Preparation and properties of 4.25Cu-0.75Ni/NiFe2O4 cermet |
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摘 要: |
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关 键 词: | NiFe2O4 金属陶瓷 预加工 惰性阳极 |
收稿时间: | 18 May 2004 |
修稿时间: | 20 August 2004 |
Preparation and properties of 4.25Cu-0.75Ni/NiFe2O4 cermet |
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Authors: | Li Jie Zhang Gang Lai Yan-qing Tian Zhong-liang and Qin Qing-wei |
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Affiliation: | (1) School of Metallurgical Science and Engineering, Central South University, 410083 Changsha, China |
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Abstract: | 4.25Cu-0.75Ni/NiFe2O4 cermets were prepared by doping NiFe2O4 ceramic matrix with the mixed powders of Cu and Ni or Cu-Ni alloy powder as the electrical conducting metallic elements.
The effects of technological parameters, such as the adding modes of metallic elements, the ball milling time, the sintering
time and the sintering temperature, on the relative density and resistivity of the cermets were studied. The results show
that the resistivity of 4.25Cu-0.75Ni/NiFe2O4 cermets decreases with increasing temperature, and has a turning point at 590 °C, which is similar to that of NiFe2O4 ceramic. The sintering temperature and adding modes of metallic elements have a great influence on the properties of 4.25Cu-0.75Ni/NiFe2O4 cermets. When the sintering temperature increases from 1200 °C to 1300 °C, the relative density increases from 89.86% to
95.33%, and the resistivity at 960 °C decreases from 0.11 Ω · cm to 0.03 Ω · cm, respectively. When the metallic elements
are added with the mixed powders of Cu and Ni, the cermets of finely and uniformly dispersed metallic phase, high density
and electric conductivity are obtained. The relative density and resistivity at 960 °C are 90.23% and 0.04 Ω · cm respectively
for the cermet samples sintered at 1200 °C for 2 h, which are both better than those of the cermets prepared under the same
technique conditions but with the metallic elements added as 85Cu-15Ni alloy powders.
Foundation item: Project (G1999064903) supported by the National Key Fundamental Research and Development Program of China; project(2001AA335013)
supported by the National High Technology Research and Development Program of China; project (50204014) supported by the National
Natural Science Foundation of China |
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Keywords: | NiFe2O4 cermet preparation property inert anode |
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