五价钽、锂掺杂对Y-TZP微观结构和性能的影响

在前人工作的基础上，本文作者进一步深入细致地分析了总结了Ｎｂ２Ｏ５和Ｔａ２Ｏ５对Ｙ－ＴＺＰ微观结构和宏观性能的影响并提出了自己的见解，研究发现Ｎｂ２Ｏ５和Ｔａ２Ｏ５的添加使得Ｙ－ＴＺＰ轴比及热膨胀各向异性增大，马氏体相变起努温度升高，可相变，ｔ－ＺｒＯ２含量上升有利于材料机械性能的提高。

The Influence of Pentavalent Transition Metal Oxide on the Microstructure and Properties of Y-TZP

On the basis of several other scientists' work,the s made a further intensive and careful investigation about the influence of Nb2O5 and Ta2O5 on the microstructure and macroproperties of Y-TZP,and thus put forwards some unique opinions of his own.It was found that the addition of Nb2O5 and Ta2O5 increased the tetragonality and the thermal anisotropy of Y-TZP crystal.Further more,the starting temperature of the t-ZrO2m-ZrO2 martensitic transformation was raised.Due to the increase of this temperature,the thermodynamic driving force for this transfomation was enhanced and the transformable t-ZrO2 fraction under the influence of crack-tip stress field was increased,which was helpful for the improvement of the fracture toughness.And because of the solid solution of Ta5+ and Nb5+,which were small in cation radius and big in electric charge,in zirconia crystal lattice,Zr-O band strength was increased and so did the fracture strength of the ceramics as a whole.