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High-temperature metallographic investigation of the sintering of reduced copper powders

  • Theory and Technology of Sintering, Thermal, and Chemicothermal Treatment Processes
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Soviet Powder Metallurgy and Metal Ceramics Aims and scope

Conclusions

  1. 1.

    Using the technique of high-temperature metallography, a study was made of the sintering behavior of reduced copper powders. It was established that the temperature range corresponding to the formation and growth of metallic contacts between powder particles depends on the reduction temperature of the powder.

  2. 2.

    On the basis of experimental data on contact growth, a quantitative evaluation is made of the coefficients of surface self-diffusion and energy of activation. It is shown that the effective coefficient of surface self-diffusion for a copper powder reduced at a low temperature is an order of magnitude greater than that for a copper powder reduced at a high temperature.

  3. 3.

    It was found that the effective value of activation energy for the process of contact growth between reduced copper powder particles does not remain constant as a function of sintering temperature. With rise in sintering temperature, the effective value of activation energy increases as a result of an improvement in the structural equilibrium attained in the surface layers of particles in such powders.

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Authors and Affiliations

  1. Kuibyshev Aviation Institute, USSR

    G. I. Aksenov, A. N. Logvinov & I. A. Drozdov

Authors
  1. G. I. Aksenov
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  2. A. N. Logvinov
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  3. I. A. Drozdov
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Translated from Poroshkovaya Metallurgiya, No. 1 (85), pp. 45–51, January, 1970.

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Aksenov, G.I., Logvinov, A.N. & Drozdov, I.A. High-temperature metallographic investigation of the sintering of reduced copper powders. Powder Metall Met Ceram 9, 37–41 (1970). https://doi.org/10.1007/BF00796946

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  • DOI: https://doi.org/10.1007/BF00796946

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