Effects of alumina fiber content on microstructure and properties of alumina foam ceramics

다국어 초록 (Multilingual Abstract)

As a kind of heat insulating material, alumina foam ceramics have many advantages such as low thermal conductivity, highthermostable performance, good wear resistance, high hardness and excellent resistance to chemical corrosion. In this paper,a high-alumina foam ceramic was prepared by the gel-foaming method using water as dispersing medium, aluminumdihydrogen phosphate as gel and alumina fiber as reinforcing component, and the effects of alumina fiber content on the slurryviscosity as well as the porosity, phase composition, microstructure and mechanical properties of the prepared ceramic werestudied. It was found that the viscosity of the slurry increased with the increase of fiber content. After sintering, there wereC-AlPO4, T-AlPO4 and α-Al2O3 phases in the prepared samples; with the increase of fiber content, the porosity increased firstand then decreased, whereas the compressive strength presented an opposite variation trend. In addition, the fracturetoughness was also improved owing to the bridging effect of alumina fibers, the crack deflection and the fiber pulling-outmechanism.

참고문헌 (Reference)

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