Study On Erosion Wear Behavior Of Solid Particle For Cermet Coating

Solid particle erosion is one of the main reasons that caused the failure of protective coating. At present, the wear mechanism and failure behavior is still lack of systematical research. Solid particle erosion wear behavior of the Cr3C2-NiCr cermet coating was studied using the method of numerical simulation, experimental and theoretical analysis. Its main ideas are as follows:(1) The erosion wear mechanism and the main influence factors were analyzed. According to the lack of the existing literature on numerical simulation method of the erosion process, the numerical modeling method of erosion wear process was put forward based on the theory of explicit dynamics. And the key technologies of simulation were studied in depth.Furthermore, the mechanical model of single particle erosion was established using the ANSYS/LS-DYNA software. Then, the variation of the particle motion and energy during the erosion process were analyzed. The validity of the modeling method was verified through the analysis of simulation under single particle erosion conditions and the comparison with the existing experimental data.(2) The bias modeling method was put forward. And the simulation model of multiple solid particle erosion wear further established. Then the effects of erosion factors such as coating thickness, erosion particle velocity and particle size on the cermet coating materials have been respectively simulated. Results show that the coating thickness is the key factors affecting erosion wear. And reasonable coating thickness(over 100μm) should be prepared to effectively protect the substrate material; Solid particle erosion mechanism is mainly determined by the kinetic energy of the particle erosion.Moreover, erosion wear rate becomes higher with the increase of impact velocity; The wear rate and equivalent stress were the biggest of all in the diameter range of 40 ~ 60μm. Furthermore, the values were almost the same more than 60μm.(3) Cr3C2-NiCr cermet coating was prepared. Then, the coating surface and cross section micro area of the organization were observed, and the coating properties were analyzed. Experimental studies were carried out under the different erosion conditions( pressure, impact angle, particles size and erosion temperature). It was found that erosion wear rate of coating material was the largest in 60° impact angle. And the coating material exhibited the brittle ductile erosion failure mechanism at the same time. On the other hand,the test results were compared with those of the simulation data.(4) In view of the related defects of the existing high temperature erosion test apparatus, a testing device with an adjustable angle of high temperature solid particle erosion wear was designed and some main components were projected. Then, it offers a more efficient test method for the subsequent study for high temperature erosion wear.