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Variation of the electrical resistivity of sintered materials of the Ni-Cr-alloy/magnesia system with temperature

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Soviet Powder Metallurgy and Metal Ceramics Aims and scope

Conclusions

  1. 1.

    With rise in temperature the electrical resistivity of MgO/80% Ni-20% Cr cermets at first increases and then, after attaining a certain temperature (T∘max), begins to fall. The position of the maximum on the resistivity vs temperature curve is determined by the initial resistivity of the cermets and on the conductivity of their semiconducting phase; for cermets with resistivities of 1–20 Ω-cm, it lies in the range 350–100°C.

  2. 2.

    The stability of the electrical resistivity of the cermets at elevated temperatures in air falls with increasing resistivity. Cermets with resistivities of the order of 1–10 Ω-cm are capable of operating for a long time in a stable manner in air as heating elements at temperatures of up to 250–300°C.

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Literature cited

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Authors and Affiliations

  1. V. I. Lenin Belorussian State University, USSR

    S. P. Tolochko, A. A. Vecher & I. F. Kononyuk

Authors
  1. S. P. Tolochko
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  2. A. A. Vecher
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  3. I. F. Kononyuk
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Additional information

Translated from Poroshkovaya Metallurgiya, No. 6(186), pp. 39–42, June, 1978.

The authors wish to thank S. S. Yashchuk and É. M. Shpilevskii for assistance with some tests.

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Tolochko, S.P., Vecher, A.A. & Kononyuk, I.F. Variation of the electrical resistivity of sintered materials of the Ni-Cr-alloy/magnesia system with temperature. Powder Metall Met Ceram 17, 443–446 (1978). https://doi.org/10.1007/BF00795798

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  • DOI: https://doi.org/10.1007/BF00795798

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