Study On High Temperature Abrasive Wear Resistant Properties Of The Arc Sprayed Metal-Based Ceramic Composite Coating

In practice, wearing made a large amount of lost in industry production as one of the main form of expiration. Therefore,how to improve the wear-resistance and increase the service life of the components was very meaningful,and it also decreaseed the cost and improved the production efficiency. It became a keystone to fabricate the anti-wear coatings on the surface of the work pieces. Ceramic composite coatings had high hardness, wear resistance, high temperature oxidation, corrosion resistance and high chemical stability. They also had high toughness and plasticity. Therefore, it was a perfect coating material. It has been commonly used that many thermal spraying methods for ceramic composite coating, such as powder flame spraying, plasma spraying, HVOF spraying and arc spraying. Comparing with several spraying methods, arc spraying had the advantages of easy-adjusting chemical compositions, low cost and operating on site applicable.In this study, iron-based composite coatings were deposited on mild steel substrate by arc spraying cored wire with Cr3C2 ceramic powders. The microstructure, phase compositions and worn surface morphologies of the coatings were examined by means of optical, scanning electron microscopy and X-ray diffraction. The abrasion wear resistance properties were evaluated by HAWM-1 high temperature abrasive wear machine developed by self. It was studied that the effect of carbide ceramic content in cored wire and post heat-treatments on the properties of the coatings. Research results were as follows:The SEM and XRD methods were used to analyze the microstructure of the composite coating produced by arc spraying 304 cored wire and 430 cored wire. The microscopic structure of coatings appeared typical layered structure characteristics. The coatings had high density, had not coarse pore, and had very thin oxide films and a small quantity of gas porosity.It was feasible that metal-based composite coatings were deposited on mild steel substrate by arc spraying cored wire with Cr3C2 ceramic powders. The results showed that all coatings exhibited better abrasive wear resistance at 650℃. Metal-based ceramic composite coatings by arc spraying with different cored wire high temperature abrasive wear properties were studied. The results showed that abrasive wear resistance of the metal-based ceramic composite coating by arc spaying with carbon steel wire material in the Cr3C2 content of 9~12% was best at 650℃. The abrasive wear resistance of the metal-based ceramic composite coating by arc spaying with 304 stainless steel wire material in the Cr3C2 content of 15~18% was best at 650℃. C4 cored wire, which was made of 430 stainless steel wire with Cr content of 22~26%, producing a metal-based ceramic composite coating resistant to abrasive wear was best at 650℃.