Science in China Series E: Technological Science

, Volume 45, Issue 5, pp 477–484 | Cite as

Microcrystalline coatings deposited by series double-pole electro-pulse discharge and its high-temperature oxidation behavior

  • Xu Qiang 
  • He Yedong 
  • Wang Deren 
  • Qi Huibin 
  • Li Zhengwei 
  • Gao Wei 
Article
  • 53 Downloads

Abstract

A new technique—series electro-pulse discharge (SEPD)—was developed as a surface coating process. In this process, both positive and negative poles of a pulse power were used as the depositing electrodes and the substrate alloy was used as an induction electrode. The physical process for such SEPD was tested by measuring the relationship between the discharge voltages and gaps in a pin-plate-pin system. Microcrystalline Ni20Cr alloy coatings and oxidedispersed Ni20Cr alloy coatings were prepared on Ni20Cr alloy surface by using a vibrating SEPD device. Oxidation at 950°C in ambient air showed that the microcrystalline Ni20Cr alloy coatings greatly improved the oxidation resistance of the substrate alloy. The addition of dispersed Y2O3 nano-particles into the microcrystalline coatings was found to further reduce the oxidation rate and enhance the oxide spallation resistance.

Keywords

series electro-pulse discharge deposition dispersed Y2O3 microcrystalline coatings high-temperature oxidation 

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Copyright information

© Science in China Press 2002

Authors and Affiliations

  • Xu Qiang 
    • 1
  • He Yedong 
    • 1
  • Wang Deren 
    • 1
  • Qi Huibin 
    • 1
  • Li Zhengwei 
    • 2
  • Gao Wei 
    • 2
  1. 1.Beijing Key Laboratory of Corrosion. Erosion and Surface TechnologyUniversity of Science and TechnologyBeijingChina
  2. 2.Department of Chemical and Material EngineeringUniversity of AucklandNew Zealand

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