Journal
JOURNAL OF THERMAL SPRAY TECHNOLOGY
Volume 19, Issue 1-2, Pages 368-377Publisher
SPRINGER
DOI: 10.1007/s11666-009-9433-z
Keywords
HVOF; rubber wheel abrasion test; WC-CoCr; wear mechanism
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A modified ASTM G 65 rubber wheel test was employed in wet and dry conditions using 220 nm titania particles and 368 mu m sand particles, respectively. Both tests were conducted on WC-CoCr coatings produced with two powders with different carbide grain sizes (conventional and sub-micron) to address the effect of carbide size and abrasive medium characteristics on the wear performance. The same spot before and after the wet abrasion wear testing was analyzed in detail using SEM to visualize wear mechanisms. It was shown that the wear mechanism depends on the relative size of the carbide and abrasive particles. Wear mechanisms in dry sand abrasion were studied by analyzing the single scratches formed by individual abrasive particles. Interaction of surface open porosity with moving abrasive particles causes formation of single scratches. By tailoring the carbide size, the wear performance can be improved.
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