Fabrication of Fibrous Mullite-alumina Ceramic with High Strength and Low Thermal Conductivity
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2019年第6期
论文作者：杨孟孟 罗旭东 YI Jian ZHANG Xiaofang PENG Zijun
文章页码：1415 - 1420
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.
杨孟孟1,2，罗旭东1，YI Jian2，ZHANG Xiaofang1，PENG Zijun1
1. School of Materials and Metallurgy, University of Science and Technology Liaoning2. Ningbo Institute of Industrial Technology, Chinese Academy of Science
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.
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