Abstract
Abstract Previous studies have shown that the addition of SiC nanoparticles to Al 2 O 3 changes the fracture mode from intergranular to transgranular and in doing so improves the wear resistance. The reason for this is not clear but a change to the grain boundary chemistry caused by impurities such as C added with the SiC may be involved. The aim of the current study was to investigate the influence of small amounts of C doping on the fracture mode and wear properties of Al 2 O 3 . The microstructure and properties of Al 2 O 3 doped with 0 and 0.012 wt% C were studied. Al 2 O 3 showed mainly intergranular fracture. The addition of 0.012 wt% C to Al 2 O 3 changed the fracture mode to mainly transgranular. The wear resistance improved and the percentage of surface grains pulled out was lower compared to pure Al 2 O 3 .
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