Fabrication of Fibrous Mullite-alumina Ceramic with High Strength and Low Thermal Conductivity  

作　　者：YANG Mengmeng LUO Xudong YI Jian ZHANG Xiaofang PENG Zijun 杨孟孟;罗旭东;YI Jian;ZHANG Xiaofang;PENG Zijun(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China;Ningbo Institute of Industrial Technology,Chinese Academy of Science,Ningbo 315201,China)

机构地区：[1]School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China [2]Ningbo Institute of Industrial Technology,Chinese Academy of Science,Ningbo 315201,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2019年第6期1415-1420,共6页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(No.51772139)

摘　　要：Optimizing highly porous fibrous ceramics, like bird’s nest structure, were obtained by vacuum impregnation method with mullite fibers and alumina sol as raw material. The influences of impregnation cycles on the property of the sample, such as porosity, compressive strength and room-temperature thermal conductivity were explored. The experimental results show that the 3D skeleton structure of the sample was constructed by the randomly arranged mullite fibers and inorganic particles. The content of alumina can be adjusted effectively by impregnation times and it increases with increasing impregnation cycles. The thermal conductivity and compressive strength can also be controlled via tailored impregnation cycles. The compressive strength of fibrous ceramic ranged from 1.03 MPa to 5.31 MPa, while the porosity decrease slightly from 85.3% to 73.8%. In the same time, the thermal conductivity increase from 0.037 W/(m·K) to 0.217 W/(m·K), indicating that the fibrous ceramic with high impressive and low thermal conductivity can be fabricated by impregnation method.Optimizing highly porous fibrous ceramics, like bird’s nest structure, were obtained by vacuum impregnation method with mullite fibers and alumina sol as raw material. The influences of impregnation cycles on the property of the sample, such as porosity, compressive strength and room-temperature thermal conductivity were explored. The experimental results show that the 3D skeleton structure of the sample was constructed by the randomly arranged mullite fibers and inorganic particles. The content of alumina can be adjusted effectively by impregnation times and it increases with increasing impregnation cycles. The thermal conductivity and compressive strength can also be controlled via tailored impregnation cycles. The compressive strength of fibrous ceramic ranged from 1.03 MPa to 5.31 MPa, while the porosity decrease slightly from 85.3% to 73.8%. In the same time, the thermal conductivity increase from 0.037 W/(m·K) to 0.217 W/(m·K), indicating that the fibrous ceramic with high impressive and low thermal conductivity can be fabricated by impregnation method.

关 键 词：fibrous mullite-alumina materials CERAMIC 3D skeleton structure alumina sol thermal conductivity 

分 类 号：TQ174.1[化学工程—陶瓷工业]