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Contribution of electrospark alloying to the oxidation resistance of hard tungsten alloys

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Powder Metallurgy and Metal Ceramics Aims and scope

Abstract

The paper examines the contribution of electrospark alloying to the oxidation resistance of hard tungsten alloys. It is established that the oxidation of carbides results from their electronic structure. When WC and hard tungsten alloys are heated to 1000°C, a brittle scale consisting of WO3 and CoWO4 rapidly forms. The oxidation resistance reduces as follows: TiC → Co → W → HTA (if TiC is more than 10%) → WC-Co → WC. The oxidation rate of hard tungsten alloys may be a criterion of their serviceability. It is shown that the oxidation resistance of hard tungsten alloys becomes much higher after their electrospark alloying with aluminum, titanium, and chromium and with wear-resistant composite TsLAB-2 ceramics based on the ZrB2-ZrSi2-LaB6 system with Ni-Cr-Al (30 mole%) binder.

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Authors and Affiliations

  1. Institute for Materials Science, Khabarovsk Scientific Center, Far-Eastern Department, Russian Academy of Sciences, Khabarovsk

    A. D. Verkhoturov & L. A. Konevtsov

  2. Komsomol’sk-on-Amur State Technical University, Russia

    A. M. Shpilev

  3. Institute of Chemistry, Primorsk Scientific Center, Far-Eastern Department, Russian Academy of Sciences, Vladivostok

    P. S. Gordienko & E. S. Panin

  4. Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kiev

    I. A. Podchernyaeva & A. D. Panasyuk

Authors
  1. A. D. Verkhoturov
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  2. A. M. Shpilev
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  3. P. S. Gordienko
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  4. L. A. Konevtsov
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  5. E. S. Panin
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  6. I. A. Podchernyaeva
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  7. A. D. Panasyuk
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Translated from Poroshkovaya Metallurgiya, Vol. 47, No. 1–2 (459), pp. 145–150, 2008.

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Verkhoturov, A.D., Shpilev, A.M., Gordienko, P.S. et al. Contribution of electrospark alloying to the oxidation resistance of hard tungsten alloys. Powder Metall Met Ceram 47, 112–115 (2008). https://doi.org/10.1007/s11106-008-0015-2

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  • DOI: https://doi.org/10.1007/s11106-008-0015-2

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