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通过对Ti O N和Zr O N体系的热力学计算 ,绘制了Ti Zr O N系的热力学参数状态图 ,根据Ti和ZrO2 两相的稳定共存区确定了材料合成的热力学条件。采用常压烧结工艺制备了不同组分配比的Ti ZrO2 系金属陶瓷 ,研究了组成配比的变化对材料性能和显微结构的影响。结果表明 ,随着Ti含量的增加 ,材料的相对密度和抗弯强度均出现极小值 ,Ti含量在 5 0 %～ 75 % (体积分数 ,下同 )之间是材料的力学性能弱点区。Ti ZrO2 系金属陶瓷由金属Ti相 ,四方ZrO2 相和少量的单斜ZrO2 相组成 ,Ti的存在能促进四方ZrO2 向单斜ZrO2 的马氏体相变过程 ,合成条件下组元Ti和ZrO2 之间不发生化学反应 ,具有良好的化学相容性。
Through thermodynamic calculation of Ti O N and Zr O N system, the thermodynamic parameters of Ti Zr O N system were plotted. According to the stable coexistence of Ti and ZrO2, the thermodynamic conditions of Ti Zr O N system were determined. Ti ZrO2 cermets with different compositions were prepared by atmospheric sintering. The effect of composition ratio on the properties and microstructure of the composites was investigated. The results show that with the increase of Ti content, the relative density and flexural strength of the material all show a minimum, and the content of Ti is between 50% and 75% (volume fraction, the same below) is the weak point of the mechanical properties of the material. The Ti ZrO2 cermet consists of a metal Ti phase, a tetragonal ZrO2 phase and a small amount of monoclinic ZrO2 phase. The presence of Ti can promote the martensitic transformation of the tetragonal ZrO2 to monoclinic ZrO2. Under the conditions of the synthesis, Ti and ZrO2 Between no chemical reaction, has good chemical compatibility.