Fabrication of conventional and nanostructured NiCrC coatings via HVAF technique

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The conventional and nanostructured NiCrC (with chemical composition of 80%NiCr-20%CrC) coatings with high quality were fabricated via high velocity air-fuel(HVAF) spraying technique. The microstructures of these coatings were characterized by means of metallographic microscopy, scanning electron microscopy, transmission electron microscopy and X-ray diffractometry. A Vickers microhardness tester was used to determine the mechanical properties of the as-sprayed coatings. The single-line approximation(SLA) method was employed to calculate the grain size and microstrain of as-sprayed nanostructured coating based on the XRD data. The results show that nanostructured NiCrC coating possesses a more uniform and denser microstructure, much higher microhardness and better fracture toughness than its conventional counterpart. Both TEM observation and calculation results based on XRD profile show that as-sprayed nanostructured NiCrC coating has a homogeneous nanocrystalline microstructure with an average grain size of 40 nm. © 2008 The Nonferrous Metals Society of China.




TAO, K., ZHANG, J., CUI, H., ZHOU, X. lin, & ZHANG, J. shan. (2008). Fabrication of conventional and nanostructured NiCrC coatings via HVAF technique. Transactions of Nonferrous Metals Society of China (English Edition), 18(2), 262–269. https://doi.org/10.1016/S1003-6326(08)60046-1

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