1. Effects of sintering temperature on properties of porous mullite/corundum ceramics
- Author
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Yang, Fengkun, Li, Cuiwei, Lin, Yamei, and Wang, Chang-An
- Subjects
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SINTERING , *TEMPERATURE effect , *POROUS materials , *MULLITE , *CORUNDUM , *CERAMIC materials , *STRENGTH of materials , *THERMAL conductivity , *MICROSTRUCTURE , *GELCASTING - Abstract
Abstract: 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°C, linear shrinkage increased from 2.6 to 9.5%, porosity decreased from 81 to 78%, bulk density increased from 0.59 to 0.69g/cm3, compressive strength increased from 3.1 to 11.7MPa and thermal conductivity increased from 0.14 to 0.35W/m·K. Porous microstructure was complex, where large spherical pores contained small cellular pores on their internal walls. [Copyright &y& Elsevier]
- Published
- 2012
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