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Structure and tribological behavior of Ni-B and Co-B galvanic coatings


The structure and tribological properties of Ni-B and Co-B galvanic coatings with boron concentration from 4 to 20 at % are investigated. The coatings containing over 8 at % B are shown to have amorphous structures. Ni-B and Co-B coatings with boron concentrations preceding the onset of amorphization (6–7.5 at %) possess optimal tribological properties under dry sliding. Coatings with metastable amorphous structure demonstrate the worst tribological behavior. An increase in boron concentration up to 20 at % stabilizes the amorphous structure and improves the wear resistance, microhardness, and thermal stability of the galvanic coatings in question.

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Correspondence to V. A. Kukareko.

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Original Russian Text © P.A. Vityaz’, V.A. Kukareko, L.S. Tsybul’skaya, Yu.N. Bekish, T.V. Gaevskaya, 2010, published in Trenie i Iznos, 2010, Vol. 31, No. 2, pp. 159–167.

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Vityaz’, P.A., Kukareko, V.A., Tsybul’skaya, L.S. et al. Structure and tribological behavior of Ni-B and Co-B galvanic coatings. J. Frict. Wear 31, 113–120 (2010).

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Key words

  • coating
  • amorphous structure
  • tribological behavior
  • boron