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一、前言 适当控制部分稳定ZrO_2(PSZ)陶瓷的冷却过程,合理选择高温特效的条件,可令c~*-ZrO_2基相中的t~(**)-ZrO_2沉淀相处于既保持至室温,又便于向m-ZrO_2相转变的状态;从而提高材料的增韧和强化效果。若在亚共析温度区进行时效,m~(***)-ZrO_2现将出现在晶界处;富MgO的δ相(Mg_2Zr_5O_(12))畴将在c/t相界面上优先成核,并导至c-ZrO_2晶格收缩,从而在基体中形成应力场。这将有利于应力诱发相变的发生,可望改善材料的力学性能。本
I. INTRODUCTION Proper control of the cooling process of partially stabilized ZrO 2 (PSZ) ceramics and the reasonable selection of the conditions of high temperature special effects allow the t ~ (**) - ZrO 2 precipitate in the c ~ * -ZrO 2 phase to be maintained at room temperature, And easy to m-ZrO_2 phase transition state; thereby enhancing the material toughening and strengthening effect. If the aging in the sub-eutectoid temperature region, m ~ (***) - ZrO_2 will now appear in the grain boundary; rich MgO δ phase (Mg_2Zr_5O_ (12)) domain will preferentially nucleate in the c / t phase interface , And lead to c-ZrO 2 lattice shrinkage, thus forming a stress field in the matrix. This will be conducive to the occurrence of stress-induced phase transformation, and it is expected to improve the mechanical properties of the material. this