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Specific features of obtaining molybdenum-nickel coatings on diamonds

  • Theory and Technology of Sintering, Heat Treatment, and Thermomechanical Treatment
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Soviet Powder Metallurgy and Metal Ceramics Aims and scope

Conclusions

Formation of the molybdenum-nickel coatings is determined mainly by the reactions occurring between carbon and molybdenum oxides developed during the reduction process of nickel oxide in the presence of molybdenum. In contrast to the metallizing process of diamonds in the oxidized molybdenum powder, metallizing in a NiO + Mo mixture is distinguished by the fact that all other things being equal, a continuous thick layer forms earlier and the active process of its weight increment continues for a longer time. This can be attributed to the catalytic effect of active (reduced) nickel on the reactions of reduction and carbide formation. Reduction reactions of molybdenum in the presence of active carbon (forming due to the dissociation of CO at the surface of the finely dispersed nickel) are assumed to occur. They are expected to contribute to the weight increment of the coating. During the stage of oxygen loss in the metallizing agent (τ > 2 h), this becomes the main process and is determined mainly by the carbide composition of the external layers of the coating.

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Authors and Affiliations

  1. Institute for the Problems of Materials Science, Academy of Sciences, Ukraine, Kiev

    V. G. Chuprina, I. M. Shalya & V. V. Shurkhal

Authors
  1. V. G. Chuprina
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  2. I. M. Shalya
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  3. V. V. Shurkhal
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Translated from Poroshkovaya Metallurgiya, No. 6(354), pp. 23–28, June, 1992.

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Chuprina, V.G., Shalya, I.M. & Shurkhal, V.V. Specific features of obtaining molybdenum-nickel coatings on diamonds. Powder Metall Met Ceram 31, 479–484 (1992). https://doi.org/10.1007/BF00802443

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  • DOI: https://doi.org/10.1007/BF00802443

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