(1. 北京科技大学 物理化学系， 北京 100083;
2. 山东轻工学院 无机材料系，济南 250100)
摘 要: 通过对TiON和ZrON体系的热力学计算，绘制了TiZrON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TiZrO2 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50%～75%(体积分数， 下同)之间是材料的力学性能弱点区。 TiZrO2 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。
关键字: TiZrO2 体系；金属陶瓷； 热物理性能； 相变； 显微结构
（1. Department of Physics and Chemistry, University of Science and Technology Beijing，Beijing 100083， P.R.China;
2. Department of Inorganic Materials, Shandong Institute of Light Industry，Ji′nan 250100， P.R.China）
Abstract:The coexisting region of Ti and ZrO2 has been determined by thermodynamic calculation to determine the synthesis conditions of this composite. TiZrO2 system composites with different compositions sintered under ordinary pressure have beenprepared by powder metallurgical method. The effects of titanium volume fraction on the density， the thermophysical properties and the microstructures of this composite have been studied carefully. The correlation between the microstructures and the corresponding properties were characterized by means of XRD， SEM， EDS， TEM and so on. The results of XRD and TEM show that the combining state of phases between Ti and ZrO2 is physical in this composite. The phase composition consists of titanium， tetragonal zirconia and a little monoclinic zirconia.
Key words: Ti ZrO2 system; cermet; phase transformation; microstructure
