Abstract
The present work investigates comprehensively the tribological behaviour of WC-Cr3C2-Ni coatings prepared by atmospheric plasma spray (APS) and high-velocity oxy-fuel (HVOF) spray methods. The dry sliding wear at room and elevated temperature (up to 800 °C), wet (oil-based fracturing fluid) sliding wear at room temperature were studied against an alumina ball using the ball-on-disc tribometer according to the ASTM G99 standard. The erosion wear was studied using air-jet erosion tester (ASTM G76) at the impact angles 30° and 90° and temperatures 500 °C and 650 °C. The HVOF coating showed higher hardness, dense morphological structure and a lower degree of decarburisation as compared to APS coating. The HVOF coating offers better wear resistance over the APS coating under both dry and wet sliding conditions. Significant improvement in the wear resistance, especially above 500 °C is attributed to the uniform formation of lubricious WO3. The solid particle erosion resistance of both coatings is observed to be the same up to 650 °C under 30° and 90° impact angles.
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