期刊
JOURNAL OF THERMAL SPRAY TECHNOLOGY
卷 20, 期 3, 页码 549-559出版社
SPRINGER
DOI: 10.1007/s11666-010-9572-2
关键词
cermets; erosion testing; nanostructure; plasma spray coatings; wear testing
资金
- Spanish Ministry of Education and Science [MAT 2006-12945, MAT 2009-14144]
The effects of plasma intensity and powder particle size on wear and erosion resistance have been evaluated for WC-12 wt.% Co coatings deposited by Air Plasma Spraying. Coatings were deposited from micrometric and nanostructured powders. SEM and XRD characterization showed the presence of WC, W(2)C, W, and an amorphous Co-rich matrix. The performance of the different coatings was compared in sliding wear tests (ball-on-disk), under dry friction conditions. Wear debris and tracks were analyzed by SEM. The debris generated during the test was found to have a great influence on the sliding properties. Wear follows a three-body abrasive mechanism and is dominated by coating spallation because of subsurface cracking. In order to evaluate erosion behavior, solid particle erosion tests were conducted. Eroded coatings were analyzed by SEM, and erosion mainly occurs by a cracking and chipping mechanism. The study shows that wear and erosion behavior is strongly affected by plasma arc intensity.
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