Abstract
Scanning electron microscopy has provided direct evidence that microcracking occurs during the room-temperature abrasion and indentation of the SiC(W)/SiC composite. Based on a comparative study of five kinds of surface morphology, i.e. abraded surface, abraded and etched surface, fractured surface, polished surface and indented surface, examination of 5% SiC whisker-reinforced SiC specimens showed that the occurrence of microcracking is a consequence of grain boundary cracking resulting from the nature of this normally brittle material under pointed diamond indenters and irregularly shaped SiC abrasive particles. However, the feature of transgranular fracture and plastic deformation can also be observed on the fractured surface and worn surface respectively. A preliminary link between the microdamage to the abraded surface and the radial and lateral cracks on the indented surface is discussed.
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