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首页> 外文期刊>Journal of Materials Engineering and Performance >Sintering, Microstructure, and Electrical Conductivity of Zirconia-Molybdenum Cermet
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Sintering, Microstructure, and Electrical Conductivity of Zirconia-Molybdenum Cermet

机译：氧化锆-钼金属陶瓷的烧结，微结构和电导率

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摘要

Monolithic zirconia-molybdenum (m-ZrO2/Mo) cermets of different compositions (5-40 vol.% Mo) and different initial Mo particles sizes (0.08-13 mu m) were prepared by traditional powder metallurgy process. The influences of metal content and initial particle sizes on the densification behavior, microstructure, and electrical conductivity of the cermets were studied. A percolation threshold value was obtained about 17.1 vol.% molybdenum fraction, above which a sharp increase in the electrical conductivity was observed. The temperature dependence of the electrical conductivity of cermets was studied. The cermet containing 5 vol.% Mo showed the ionic nature of the conductivity, while the metallic nature was observed in the samples of Mo fraction up to 16 vol.%. The activation of conductivity for ionic type of conductivity and the temperature coefficient of resistivity as well as the effect of porosity on electronic type conductivity are discussed.
机译：通过传统的粉末冶金工艺制备了不同组成（5-40％（体积）Mo）和不同初始Mo颗粒尺寸（0.08-13μm）的整体式氧化锆-钼（m-ZrO2 / Mo）金属陶瓷。研究了金属含量和初始粒径对金属陶瓷致密化行为，微观结构和导电率的影响。获得了约17.1vol。％的钼分数的渗滤阈值，在此之上观察到电导率急剧增加。研究了金属陶瓷电导率的温度依赖性。含有5vol。％Mo的金属陶瓷显示出导电性的离子性质，而在Mo含量高达16vol。％的样品中观察到金属性质。讨论了离子型电导率的电导率激活和电阻率温度系数，以及孔隙率对电子型电导率的影响。

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