期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 699, 期 -, 页码 511-516出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.01.007
关键词
Fibrous ceramics; Aerogel; Thermal properties; Mechanical properties; Thermal insulation
资金
- National Natural Science Foundation of China [11672031, 11472038]
- Fundamental Research Fund for the Central Universities [2014RC047]
- China Scholarship Council
A new lightweight and thermal insulating material was successfully prepared by impregnating Al2O3 SiO2 aerogel into a porous mullite zirconia fiber network with a quasi-layered microstructure. The microstructures, thermal and mechanical properties of the porous mullite zirconia ceramics were investigated before and after the impregnating of Al2O3-SiO2 aerogel. It was observed that the mullite and zirconia fibers combined well with aerogels. Compared with fibrous porous mullite-zirconia ceramics, the Al2O3-SiO2 aerogel/porous mullite zirconia composite exhibited higher compressive strength (i.e. 136 MPa in the z direction) and lower thermal conductivity (i.e. 0.052 Wi(m . K)). The present work provides an efficient way to fabricate highly porous ceramics with high strength and ultra low thermal conductivity, which find potential use in high-temperature thermal insulation materials. (C) 2017 Elsevier B.V. All rights reserved.
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