期刊
MATERIALS LETTERS
卷 73, 期 -, 页码 36-39出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2011.12.087
关键词
Ceramics; Porous materials; Thermal properties; Microstructure
资金
- National Natural Science Foundation of China [90816019, 51102012]
- Beijing Natural Science Foundation
- Fundamental Research Funds for the Central Universities
In this paper, porous mullite/corundum ceramics with high porosity, high strength and low thermal conductivity were fabricated by foam-gelcasting method using fused mullite powder as raw material. Effects of sintering temperature on linear shrinkage, bulk density, apparent porosity, compressive strength and thermal conductivity of the porous mullite/corundum ceramics were researched. As sintering temperature increased from 1350 to 1550 degrees C, linear shrinkage increased from 2.6 to 9.5%, porosity decreased from 81 to 78%, bulk density increased from 0.59 to 0.69 g/cm(3), compressive strength increased from 3.1 to 11.7 MPa and thermal conductivity increased from 0.14 to 0.35 W/m.K. Porous microstructure was complex, where large spherical pores contained small cellular pores on their internal walls. (C) 2012 Elsevier B.V. All rights reserved.
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