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The European Physical Journal D

, Volume 54, Issue 2, pp 185–188 | Cite as

Features of materials alloying under exposures to pulsed plasma streams

  • V. A. MakhlayEmail author
  • I. E. Garkusha
  • A. N. Bandura
  • O. V. Byrka
  • V. V. Chebotarev
  • V. D. Fedorchenko
  • A. V. Medvedev
  • V. I. Tereshin
Topical issue: 23rd Symposium on Plasma Physics and Technology

Abstract

Surface modifications and features of materials alloying under pulsed plasma exposures are investigated in this paper. The experiments were carried out with a pulsed plasma gun, which generates plasma streams with ion energies of up to 2 keV, a plasma density of (2–\(20)\times 10^{14}~{\rm cm}^{-3}\), an average specific power of 10 MW/cm2 and plasma energy densities in the range of (5–\(40)~{\rm J/cm}^{2}\). Nitrogen, helium, hydrogen, oxygen and different mixtures can be used as working gases. Modification of thin (1–2 μm) PVD coatings of molybdenum coating mixed with substrate in liquid phase under the pulsed plasma processing are analyzed. After alloying of ferritic/martensitic steel EP-823 with Mo the concentration of molybdenum in the modified layer of 15–20 μm achieved 20% for single treatment cycle and 30% after two cycles. Decrease of grain sizes (from tens of μm to hundreds of nm), roughness and porosity were obtained by plasma irradiation of thick (~0.1–0.3 mm) plasma sprayed coatings of Co-32Ni-21Cr-8Al-0.5Y and Ti64. A modified layer with homogeneous structure and thickness up to 50 μm is formed as a result of plasma treatment. Mechanisms of surface modification of WC-Co under irradiation with pulsed plasma streams of different ions are discussed.

PACS

52.40.Hf Plasma-material interactions; boundary layer effects 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • V. A. Makhlay
    • 1
    Email author
  • I. E. Garkusha
    • 1
  • A. N. Bandura
    • 1
  • O. V. Byrka
    • 1
  • V. V. Chebotarev
    • 1
  • V. D. Fedorchenko
    • 1
  • A. V. Medvedev
    • 1
  • V. I. Tereshin
    • 1
  1. 1.Institute of Plasma Physics of the NSC KIPTKharkovUkraine

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