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Abstract:
The microstructure and mechanical properties were studied for
ZrO2-Y2O3 alloys with 2mol% Y2O3 prepared by cold-isostatic pressing
(CIP) and pressureless sintering. The results show that Viker’s hardness
of the alloys decrease with the appearance of monoclinic phase (m-ZrO2)
and increase its content. Comparing with pure tetragonal phase (TZP),
the dual-phase (t+m) structure with microcracks possesses a much bigher
fracture toughness because there is only transformation-toughening
effect in the former, but a multiple mechanism of
transformation-toughening, microcrack-toughening, and residual stress
(strain)-toughening operates in the later.
关键词: 陶瓷 相变 显微裂纹 残余应力
Received
198906, received in revised form 199006
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