R.f. magnetron sputtered iridium coatings on carbon structural materials

K. Mumtaz, J. Echigoya, T. Hirai, Y. Shindo

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57 Citations (Scopus)

Abstract

R.f. magnetron sputtering was used to produced iridium coatings on carbon-carbon composite and isotropic graphites (coefficient of thermal expansion (CTE) approximately (0.92-7.6) × 10-6 K-1) at room temperature and 1073 K. Sputtered iridium coatings exhibit a homogenous surface irrespective of the deposition temperature. Extremely fine grained columnar structures of iridium were observed when deposited at room temperature. Compared with room temperature deposition, substrate firing at 1073 K produced denser coatings with less strains and larger grain size. Cracking was observed on the coating deposited at 1073 K in the case of c-c composite and isotropic graphite with a thermal expansion coefficient of approximately (0.92-4.8) × 10-6 K-1. For iridium coatings deposited onto isotropic graphite (CTE approximately 7.6 × 10-6 K-1) at 1073 K, after heat treatment at high temperatures in N2, there was no cracking, no outward diffusion of carbon, no dislocations and pores were reduced or eliminated.

Original languageEnglish
Pages (from-to)187-195
Number of pages9
JournalMaterials Science and Engineering A
Volume167
Issue number1-2
DOIs
Publication statusPublished - 1993 Aug 15

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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