微硅粉原位合成莫来石制备高强度多孔陶瓷材料  

Preparation of Porous High Strength Mullite Ceramics by In-situ Method Utilizing Silica Fume

作　　者：王涛[1] 铁生年[1] 汪长安[1,2] 

机构地区：[1]青海大学非金属材料研究所,西宁810016 [2]清华大学材料学院,北京100084

出　　处：《硅酸盐通报》2013年第11期2244-2248,共5页Bulletin of the Chinese Ceramic Society

摘　　要：本文用微硅粉和工业氧化铝粉为起始原料,马铃薯淀粉为造孔剂,通过原位反应烧结工艺制备了高强度多孔莫来石陶瓷材料。研究了不同烧结温度,不同淀粉含量对合成莫来石多孔陶瓷工艺影响。结果表明:以优化起始原料Al2O3/SiO2摩尔比为3∶2.5,淀粉含量40 wt%,在1450℃温度下烧结样品孔隙率为36.07%、体积密度为2.02g/cm3时、热导率为1.40 W·m-1·K-1,折强度达到79.91 MPa,莫来石纯度达95wt%。该工艺研究产品的研发为提高微硅粉附加值提供技术支撑。An in situ reaction-sintering technique was taken to prepare porous mullite ceramics from silica fume and Al2O3, using potato starch as the pore former. The effects of sinter temperature and starch content on mullite were investigated. As a conclusion, the values of porosity, bulk density, thermal conductivity, rupture strength and mullite content are 36.07% , 2.02 g/cm3, 1.40 W . m-1·K-1, and 79.91 MPa, 95wt% , respectively, for the sintered samples of 1450℃ and 40wt% starch. The research provides a technology support for the value-added silica fume.

关 键 词：微硅粉 淀粉 板条状 莫来石 原位合成 

分 类 号：TQ174[化学工程—陶瓷工业]