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采用3种高速火焰热喷涂设备将6种商业粉末喷涂在0Cr13Ni5Mo不锈钢基材上,制成结构不同的WC-Co-Cr涂层.用自行研制的料浆罐冲蚀试验机对9种涂层和基材的冲蚀行为进行研究,重点分析气孔率和层状结构对涂层耐冲蚀性能的影响.结果表明:气孔率和层状结构均降低了涂层的耐冲蚀性能,低速低料浆浓度时,气孔率对涂层耐冲蚀能力的影响较层状结构严重,气孔率高的涂层耐冲蚀性能甚至不如基材;高速和高料浆浓度时,层状结构明显的涂层耐冲蚀性能更差.本文探讨了利用单摆冲击划痕法测定涂层比能耗来定量表征层状结构的有效性,讨论了利用涂层气孔率和比能耗的测量结果推测其耐冲蚀性能的可能性.
Six kinds of commercial powders were sprayed on 0Cr13Ni5Mo stainless steel substrate by using three kinds of high-speed flame thermal spraying equipment to make WC-Co-Cr coatings with different structures. Nine kinds of coatings were tested on a self-developed slurry tank erosion tester And the erosion behavior of the substrate were investigated, and the influence of porosity and layer structure on the erosion resistance of the coating was analyzed.The results showed that both the porosity and the layered structure reduced the erosion resistance of the coating, Slurry concentration, the porosity of the coating erosion-resistant ability of the more serious than the layered structure, high porosity of the coating erosion resistance even less than the substrate; high-speed and high slurry concentration, the layered structure is obvious The corrosion resistance of the coating is even worse.This paper discusses the validity of the quantitative characterization of the layered structure by measuring the specific energy consumption of the coating by the pendulum impact scratch method and discusses the measurement results of the coating porosity and the specific energy consumption Its erosion resistance possibilities.