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Plasma Chemistry and Plasma Processing

, Volume 31, Issue 3, pp 465–475 | Cite as

Microstructural Characterization and Mechanical Property of Iridium Coating Produced by Double Glow Plasma

  • Wangping Wu
  • Xin Lin
  • Zhaofeng Chen
  • Zhou Chen
  • Xiangna Cong
  • Tengzhou Xu
  • Jinlian Qiu
Original paper

Abstract

Ir is the most interesting as an effective oxygen diffusion barrier for super high-temperature structural materials. In this study, an Ir coating, approximately 7 μm thick, was deposited onto Mo substrate by double glow plasma at substrate temperature of about 1,120 K in an argon atmosphere. The crystal orientation, morphology and mechanical property of the Ir coating were investigated by XRD, SEM, AFM, TEM, nanoindentation and scratch test. The results indicated that the (220)-oriented Ir coating was composed of the columnar grains. The surface roughness of the Ir coating was higher than that of the substrate. The hardness and the elastic modulus of the Ir coating were about 9.5 and 340 GPa, respectively. The coating had a high hardness due to the sub-micrometer size grains. The coating had good scratch resistance due to the strong adhesion of the coating to the substrate.

Keywords

Coating Morphology Hardness Plasma discharge 

Notes

Acknowledgments

This work has been supported by the National Natural Science Foundation of China (50872055/E020703) and the fund of the State Key Laboratory of Solidification Processing in NWPU (SKLSP200907). The authors gratefully acknowledge Dr. Jun Huang for help in Nanoindentation experiment and for useful discussions. The authors would also like to thank Prof. Fengming Pan and Mr. Yan Zhu at College of Science for their help in AFM characterization.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Wangping Wu
    • 1
  • Xin Lin
    • 2
  • Zhaofeng Chen
    • 1
  • Zhou Chen
    • 1
  • Xiangna Cong
    • 1
  • Tengzhou Xu
    • 1
  • Jinlian Qiu
    • 1
  1. 1.College of Material Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjingPeople’s Republic of China
  2. 2.State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’anPeople’s Republic of China

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