Abstract
Owing to the low thermal expansion coefficient and high temperature resistance, porous Al2TiO5 ceramic is a promising candidate for use in high temperature gas purifier, diesel tail gas processor and catalyst support. However, full potential of Al2TiO5 has been limited because of two disadvantages: low thermal stability and poor mechanical property. In this paper, Al2TiO5–mullite composite porous ceramics reinforced by hexagonal single crystal α-Al2O3 platelets were fabricated by reaction sintering method using γ-AlOOH, TiO2 and SiO2 as raw materials and Fe2O3 as modifying agent. Phase compositions, apparent porosity and microstructure of the Al2TiO5–mullite composite porous ceramic are examined. The effect of α-Al2O3 platelets on mechanical strength of the composite porous ceramic was investigated extensively. It was found that with the addition of α-Al2O3 platelets, the compressive strength and flexural strength of the Al2TiO5–mullite composite porous ceramic can be significantly improved.
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