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HomeMaterials Science ForumMaterials Science Forum Vol. 816Influence of the Metal Particle Size and Sintering...

Influence of the Metal Particle Size and Sintering Process on the Electrical Resistivity of m-ZrO₂/30%Mo Cermet

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Abstract:

Monolithic zirconia-molybdenum (m-ZrO₂/Mo) cermets have been prepared by traditional powder metallurgy process with molybdenum volume concentration of 30% and different molybdenum powders with average particle sizes of 80nm, 3μm, 8μm and 13μm. The influence of metal particle size on the morphology and electrical conductivity of the cermet has been investigated. The electrical resistivity of the cermet was measured via 4-probe DC technique from 500 °C to 1600 °C. All the samples showed the positive temperature coefficient of electrical resistivity, but the sample prepared with 80 nm molybdenum powder showed very high resistivity over 0.5 Ω·cm. Hot-press sintering was proved to be helpful to the elongated conductive phase formation, thus the electrical conductivity of cermet increased compared to the pressureless sintering process.

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Periodical:

Materials Science Forum (Volume 816)

Pages:

205-209

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.816.205

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Online since:

April 2015

Authors:

Yan Ling Guo, Hai Zhao, Lei Tang, Yao Jie Wang, Jie Yu Zhang

Keywords:

Composite Materials, Electrical Resistivity, Microstructure, Molybdenum, Sintering, Zirconia

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