Effect of Direct Current Pulse Discharge on Electrical Resistivity of Copper and Iron Powder Compacts

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  • Yanagisawa Osamu
    Department of Materials Engineering, Faculty of Engineering, Hiroshima University
  • Matsugi Kazuhiro
    Department of Materials Engineering, Faculty of Engineering, Hiroshima University
  • Hatayama Tomei
    Department of Materials Engineering, Faculty of Engineering, Hiroshima University

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  • Effect of Direct Current Pulse Discharg

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The relationship between the number of pulses and the specific resistivity for the copper and iron powder compacts has been investigated to reveal the phenomena which are caused between powder particles in the early stage in the spark sintering process. The values of specific resistivity of the both powder compacts decrease with increasing the number of pulses, and the rates of decrease of specific resistivity increase with decreasing applied punch pressures. The limited variations of the relative densities of compacts are observed in the continuously pulse discharge process. Therefore, it is considered that the specific resistivity of compacts are decreased, not because their relative densities are changed but because the properties of the contact area between powder particles are changed by the pulse discharge. Where, this change of the properties is caused by the dielectric breakdown of the oxide film between the powder particle surfaces in the pulse discharge process. The metallic contact parts are created between the powder particles after this dielectric breakdown. It is suggested on the basis of the simple model of electric resistance of a compact that the fraction of the metallic contact area created by the dielectric breakdown of the oxide film is extremely small. Furthermore, it is assumed on the basis of the first order equation of the chemical reaction that the rate of the creation of the metallic contact area between powder particles per pulse discharge is proportional to the fraction of the contact area consisting of an oxide film between particles. The relationship between the number of pulses and the specific resistivity of compacts can be explained quantitatively by this assumption.

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