Mechanical behaviour and wear resistance of Ce-PSZ alumina matrix composites

Abstract

Transformation toughening is one of the methods for improving the strength of alumina which has a hardness value of similar to2000 HV. In this study, 0wt.%, 5wt.%, 15wt.%, 25wt.% and 35wt.% of Ce-partially stabilised ZrO2 powders were dispersed homogeneously in alumina powder matrix. Pure alpha-Al2O3 and alpha-Al2O3/ZrO2 mixtures were shaped by using slip casting method and then they were sintered at 1550degreesC. Specimens were tested in order to determine apparent porosity and bulk density, micro-hardness, flexural strength and fracture toughness. Later, wear tests were carried out on specimens by using 60 and 120 mesh abrasive papers, 64.5N, 33.3N and 14.4N loads. By this procedure, the effects of composition, load and mesh size of abrasive paper on abrasive wear behaviour was inspected throughly. Finally, surface analyses were carried out by using SEM to determine the characteristics of worn specimens.