In the present study, Cr₃C₂-25wt%NiCr, CoCrWC (Stellite-6) and CoCrWC (FSX 414) coatings were deposited by the high-velocity oxy-fuel process on Hastelloy X substrates. The microstructure of the coatings was characterized using field emission scanning electron microscopy. X-ray diffraction was employed to identify the phase composition of the coatings. Tensile bond strength, elastic modulus and Vickers microhardness of the coatings were measured. A self-mated fretting wear test was also carried out on the coatings at room temperature and 550 °C. The results showed that some carbide dissolution occurred during the formation of Cr₃C₂-NiCr coating, although the coating displayed the highest bonding strength, Vickers microhardness and elastic modulus. The Stellite-6 coating showed a significant amount of unmelted particles and the most surface roughness. Oxide stringers were the main microstructural defect of the FSX 414 coating. The Stellite-6 and Cr₃C₂-NiCr coating had the best fretting wear resistance at the temperature of 25 and 550 °C, respectively. The wear mechanisms of the hardfacing coatings were discussed in detail.

在本研究中，Cr ₃ C ₂ -25wt%NiCr、CoCrWC (Stellite-6) 和 CoCrWC (FSX 414) 涂层通过高速氧燃料工艺沉积在 Hastelloy X 基体上。使用场发射扫描电子显微镜表征涂层的微观结构。X射线衍射用于确定涂层的相组成。测量了涂层的拉伸结合强度、弹性模量和维氏显微硬度。还在室温和 550 °C 下对涂层进行了自配合微动磨损试验。结果表明，在Cr ₃ C _{2的形成过程中发生了一定的碳化物溶解。}-NiCr涂层，虽然涂层显示出最高的结合强度、维氏显微硬度和弹性模量。Stellite-6 涂层显示出大量未熔化的颗粒和最大的表面粗糙度。氧化物纵梁是 FSX 414 涂层的主要微观结构缺陷。Stellite-6 和 Cr ₃ C ₂ -NiCr 涂层分别在 25 和 550 °C 温度下具有最佳的微动磨损性能。对表面硬化涂层的磨损机理进行了详细讨论。