发泡–注凝成型法制备自结合莫来石多孔陶瓷  

Preparation of Self–bonded Mullite Porous Ceramics by Foam-gelcasting Method

作　　者：邓先功 韦婷婷[1] 冉松林 韩磊[2] 张海军[2] 张少伟[2] 

机构地区：[1]安徽工业大学材料科学与工程学院,安徽马鞍山243002 [2]武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉430081 [3]安徽工业大学冶金减排与资源综合利用教育部重点实验室,安徽马鞍山243002

出　　处：《硅酸盐学报》2017年第12期1803-1809,共7页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金面上项目(51672194和51472184);湖北省教育厅优秀中青年科技创新团队计划项目(T201602);安徽省大学生创新创业训练计划(201710360186)资助

摘　　要：以莫来石粉为原料、Al_2O_3和SiO_2粉体为莫来石自结合相起始原料、Isobam 104为分散剂和黏结剂、十二烷基硫酸三乙醇胺为发泡剂和羧甲基纤维素钠为稳泡剂,采用发泡–注凝成型工艺结合反应烧结法制备了自结合莫来石多孔陶瓷。研究了自结合相粉体的用量对浆料流变性能和胶凝性能的影响,并对所制备自结合莫来石多孔陶瓷的物相组成、显微结构、线收缩率、孔隙率和机械性能进行了表征。结果表明:随着自结合相粉体用量从0%增至50%(质量分数)时,所制备莫来石多孔陶瓷的孔隙率、球形气孔孔径逐渐增加,而其线收缩率和机械强度逐渐降减小。当自结合相粉体的用量为40%时,所制备的孔隙率约为76.6%(体积分数)、球形气孔孔径约为565μm、线收缩率仅为13.8%的莫来石多孔陶瓷的耐压强度和抗折强度仍分别可达7.9和4.0 MPa。Self-bonded mullite porous ceramics were prepared by foam–gelcasting combined reaction sintering method using mullite powders as main raw materials, Al2O3 and SiO2 powders as starting materials of self-bonded mullite, Isobam 104 as a dispersing/gelling agent, triethanolamine lauryl sulfate as a foaming agent, and sodium carboxymethyl cellulose as a foam stabilizing agent. The effect of self-bonded phase content on the rheological properties and gelling behaviors of the slurries was investigated. The phase composition, microstructures, linear shrinkage ratio, porosity and mechanical properties of the resultant porous samples were characterized. The results show that the porosity and the average spherical pore size of as-prepared porous ceramics increase, while their linear shrinkage ratio and mechanical strength decrease with increasing the self-bonded phase content from 0% to 50%（in mass fraction）. When the content of self-bonded phase is 40%, the compressive strength and flexural strength of as-prepared porous sample with the porosity of 76.6%（in volume fraction）, average spherical pore size of 565 μm and linear shrinkage ratio of 13.8% are 7.9 MPa and 4.0 MPa, respectively.

关 键 词：自结合莫来石多孔陶瓷 发泡–注凝成型 反应烧结 线收缩率 

分 类 号：Q174[生物学—水生生物学]