The Paton Welding Journal, 2014, №12



2014 №12 (04)

DOI of Article 10.15407/tpwj2014.12.05

2014 №12 (06)

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The Paton Welding Journal, 2014, #12, 19-24 pages  

Cermet coatings of chromium carbide-nichrome system produced by supersonic plasma gas air spraying

V.N. Korzhik, A.L. Borisova, V.V. Popov, M.V. Kolomytsev, A.A. Chajka, V.I. Tkachuk And N.V. Vigilyanskaya

E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
 
Abstract
It is a well-known fact that application of supersonic methods of thermal spray deposition results in significant increase of service properties of parts. However, up to moment no trails were made on producing of carbide or cermet coatings with the help of supersonic methods of plasma spraying. Present work is dedicated to production of cermet coatings from chromium carbide-nichrome compositions using a method of supersonic plasma gas air spraying (SPGAS). SPGAS technology has series of advantages in comparison with well-known technology of HVOF spraying. First of all, it concerns efficiency, economy and characteristics (temperature, speed) of gas jet. Structure and phase composition of produced coatings were investigated. It is shown that spraying using supersonic gas jets promotes for increase of content of Cr₇C₃ carbide and reduction of NiCr in the coatings as a result of oxidation and formation of oxides. Coating from composite powder differs by higher level of density and homogeneity, has layered fine-laminated structure with inclusions of fine carbides, contains lower amount of oxide phase, but larger quantity of chromium carbide Cr₃C₂ in comparison with coating from mechanical mixture Cr₃C₂ + NiCr. These coatings can be recommended for application as wear-resistant at increased temperatures. 6 Ref., 6 Tables, 7 Figures.
 
 
Keywords: supersonic plasma gas air spraying, cermet coatings, chromium carbide, powders, microstructure, phase composition, microhardness
 
 
Received:                17.09.14
Published:               29.12.14
 
 
References
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2. Guilemagy, M., Nutting, I., Llorca-Isern, N. (1996) Microstructural examination of HVOF chromium carbide coatings for high temperature applications. J. Thermal Spray Techn., 5(4), 483-489. https://doi.org/10.1007/BF02645280
3. Guilemagy, J.M., Espallargas, N., Suegama, P.H. et al. (2006) Comparative study of Cr₃C₂-NiCr coating. Corrosion Sci., 48, 2998-3013. https://doi.org/10.1016/j.corsci.2005.10.016
4. Kiffer, R., Benezovsky, F. (1968) Solid materials. Moscow: Metallurgiya.
5. (1986) Properties, production and application of refractory joints. Ed. by T.Ya. Kosolapova. Moscow: Metallurgiya.
6. Takenchi, J., Nakahira-Kobe, A., Takara, G. (1993) Barbezat-Wohlen Plasma-Technik. Cr₃C₂ + NiCr cermet coatings. In: Proc. of Thermal Spray Conf. (Aachen, 1993), 1-14.

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