高气孔率及高强度多孔氧化铝陶瓷的制备(英文)  

FABRICATION OF POROUS ALUMINA CERAMICS WITH HIGH POROSITY AND HIGH STRENGTH

作　　者：刘伟渊[1] 汪长安[1] 周立忠[1] 黄勇[1] 

机构地区：[1]清华大学材料科学与工程系,新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《硅酸盐学报》2008年第12期1764-1768,共5页Journal of The Chinese Ceramic Society

基　　金：“863”计划(2007AA03Z435)资助项目

摘　　要：在叔丁醇、丙烯酰胺、氧化铝组成的超低固相含量的浆料体系中,研究了分散剂、pH值等参数对浆料流变学性能的影响规律。采用柠檬酸作为分散剂、pH值约为6时,体积分数为10%的Al2O3浆料具有最低的黏度。利用叔丁醇极易挥发的特点,采用凝胶注模的工艺,制备了高气孔率及高强度的多孔氧化铝陶瓷,研究了固相含量和烧结温度对气孔率和压缩强度的影响规律,当气孔率为74%时,多孔氧化铝陶瓷的压缩强度在8 MPa以上。In an ultra low solid loading slurry system constituted oftert-butyl alcohol, acrylamide and alumina powder, the influences of different dispersants and pH values on the slurry rheology were investigated. When the dispersant is citric acid with a pH value of around 6, alumina slurry with 10% （in volume） solid loading exhibits the lowest viscosity. Since tert-butyl alcohol is extremely easy to volatilize, porous alumina ceramics with high porosity and high strength were successfully fabricated by the gel-casting method. The effects of solid loading and sintering temperature on the porosity and compressive strength were also researched. The compressive strength of sintered alumina ceramics with 74% porosity can over 8 MPa.

关 键 词：叔丁醇 凝胶注模 多孔陶瓷 氧化铝 

分 类 号：TQ174[化学工程—陶瓷工业]