Growth and structure of TiCxNy coatings chemically vapour deposited on graphite substrates


EROĞLU Ş. , Gallois B.

JOURNAL OF MATERIALS SCIENCE, vol.32, no.1, pp.207-213, 1997 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 32 Issue: 1
  • Publication Date: 1997
  • Doi Number: 10.1023/a:1018560107109
  • Title of Journal : JOURNAL OF MATERIALS SCIENCE
  • Page Numbers: pp.207-213

Abstract

TiCxNy coatings were grown on graphite substrates in a computer-controlled, hot-wall chemical vapour deposition (CVD) reactor, using gas mixtures of TiCl4-CH4-N-2-H-2 at a total pressure of 10.7 kPa (80 torr) and at a temperature of 1400 K. Growth rate, composition, morphology and crystallographic texture of the TiCxNy coatings were investigated as a function of the CH4/CH4 + N-2 ratio in the range 0-1 at a constant CH4 + N-2 flow rate of 370 standard cubic centimeters per minute (seem). The C/C + N ratio and growth rate of the TiCxNy coatings increased with increasing CH4/CH4 + N-2 ratio in the gas phase. The compositions of the coatings with C/C + N ratios in the range 0-1 were found to be between the thermodynamic and the kinetic predictions. Morphology and preferred orientation of the coatings were observed to be strongly affected by the CH4/CH4 + N-2 ratio in the gas phase.