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

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Coatings

MDPI AG

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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.

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      Most cited references 28

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      High-temperature oxidation of titanium

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        Mechanisms of formation of diffusion aluminide coatings on nickel-base superalloys

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          Oxidation behavior of a high Si content Al–Si composite coating fabricated on Ti–6Al–4V substrate by mechanical alloying method

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            Author and article information

            Journal
            COATED
            Coatings
            Coatings
            MDPI AG
            2079-6412
            August 2018
            August 19 2018
            : 8
            : 8
            : 292
            10.3390/coatings8080292
            © 2018

            https://creativecommons.org/licenses/by/4.0/

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            Self URI (article page): http://www.mdpi.com/2079-6412/8/8/292

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