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Effects of powder structures and HVOF processes on erosion wear performance of WC-10Co4Cr coatings

机译：粉末结构和HVOF工艺对WC-10Co4Cr涂层冲蚀磨损性能的影响

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Conventional and multimodal WC-10Co4Cr cermet coatings were sprayed respectively by High Velocity Oxygen Gas Fuel spraying (HVOGF) and High Velocity Oxygen Liquid Fuel spraying (HVOLF), and the coating structures were analyzed by OM, SEM, XRD. Porosity, microhardness and fracture toughness of the coatings were measured. Erosion resistance of the coatings to solid sand was tested and the failure mechanisms were explored. Results showed that the mechanical properties of WC-10Co4Cr coatings deposited by HVOLF were much more superior to those deposited by HVOGF. Multimodal WC-10Co4Cr coating deposited by HVOLF had the highest microhardness and fracture toughness, the lowest porosity, the most excellent resistance of sand solid erosion wear. Its solid sand erosion resistance was enhanced above 15% and 40% respectively than conventional coatings deposited by HVOLF at 30°and 90°impact angles, and was approximately 3 times than that of multimodal coatings deposited by HVOGF at same testing conditions.
机译：分别通过高速氧气燃料喷射（HVOGF）和高速氧气液体燃料喷射（HVOLF）喷涂常规和多峰WC-10Co4Cr金属陶瓷涂层，并通过OM，SEM，XRD分析涂层结构。测量了涂层的孔隙率，显微硬度和断裂韧性。测试了涂层对固体沙的耐蚀性，并探讨了破坏机理。结果表明，HVOLF沉积的WC-10Co4Cr涂层的机械性能要比HVOGF沉积的涂层更好。 HVOLF沉积的多峰WC-10Co4Cr涂层具有最高的显微硬度和断裂韧性，最低的孔隙率，最优异的抗砂土侵蚀性能。与HVOLF在30°和90°冲击角下沉积的常规涂层相比，其抗固体沙蚀性分别提高了15％和40％以上，是在相同测试条件下由HVOGF沉积的多峰涂层的约3倍。

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