Processing and characterisation of Al₂O₃SiO₂ZrO₂ composite material
by G. Mebrahitom Asmelash; O Mamat
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 7, No. 1, 2012

Abstract: An oxide ceramic based composite of Al₂O₃SiO₂ZrO₂ (ASZ) system was developed and investigated using a pressureless sintering route. The effect of compositions of each component on the microstructure, density, and hardness properties were studied. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to investigate the phase composition of ASZ composite system. The results showed that with varying ZrO₂ content, keeping the silica content constant and the alumina as a matrix, the densification tends to decrease as the content of zirconia increases starting from 10 wt. % of the composition. XRD peaks suggested a fully developed alumina, mullite and zirconia phases formed by the solid and liquid phase reaction sintering. The experimental results reveal also the hardness value was in the range of 10-12.5 GPa, the highest value for a composition of 80%wt. Al₂O₃-10%wt. SiO₂-10%wt. ZrO₂.

Online publication date: Mon, 12-Mar-2012

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