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The High-Temperature Wear and Oxidation Behavior of CrC-Based HVOF Coatings

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    0508699 - ÚFP 2020 RIV US eng J - Journal Article
    Houdková, Š. - Česánek, Z. - Smazalová, E. - Lukáč, František
    The High-Temperature Wear and Oxidation Behavior of CrC-Based HVOF Coatings.
    Journal of Thermal Spray Technology. Roč. 27, č. 1-2 (2018), s. 179-195. ISSN 1059-9630. E-ISSN 1544-1016
    Institutional support: RVO:61389021
    Keywords : thermal spray coatings * hot corrosion behavior * cr3c2-nicr coatings * carbide development * hard chromium * erosion * microstructure * parameters * ceramic matrix composite * high-temperature oxidation * high-temperature wear * hp/hvof * power plant
    OECD category: Materials engineering
    Impact factor: 2.129, year: 2018
    Method of publishing: Limited access
    https://link.springer.com/article/10.1007%2Fs11666-017-0637-3

    Three commercially available chromium carbide-based powders with different kinds of matrix (Cr3C2-25%NiCr, Cr3C2-25%CoNiCrAlY and Cr3C2-50%NiCrMoNb) were deposited by an HVOF JP-5000 spraying gun, evaluated and compared. The influence of heat treatment on the microstructure and properties, as well as the oxidation resistance in a hot steam environment (p = 24 MPa, T = 609 A degrees C), was evaluated by SEM and XRD with respect to their potential application in the steam power industry. The sliding wear resistance measured at room and elevated (T = 600 A degrees C) temperatures according to ASTM G-133. For all three kinds of chromium carbide-based coatings, the precipitation of secondary carbides from the supersaturated matrix was observed during the heat treatment. For Cr3C2-25%NiCr coating annealed in hot steam environment as well as for Cr3C2-25%CoNiCrAlY coating in both environments, the inner carbide oxidation was recorded. The sliding wear resistance was found equal at room temperature, regardless of the matrix composition and content, while at elevated temperatures, the higher wear was measured, varying in dependence on the matrix composition and content. The chromium carbide-based coating with modified matrix composition Cr3C2-50%NiCrMoNb is suitable to replace the Cr3C2-25%NiCr coating in a hot steam environment to eliminate the risk of failure caused by inner carbide oxidation.
    Permanent Link: http://hdl.handle.net/11104/0299534

     
     
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