Influence of Rare Earth on the High-Temperature Sliding Wear Behavior of WC-12Co Coating Prepared by HVOF Spraying
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In this work, WC-12Co coatings were prepared by high-velocity oxygen fuel spraying (HVOF) technology. The high-temperature sliding wear tests at 450, 550 and 650 °C were conducted on a pin-on-disk tribometer, and effects of CeO2 on the high-temperature wear behavior were investigated. The results showed that CeO2-modified WC-12Co coating possessed better sliding wear resistance than that of conventional WC-12Co coating at the tested temperatures. The maximum microhardness value of 1333 ± 25HV0.5 was available at the temperature of 550 °C for CeO2-modified WC-12Co coating worn track. The oxides formed on the worn surface played a significant role on the wear behavior. W2C, Co3O4 and ratio of CoWO4/WO3 dominated the wear behavior of the coating at 450, 550 and 650 °C, respectively.
KeywordsHVOF rare-earth, high-temperature wear properties WC-12Co coating
This project is supported by National Natural Science Foundation of China (Grant No. 51505393).
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