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Physicomechanical properties of volume-strained sintered porous nickel

I. Electrical resistivity

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Soviet Powder Metallurgy and Metal Ceramics Aims and scope

Conclusions

  1. 1.

    The extent to which re-pressing affects the total electrical resistance of a porous sintered material depends on the quality of the starting interparticle contacts. With perfect starting contacts, re-pressing has virtually no effect upon the resistance of a specimen; with partly imperfect starting contacts (higher porosity, lower sintering temperature), the resistance falls after re-pressing as a result of a decrease in screen resistance; with poor starting contacts, the resistance may grow as a result of their partial destruction (structural deformation).

  2. 2.

    It is suggested that the electrical-resistance method can be successfully employed for ascertaining whether the pressing of powders and the re-pressing of sintered compacts is accompanied by structural deformation and for determining the extent of this phenomenon.

  3. 3.

    The contact resistance in pressings and re-pressed compacts sharply falls after annealing at 200–400°C, and after annealing at 600°C interparticle contacts become perfect from an electrical standpoint. The sintering of new contacts formed during re-pressing is identical with the sintering of interparticle contacts established during the pressing of powder.

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Literature cited

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Authors and Affiliations

  1. Institute of Materials Science, Academy of Sciences of the Ukrainian SSR, Ukraine

    I. F. Martynova, V. V. Skorokhod & S. M. Solonin

Authors
  1. I. F. Martynova
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  2. V. V. Skorokhod
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  3. S. M. Solonin
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Additional information

Translated from Poroshkovaya Metallurgiya, No. 8(152), pp. 79–83, August, 1975.

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Martynova, I.F., Skorokhod, V.V. & Solonin, S.M. Physicomechanical properties of volume-strained sintered porous nickel. Powder Metall Met Ceram 14, 671–674 (1975). https://doi.org/10.1007/BF00794472

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  • DOI: https://doi.org/10.1007/BF00794472

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