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http://dx.doi.org/10.12656/jksht.2022.35.5.262

Effect of Gun Nozzle Movement Speed in HVOF Process on the properties of Coating Thickness and Surface  

Kim, Kibeom (Department of Marine design Convergence Engineering, Pukyong National University)
Kim, Kapbae (KETECH Co., Ltd)
Jung, Jongmin (Department of Industrial Facility Automation, Ulsan Campus of Korea Polytechnic)
Kim, Kwonhoo (Department of Metallurgical Engineering, Pukyong National University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.35, no.5, 2022 , pp. 262-269 More about this Journal
Abstract
In order to process materials such as engineering plastics, which are difficult to mold due to their high strength compared to conventional polymer materials, it is necessary to improve the hardness and strength of parts such as screws and barrels of injection equipment in extrusion system. High-velocity oxygen fuel (HVOF) process is well known for its contribution on enhancement of surface properties. Thus in this study, using the HVOF process, WC coating layers of different thicknesses were bonded to the surface of S30C substrate by controlling the movement speed of the spray nozzle and each property was evaluated to decide the optimization condition. Through the results, the thickness of WC coating layer increased from 0 to 200 ㎛ maximum, along with the decrement of nozzle movement speed and the surface hardness get increased. Especially, the coated layer with the thickness over 180 ㎛ under the nozzle speed 500 mm/s had high hardness than thinner layer. In addition, the amount of wear consumed per unit time was also significantly reduced due to the formation of the coating layer.
Keywords
HVOF process; Carbon steel; Hardness improvement; WC coating; Nozzle speed;
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