2O3多孔陶瓷的线收缩率逐渐增加,孔隙率逐渐降低,抗弯强度呈递增趋势。当硅溶胶含量占Al2O3粉体质量的5%-15%时,在1250 ℃-1350 ℃的烧成温度范围内,可获得具有优异孔隙率的Al2O3多孔陶瓷,其孔隙率为27.8%-40.1%;而当硅溶胶的含量达20%时,大量石英型SiO2晶体的生成降低了Al2O3多孔陶瓷的力学性能与孔隙率。Porous alumina ceramics were prepared by molding method with fused alumina micron powder as aggregate, alkaline silica solution as high temperature binder and carboxymethycellulose as molding promoter. The effect of silica solution content and sintered temperature on linear shrinkage, flexural strength, microstructure and porosity of the porous ceramics were investigated. Results indicated that the linear shrinkage and flexural strength increased with silica solution content, while the porosity decreased. When the silica solution content was 5%-15% with the sintered temperature from 1250 ℃-1350 ℃, the porous ceramics had an excellent porosity, and the porosity was about 27.8%-40.1%. When the silica solution surpassed 20%, the superabundant silica crystal derived from the solution degraded the flexural strength and porosity.

关 键 词：硅溶胶 氧化铝多孔陶瓷 粘结剂 二氧化硅 

分 类 号：TQ174.75[化学工程—陶瓷工业]