Abstract
This chapter describes a ceramic wear mode map in order to predict two wear modes in unlubricated self-mated sliding of ceramic. Specific wear amount and friction coefficient are observed in unlubricated self-mated sliding of Al2O3, ZrO2, and SiC. Two types of wear surfaces are recognized: in type I, wear generates a smooth surface. In type II, wear generates a rough wear surface. The wear surface of type I is observed when specific wear amount is smaller than about 10-6 mm-3/Nm, and the wear surface of type II is observed when specific wear amount is larger than about 10 -6 mm3/Nm. So called mild wear corresponds to the wear of type I, and severe wear of type II is generated by having surface crack propagation in a brittle manner. In general, mild wear is considered to be a practically useful wear mode without lubrication.
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