2019 №05 (02) DOI of Article
2019 №05 (04)

The Paton Welding Journal 2019 #05
TPWJ, 2019, #5, 18-27 pages
Journal                    The Paton Welding Journal
Publisher                 International Association «Welding»
ISSN                      0957-798X (print)
Issue                       #5, 2019 (May)
Pages                      18-27
Structure and phase composition of ZrB2–SiC–AlN plasma coatings on the surface of C/C–SiC composite material

Yu.S. Borisov1, A.L. Borisova1, A.P. Grishchenko1, N.V. Vigilyanskaya1, M.V. Kolomytsev1 and M.A. Vasilkovskaya2
1E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazimir Malevich Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
2I.M. Frantsevich IPM of the NAS of Ukraine 3 Krzhizhanovskii str., 03142, Kyiv, Ukraine

The process of protective plasma ZrB2–SiC–AlN coating deposition on the surface of C/C–SiC composite material was studied. Coating was sprayed using 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 was tested by a flame jet of oxygen-propane-butane torch. Coating of 400 mm thickness showed concervation of protective properties after 15 thermal cycles. Effect of thermal cyclic 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 XRD and MXRD techniques. It is found that the surface layer of the coating after thermal cyclic heating consists of Al2SiO5-based matrix with submicron ZrO2 inclusions. 25 Ref., 3 Tables, 9 Figures.
Keywords: plasma spraying, protective coating, composite material, ultra high temperature ceramics, microstructure, phase composition, interphase interaction, oxide microinclusions
Received:                13.02.19
Published:               30.05.19


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