Journal of Thermal Spray Technology

, Volume 24, Issue 3, pp 348–356 | Cite as

Microstructural Characterization and Tribological Behavior of HVOF Sprayed NiMoAl Coating from 20 to 800 °C

  • Jie Chen
  • Huidi Zhou
  • Xiaoqin Zhao
  • Jianmin Chen
  • Yulong An
  • Fengyuan Yan
Peer Reviewed
First Online:
Received:
Revised:

Abstract

NiMoAl coating was deposited by high velocity oxy-fuel spraying from gas-atomized powders and its tribological properties from 20 to 800 °C under unlubricated conditions were evaluated. Scanning electron microscopy, x-ray diffraction, and Raman spectroscopy were used to characterize the coating and corresponding wear tracks to determine the lubrication mechanisms. The friction coefficient of NiMoAl coating that decreased gradually with the increase of temperature exhibited the highest value of 0.8 at 20 °C and the lowest value of 0.29 at 800 °C. Meanwhile, NiMoAl coating also possessed an excellent anti-wear property and the wear rate of the coating maintained at a relatively low value at all test temperatures. Characterizations of worn surfaces revealed that the coating suffered abrasive wear at the low temperature. When the temperature elevated to 600 and 800 °C, molybdenum oxide and nickel molybdate that were formed through tribo-chemistry reactions acted as lubricants at the high temperature. In addition, NiMoAl coating experienced no obvious oxidation or phase transition on the unrubbed surface during the friction test at 800 °C, indicating that the coating performed both thermal stability and lubrication function at the high temperature.

Keywords

abrasion testing coefficient of friction friction high-temperature wear HVOF nickel alloys tribology 
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Notes

Acknowledgments

The authors are grateful to the National Natural Science Foundation of China (Grant Nos. 51302272, 51275509 and 51175491), the 973 Project of China (No. 2013CB632300), and the Chinese Academy of Sciences for financial support.

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Copyright information

© ASM International 2014

Authors and Affiliations

  • Jie Chen
    • 1
    • 2
  • Huidi Zhou
    • 1
  • Xiaoqin Zhao
    • 1
  • Jianmin Chen
    • 1
  • Yulong An
    • 1
  • Fengyuan Yan
    • 1
  1. 1.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhouPeople’s Republic of China
  2. 2.University of Chinese Academy of SciencesBeijingPeople’s Republic of China

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