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Journal of Materials Science

, Volume 44, Issue 12, pp 3265–3272 | Cite as

Comparison of the coatings deposited using Ti and B4C powder by reactive plasma spraying in air and low pressure

  • Zhengping Mao
  • Jing Ma
  • Jun Wang
  • Baode SunEmail author
Article

Abstract

The coatings were deposited by reactive plasma spraying (RPS) in air and low-pressure plasma spraying (LPPS) based on the reaction between Ti and B4C powder, respectively. The thermal spray powder of Ti and B4C added with powder Cr (metallic binder) in air is compared with that without powder Cr addition in the low pressure. (Prior to deposition, the powder was screened and separated for RPS whereas spray drying, sintering and sieving were done for LPPS.) The phase composition and the microstructure of coatings were studied by X-ray diffractometer (XRD) and scanning electron microscopy (SEM). The anti-corrosion property of coatings was also investigated. It is found that the coating prepared by RPS, which is more densification, is composed of TiN, TiB2, and a small phase fraction of titanium oxides. The composition of the coating deposited by reactive LPPS is TiB2, Ti(C, N), Ti4N3−x and impurity phase of Ti5Si3. There is no appearance of titanium oxides in low pressure. The coatings have the typical lamellar structure and adhere to the bond coating well. The mean Vickers microhardness value of the coating deposited by RPS is higher than that of the coating deposited by LPPS. Furthermore, the corrosion resistance of the coating deposited by RPS is superior to that of the coating prepared by LPPS in near neutral 3.5 wt% NaCl electrolyte.

Keywords

Vickers Microhardness Weibull Modulus Blended Powder Plasma Flame Scanning Electron Microscopy Morphology 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

This study was financially supported by the Opening fund Program of China (No. KFJJ07-2). The authors are grateful to Mr. H. Ji and Mr. X. M Zhu for depositing of coatings, and the XRD analysis by Mr. H. B. Han for in the instrumental analysis centre of Shanghai Jiaotong University. The authors are also thankful for the hard work of editors and reviewers on this article.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.State Key Laboratory of Metal Matrix CompositesShanghai Jiaotong UniversityShanghaiPeople’s Republic of China
  2. 2.State Key Laboratory of Explosion Science and TechnologyBeijing Institute of TechnologyBeijingPeople’s Republic of China
  3. 3.Material InstituteHebei University of Science and TechnologyShijiazhuangPeople’s Republic of China

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