Structure and oxidation resistance of plasma sprayed Ni-Si coatings on carbon steel

Wu, Yingna N.; Kawahara, Yuzo; Kurokawa, Kazuya

Vacuum, 2006, 80(11-12), 1256-1260

Permalink : https://hdl.handle.net/2115/14805

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アクセス権
open access
URI
https://hdl.handle.net/2115/14805
タイトル
Structure and oxidation resistance of plasma sprayed Ni-Si coatings on carbon steel
著者
Wu, Yingna N. ; Kawahara, Yuzo ; Kurokawa, Kazuya
著者名
Wu, Yingna N.
著者名
Kawahara, Yuzo
e-Rad_Researcher
00161779
著者名
Kurokawa, Kazuya
言語
英語
キーワード
Plasma sprayed Ni-Si coatings
Structure of coating layer
High-temperature oxidation
Interfacial reaction
発行日
2006
出版者
Elsevier Ltd
収録物名
Vacuum
巻(号)
80(11-12)
ページ
1256-1260
抄録
Ni-Si coatings consisting of mainly NiSi2 and NiSi were deposited on a carbon steel by air plasma spraying. Isothermal oxidation tests of the carbon steel substrates with the Ni-Si coatings at 500-800 ℃ have been carried out. The result indicated that a protective SiO2-based oxide scale was formed on the surface of the coatings after oxidation. On the other hand, during oxidation, phase transformation occurred among the NiSi2, NiSi and Ni2Si phases constructing the Ni-Si coatings. This was caused by the extraction of silicon from the silicides and the reformation of silicides at the silcide/Si-blocks interface. Above 700 ℃, the outward diffusion of iron and carbon became very fast and consequently decarburization happened at the coating/substrates interface, which induced the formation of pores in the substrates near the interface. In addition, grain boundary oxidation of Cr in the steel substrate was observed above 700 ℃.
資源タイプ
学術雑誌論文
出版タイプ
Accepted Manuscript
PISSN
0042-207X
関連情報
URI
http://www.sciencedirect.com/science/journal/0042207X
関連情報 (isVersionOf)
出版社版DOI
https://doi.org/10.1016/j.vacuum.2006.01.031