Journal
SURFACE ENGINEERING
Volume 35, Issue 1, Pages 37-45Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02670844.2018.1447782
Keywords
Fe-based amorphous coating; porosity; HVOF; computational simulation; particle size
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The relationship between the particle size and porosity of an Fe-based amorphous coating that is fabricated using a high-velocity oxygen fuel (HVOF) process was revealed by both numerical and experimental methods. A computational fluid dynamics model was implemented in order to understand the gas-flow field and the behaviour of in-flight particles with different particle sizes during the HVOF spray process. By analysing both particle velocity and temperature, the optimal particle size range (20-30 mu m) to achieve low-porosity coatings was predicted. These calculations were experimentally verified by the production of a low porosity (0.95%), Fe-based amorphous coating that was fabricated by HVOF using the predicted optimal particle size.
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