Microstructure characterization of chromium carbides coatings deposited by thermal spraying processes

• Autorzy: Richert M. W. , Książek M. , Pałka P. , Wawrzyniak S. , Grzelka R. , Płońska-Niżnik K.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The Cr₃C₂-NiCr coatings were deposited by plasma spraying (PS) and high velocity oxy-fuel (HVOF) processes. The objective of the work concerns characterization of microstructure of sprayed coatings. In the investigated samples, apart from Cr₃C₂ carbide particles, the carbides Cr₇C₃ were also present according to the reported through X-ray diffraction analyses. It is likely that Cr₇C₃ carbides were formed thorough decarburization of Cr₃C₂. The microstructure of the thermal sprayed Cr₃C₂-NiCr coatings was characterized by optical (MO), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The fine-grained and nano-crystalline microstructure was found in the investigated coatings. The microhardness of coatings was measured. It was found that the coatings deposited in HVOF process have higher microhardnes than the plasma spraying one. The formation of chromium carbide phases in the coatings was discussed based on the microstructure observation results. Design/methodology/approach: The investigations of coating microstructure by optical microscopy (MO) Olympus GX51, scanning electron microscopy STEREOSCAN 420 and transmission electron microscopy JEM2010 ARP (TEM) were performed. The examination of phase consistence was determined by Brucker D8 Discover - Advance diffractometer with copper tubing. The microhardness of coatings was measured by Vickers method. Findings: The microstructures of Cr₃C₂-NiCr coatings were observed and analyzed. On the base of the microstructure investigations and contend of the chromium carbides the mechanism of thermal sprayed coating formation was discussed. Practical implications: The performed investigations contribute to the improvement of microstructure and properties of thermal spraying coatings used in the industrial applications. Originality/value: It was assumed that thermal spraying processes are able to form nano-crystalline microstructure of the chromium carbide coatings.

Słowa kluczowe

EN

plasma sprayed and high velocity oxy-fuel processes; microstructure; Cr3C2 carbides

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2012
• Tom: Vol. 55, nr 1
• Strony: 108--112
• Opis fizyczny: Bibliogr. 16 poz., rys., tab.

Twórcy

autor

Richert M. W.

• Faculty of Non-Ferrous Metals, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Książek M.

• Foundry Research Institute, ul. Zakopiańska 73, 30-418 Kraków, Poland

autor

Pałka P.

• Faculty of Non-Ferrous Metals, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Wawrzyniak S.

• Plasma SYSTEM S.A., ul. Towarowa 14, 41-103 Siemianowice Śląskie, Poland

autor

Grzelka R.

• Plasma SYSTEM S.A., ul. Towarowa 14, 41-103 Siemianowice Śląskie, Poland

autor

Płońska-Niżnik K.

• Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science & Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland

Bibliografia

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