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The influence was investigated of ceria addition and the grain size on ageing and wear behaviour of Y-TZP ceramics. Two types of ceramics were studied: ZY5 (95 mole% ZrO 2 and 5 mole% YO 15 ) and ZY4Ce4 (92 mole% ZrO 2 , 4 mole% YO 15 , and 4 mole%CeO 2 ). Each ceramic was sintered with grain sizes of 0 18 μm (95% dense) or 0 5 μm (98%...