3Y—TZP多晶材料密度,断裂相变与力学性能的相互关系

通过对不同密度的Ｙ－ＴＺＰ（钇稳定四方相氧化锆多晶体）材料的力学性能（强度、韧性及硬度）和断裂时相变性能的研究，发现材料的相对密度不仅直接影响其力学性能，而且影响断裂时断口四方相向单斜相的相变量，材料密度越高，相变量越大，材料密度和断裂时断口相变量共同决定了材料的力学性能。

CO-RELATIONSHIP BETWEEN SINTERED DENSITY, FRACTURE-INDUCED PHASE TRANSFORMATION AND THE MECHANICAL PROPERTIES OF 3Y-TZP CERAMICS

Y-TZP ceramics of different sintered densities were prepared and studied of their mechanical properties(fracture strength, fracture toughness and Vicker's hardness). The investigation show that the sintered density not only affect the mechanical properties directly, but also affeCt the phase composition(tetragonal content vs monoiclinic) of the material and the phase transformation volume from tetragonal to monochinic induced during fracture. Higher densities result in higher tetragonal content and phase transformation volume during fracture. The mechanical properties of the 3Y-TZP ceramics are therefore found to be determined both by the sintered density and the fracture-induced phase transformation volume.