| METALS AND METAL MATRIX COMPOSITES |
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| Effects of Oxygen/Fuel Ratio on Properties of HVOF Fe-based Amorphous Coatings |
| YU Weiyuan*, DONG Pengfei, WU Baolei
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| State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
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Abstract Amorphous coatings have excellent physical and chemical properties and are widely used in industry. FeCrMoCBSi amorphous powder was used as spraying powder, the Fe-based amorphous coating was deposited on Q235 steel substrate by HVOF under different spraying parameters. The effect of oxygen-fuel ratio on the microstructure and wear resistance of the coatings was investigated by X-ray diffractometry (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and Vickers microhardness tester. It was found that the amorphous phase content of the coatings tended to increase as the sprayed oxygen-fuel ratio decreased. This is because the excess oxygen reduces the melting of the particles during the spraying process and oxidizes the particles. The microhardness and wear resistance of the coating increased with decreasing oxy-fuel ratios. The reason is that the particle melting degree increases, the wetting ability between the particle and the substrate increases, and the porosity decreases at a smaller oxygen-fuel ratio. All three iron-based amorphous coatings have more excellent wear resistance compared to Q235 steel substrate and are expected to be candidates for surface protection and wear resistant coatings on carbon steel.
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Published: 25 June 2024
Online: 2024-07-17
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