PHYSICAL, THERMAL, AND MECHANICAL PROPERTIES OF Al2O3-CaAl12O19 COMPOSITES PROCESSED BY IN-SITU REACTION SINTERING

Dwi Asmi, I. M. Low, B. H. O’Connor

Abstract


The physical, thermal, and mechanical characteristics of Al2O3-CaAl12O19 composites processed by in-situ reaction sintering are described.  The presence of CaAl12O19 phase in Al2O3 matrix has significant effect on the physical, thermal and mechanical properties of the final products. The porosity values increased rapidly for higher CaAl12O19 content, whereas the bulk density of the composite product decreased with increasing in CaAl12O19 content. The thermal expansion and densification behaviour results showed that the presence of CaAl12O19 phase hinders the processes of sintering and densification of alumina matrix. Although the presence of CaAl12O19 caused the reduction of hardness, the Al2O3-CaAl12O19 composites have improved fracture toughness when compared to alumina but not for CaAl12O19 exceeds 50 wt%.

Keywords: Al2O3-CaAl12O19 composites, in-situ reaction sintering, hardness, fracture, toughness


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