Inter-diffusion of carbon into niobium coatings deposited on graphite

S. Barzilai, A. Raveh, N. Frage

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26 Scopus citations

Abstract

The inter-diffusion of carbon (originating from a graphite substrate) into a niobium coating and the fabrication of its carbides by heat treatment in the temperature range of 1073-1773 K was studied. The thickness of the Nb 2C and NbC phases formed after heat treatment as well as the inter-diffusion coefficients for the formation of the carbide layers were also studied. It was found that the carbide layer growth displayed parabolic behavior patterns inherent in the growth rate constants (K) of Nb2C and NbC layers. By assuming that the inter-diffusion coefficients are independent of concentration, it was possible to determine the inter-diffusion coefficients of carbon Dc into Nb2C and NbC layers as a function of temperature.

Original languageEnglish
Pages (from-to)450-456
Number of pages7
JournalThin Solid Films
Volume496
Issue number2
DOIs
StatePublished - 21 Feb 2006

Keywords

  • Carbides
  • Carbon
  • Diffusion
  • Niobium
  • Sputtering

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