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Coatings 2018, 8(8), 292; https://doi.org/10.3390/coatings8080292

High-Temperature Oxidation Resistance of NiAl Intermetallic Formed In Situ by Thermal Spraying

1
Department of Material Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
2
Guidao jiaotong Polytechnic Institute, Shenyang 110023, China
3
Dalian Huarui Heavy Industrial Special Spare Parts Co., Ltd., Dalian 116052, China
*
Author to whom correspondence should be addressed.
Received: 30 June 2018 / Revised: 8 August 2018 / Accepted: 12 August 2018 / Published: 19 August 2018
(This article belongs to the Special Issue From Metallic Coatings to Additive Manufacturing)
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Abstract

An Al/Ni composite coating was deposited on the surface of a pure Ti substrate by arc spray technology and plasma spray technology. In order to enable the in-situ reaction between the Al/Ni composite coating and the specimen, they were heated under different conditions. In addition, oxidation testing was conducted to test the oxidation-resistant property of the coating. The phase transition regulation of the coating after heating, the influence of heating at different temperatures and time on the reaction depth, and the correlated theory of the in-situ formation of the NiAl intermetallic compounds were studied and analyzed. The results showed that after the heat treatment, a ragged wave-like morphology was exhibited in the diffusion front of Al, and a small amount of the Ni in the diffusion region did not participate in the reaction. The growth of the NiAl intermetallic layer in the diffusion region of the Al/Ni/Ti specimen was obviously slower compared with the Al/Ni specimen. View Full-Text
Keywords: arc spray; plasma spray; in-situ reaction; NiAl intermetallic; high-temperature oxidation arc spray; plasma spray; in-situ reaction; NiAl intermetallic; high-temperature oxidation
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Jia, Q.; Li, D.; Li, S.; Zhang, Z.; Zhang, N. High-Temperature Oxidation Resistance of NiAl Intermetallic Formed In Situ by Thermal Spraying. Coatings 2018, 8, 292.

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