Automatic Welding, 2019, №05



2019 №05 (02)

DOI of Article 10.15407/as2019.05.03

2019 №05 (04)

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Avtomaticheskaya Svarka (Automatic Welding), # 5, 2019, pp.25-35

Structure and phase composition of ZrB₂-SiC-AlN plasma coatings on the surfae of C/C-SiC composite materials

Yu.S. Borisov¹, A.L. Borisova¹, A.P. Grishchenko¹, N.V. Vigilanskaya¹, M.V. Kolomiitsev¹, M.A. Vasilkovskaya²

¹E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
²I.N. Frantsevich IPM of the NAS of Ukraine. 3 Krzhizhanovskii Str., 03142, Kyiv, Ukraine

The process of formation of protective plasma ZrB₂-SiC-ALN coating on the surface of C/C-SiC composite material was studied. Coating was applied by subsonic Ar/N₂-plasma jet and supersonic jet of air-gas plasmatron. The role of interphase phenomena occurring during plasma spraying in the volume of particles of ZrB₂-SiC-AlN composite powder in formation of the coating layer was established. It is shown that the composition and velocity of the plasma spray jet affects the structure and phase composition of the forming ZrB₂-SiC-AlN coating. Resistance of the produced coatings to thermal cyclic heating by a flame jet of oxygen-propane-butane torch was tested. Coating of 400 μm thickness showed preservation of protective properties after 15 thermal cycles. Effect of thermocyclic heating on formation of a three-zone structure in the protective coating, as a result of oxidation process was studied. Its texture and phase composition was examined by XSPA and RSMA techniques. It is found that the surface layer of the coat ing after thermocyclic heating consists of Al₂SiO₂-based matrix with submicron ZrO₂ inclusions. 25 Ref., 3 Tabl., 9 Fig.
Keywords: plasma spraying, protective coating, composite material, ultra high temperature ceramics, microstructure, phase composition, interphase interaction, oxide microinclusions

Received: 13.02.2019
Published: 04.04.2019

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