中文摘要：

采用通用有效介质（GEM）计算了Mo-ZrO2金属陶瓷电导率,研究了组分、温度和孔隙率对金属陶瓷电导率的影响。结果表明Mo-ZrO2金属陶瓷与ZrO2相体积分数可用GEM方程进行描述,Mo-ZrO2金属陶瓷的临界体积分数为0.158,方程指数t为2.506。GEM方程计算的金属陶瓷的电导率结果与实际测量结果基本一致。在Mo金属相含量较高时,金属陶瓷的电导率随温度的升高而降低,金属陶瓷的电导率变化主要受Mo金属相电导率变化的影响;在Mo金属相含量较低时,金属陶瓷呈现Mo金属相电子导电和与ZrO2陶瓷相离子导电的混合导电机制。金属陶瓷的相对密度或孔隙率对导电率有很大影响,提高烧结温度和延长保温时间,可提高金属陶瓷的电导率。

英文摘要：

Using general effective media （GEM） equation, the electrical conductivity of Mo-ZrO2 cermet was calculated. The effects of component, temperature and porosity of cermet on the electrical conductivity of the cermet were investigated. The results show that the GEM equation give very good consistency with the measured. The model proves to be promising for Mo-ZrO2 cermet. The fraction corresponding to the percolation threshold is 0.158, and the system-specific parameter is 2.506. While the Mo content is higher, the electrical of cermet increases with increasing temperature. The trend that the electrical conductivity of cermet changed with temperature is the same as the trend that the electrical conductivity of Mo changed with temperature. While the Mo content is lower, the electrical conductivity of cermet is the electrical conductivity and the ionic conductivity of mixed-conductive mechanism. The results also indicate that the relative sintered density or porosity has obvious influence on the electrical conductivity of Mo-ZrO2 cermet. Increasing sintering time and enhancing the sintering temperature can lead to samples more compact in the structure, and thus enhance the electrical conductivity of Mo-ZrO2 cermet.