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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2012

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Microstructure characterization of chromium carbides coatings deposited by thermal spraying processes

Richert M. W., Książek M., Pałka P., Wawrzyniak S., Grzelka R., Płońska-Niżnik K.

Journal of Achievements in Materials and Manufacturing Engineering

2012

Vol. 55, nr 1

108--112

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.