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Effects of Sintering Time on Microstructure and Properties of Alumina Foam Ceramics

Z. Chu, Z. Chu, C. Jia, C. Jia, J. Liu, J. Liu, R. Ding, R. Ding, G. Yuan

Journal of Ceramic Science and Technology, Vol. 8, No. 4 (2018), pp. 499-504

DOI: 10.4416/JCST2017-00028

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Abstract

As heat insulating materials, alumina foam ceramics possess many advantages such as low thermal conductivity, high thermostability, good wear resistance, high hardness, and excellent resistance to corrosion. In this paper, a high-alumina foam ceramic was prepared with the gel-foaming method using aluminum dihydrogen phosphate as gel, and alumina fibers as reinforcing component. The effects of sintering time on phase components, fiber surface morphology, microstructure, and mechanical properties of the samples were investigated. It was found that C-AlPO4 with higher temperature stability demonstrated higher crystallinity, and increasing sintering time facilitated the conversion of T-AIPO4 to C-AIPO4. Meanwhile, the porosity first decreased with time followed by an increase, and the compressive strength increased first and then decreased. When the sintering time is 4 h, the optimized compressive strength reached 4.3 MPa. So, the best sintering time is 4 h.

Keywords

Foam ceramics, alumina fibers, microstructure, compressive strength

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