Inter-diffusion of carbon into niobium coatings deposited on graphite Academic Article uri icon

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 2 C 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 Nb 2 C 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 D c into Nb 2 C and NbC layers as a function of temperature.

publication date

  • February 21, 2006