烧结次数对30Mo-ZrO_2金属陶瓷结构及导电性能的影响

Effect of Sintering Times on Microstructure and Electrical Property of 30Mo-ZrO_2 Cermet

采用粉末冶金方法以钼粉和氧化锆粉为原料制备30Mo-ZrO_2金属陶瓷,研究烧结次数对金属陶瓷微观结构和高温电导率的影响。结果表明,烧结次数为3次的试样密度最大(6.41 g/cm^3),高温电导率最高(1 600℃时电导率为12.50×10^(-3)S/cm);增加烧结次数能改变粉体颗粒形态,提高金属陶瓷致密度,降低孔隙率,提高导电相的相对体积分数,增加材料电导率;金属陶瓷电导率随着温度升高而增大,变化幅度随着温度的升高而增加。

The 30Mo-ZrO_2 cermet was prepared using Mo powder and ZrO_2 powder as raw materials by powder metallurgy.The effect of sintering times on electrical properties and the microstructure of samples were investigated.The results indicate that,when the sample is sintered 3 times,there is a maximum density of 6.41 g/cm^3 and the maximum high-temperature electrical conductivity value of about 12.50×10^（-3）S/cm.When increasing sintering times,the morphology of particle changes,the density of the cement increase,the porosities of the cement decrease,the volume fraction of the conductive phase increases and the electric conductivity of the cements also increases;when raising sintering temperature,the electrical conductivity of the cement increases,and the amplitude of variation increases gradually with the increase of the temperatures.