Abrasive resistance of HVOF thermally sprayed coatings based on alloys and cermets compared to nitrided stainless steel
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Purpose: This work is focused on the abrasion resistance comparison of alloy and cermet based coatings with nitrided stainless steel. Design/methodology/approach: The coatings deposited on the steel substrates were subjected to the abrasion test according to a modified ASTM G-65 (Rubber Wheel/Dry Sand Abrasion Test). Al2O3 abrasive sand with the granularity of 212-250 μm was used as an abrasive material. Stellite 6, NiCrBSi, Hastelloy C-276, Cr3C2-NiCr, Cr3C2-CoNiCrAlY and TiMoCN-Ni powders were used to prepare several set of samples. Findings: The obtained results show that the abrasion resistance is not directly proportional to the hardness. The difference in microstructure between cermet and alloy bases coatings in relation to their wear mechanism plays an important role. Research limitations/implications: The HVOF thermal spraying technology (High Velocity Oxygen Fuel) is commonly used as a component surface protection against abrasive wear. Alloy and cermets based coatings therefore meet the requirements for high abrasion resistance. Originality/value: The current trend in increase of operating temperature and steam parameters to improve steam turbine performance results in the operating temperatures which are close to the nitriding temperatures of steels limiting the use of this technology. For these reasons, the demand for alternative ways of functional surface protection is increasing, in particular to increase the abrasion resistance of component surfaces operating at high temperatures.
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