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Title: High Velocity Oxygen Liquid-Fuel (HVOLF) Spraying of WC-Based Coatings for Transport Industrial Applications
Authors: Brezinová, Janette
Guzanová, Anna
Tkáčová, Jana
Brezina, Jakub
Ľachová, Kristína
Draganovská, Dagmar
Pastorek, Filip
Maruschak, Pavlo
Prentkovskis, Olegas
Keywords: High Velocity Oxy-Fuel (HVOF) thermal spraying
wear resistance
indentation fracture toughness
Issue Date: 2020
Publisher: MDPI
Citation: Brezinová, J.; Guzanová, A.; Tkáčová, J.; Brezina, J.; Ľachová, K.; Draganovská, D.; Pastorek, F.; Maruschak, P.; Prentkovskis, O. High Velocity Oxygen Liquid-Fuel (HVOLF) Spraying of WC-Based Coatings for Transport Industrial Applications. Metals 2020, 10, 1675.
Series/Report no.: 10;12
Abstract: In this article, we analyse five types of coatings, in terms of their microstructure, hardness, porosity, and wear resistance, in the as-sprayed state. The coatings are WC-based (WC-FeCrAl, WC-WB-Co, and WC-NiMoCrFeCo), alloy-based (Co-MoCrSi), or nanoWC coating-based (nanoWC-CoCr). Two tests were applied to assess the wear resistance of the coatings: a dry-pot wear test with two impact angles and an abrasive test using an abrasive cloth with two grit sizes. Porosity was determined by image analysis. Vickers impression was performed on cross-sections of the coatings, in order to determine their indentation fracture toughness. The highest hardness of the tested coatings was recorded for the nanoWC coating, followed by the rest of the WC-based coatings; meanwhile, the lowest hardness was recorded for the alloy coating. Minimal porosity was achieved by the alloy coating, due to its different nature and the absence of hard particles with a higher melting point. The NanoWC coating and other WC-based coatings had a higher porosity; however, porosity did not exceed 1% for each coating. The best wear resistance was achieved by the nanoWC coating, followed by the other WC-based coatings, with the lowest obtained by the alloy coating. The same tendency was recorded when determining the indentation fracture toughness. From a microscopic point of view, the structure of the evaluated coatings is not compact; nevertheless, their properties are excellent, and they act as compact coatings under load.
Description: This article belongs to the Special Issue Application of Alloys in Transport
ISSN: 2075-4701
Appears in Collections:Moksliniai straipsniai / Research articles

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