发泡法制备硅藻土多孔陶瓷及性能研究  

Preparation and properties of porous diatomite ceramics via foam-gelcasting

作　　者：韩磊[1] 梁峰[1] 王军凯[1] 邓先功[1] 张海军[1] Han Lei Liang Feng Wang J unkai Deng Xiangong Zhang Haijun(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Sci- ence and Technology, Wuhan 43008], Hubei, Chin)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081

出　　处：《耐火材料》2017年第5期334-338,共5页Refractories

基　　金：国家自然科学基金面上项目(51472184;51472185和51502216);湖北省教育厅高等学校优秀中青年科技创新团队计划(T201602)

摘　　要：为了改善多孔陶瓷的隔热性能,以工业硅藻土为原料,Isobam-104为分散剂和结合剂,羧甲基纤维素钠为稳泡剂,十二烷基硫酸三乙醇胺为发泡剂,通过发泡注浆成型工艺制备了硅藻土多孔陶瓷,并研究了烧成温度(分别为1 100、1 150、1 200和1 250℃)对其性能的影响。结果表明:随着烧成温度的提高,所制备多孔陶瓷的显气孔率逐渐降低,耐压强度逐渐增大;当烧成温度为1 100℃时,多孔陶瓷的显气孔率和耐压强度分别为84.5%和1.11 MPa;当烧成温度增至1 200℃时,试样的显气孔率和耐压强度分别为83.4%和2.01 MPa,其在200℃下的热导率为0.105 W·m^(-1)·K^(-1),具有较好的隔热性能。综合考虑硅藻土多孔陶瓷的各项性能认为,其最佳烧成条件为1 200℃保温2 h。In order to improve the insulation performance of porous ceramics, porous diatomite ceramics were prepared via the foam-gelcasting method using commercial diatomite as raw material,lsobam-104 as the dispersant and binder,and carboxymethylcellulose sodium as a pore stabilizing agent. Dependence of properties of fired porous ceramics on firing temperature（1100, 1150,] 200 and 12,50 0（3） was investigated. The results show that with the increase of the firing temperature,the porosity of the as-prepared porous ceramics gradually reduces,but the compressive strength increases. The specimen fired at 11O0℃ with 84.5% of porosity has a compressive strength of 1. 11 MPa. In addition,the specimen fired at 1200℃ with 83.4% of porosity has a higher compressive strength of 2.01 MPa and shows a thermal conductivity of O. 105 W. m^-1·K^-1 ,exhibiting a good thermal insulation property. Considering various properties of porous diatomite ceramics,the optimum firing conditions is 1 200℃ for 2 h.

关 键 词：硅藻土 多孔陶瓷 发泡法 热导率 

分 类 号：TQ175.75[化学工程—硅酸盐工业]