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Formation of titanium carbide on graphite via powder immersion reaction assisted coating

Authors
Journal
Materials Science and Engineering A
0921-5093
Publisher
Elsevier
Publication Date
Volume
396
Identifiers
DOI: 10.1016/j.msea.2005.01.011
Keywords
  • Graphite
  • Reactive Coating
  • Titanium Carbide
  • Reaction Kinetics

Abstract

Abstract The surface of graphite was modified employing powder immersion reaction assisted coating (PIRAC) method. Graphite plates were immersed into Ti powder and annealed at 800–1000 °C. Crystalline iodine was admixed to Ti powder in order to accelerate the transfer of Ti atoms onto the graphite surface. As a result of interaction between Ti and graphite, continuous Ti carbide coatings were formed with a thin layer of stiochiometric TiC on the graphite substrate/coating interface and Ti-rich TiC 1− x in the outer part of the coating with concentration of carbon decreasing towards the surface of the coating. The coating was found to grow by a parabolic law with the kinetic constant, k = 3.7 × 10 −8 exp(−160,000/ RT) m 2/s, the process being controlled by diffusion along fast diffusion paths. At low iodine concentrations and short exposures the amount of admixed iodine affected the rate of titanium carbide coating growth. A kinetic model of the process of coating growth is proposed.

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