Study on Microstructure and Properties of Cr3C2/Fe Coating Prepared by Arc Spraying on Copper Surface

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In this paper the new process of arc spraying was researched on CuCo2Be alloy surface,the high strength and high wear resistance Cr3C2/Fe coating were prepared on CuCo2Be alloy surface by adopting a series of different arc spraying process parameters. Based on the test the arc spraying process parameters was optimized, the optimized result was: spraying voltage was 38V, the current is 180A, spraying distance was 150mm, spraying air pressure was 0.7MPa, the bonding strength of the coating and the substrate was 30.5MPa; and the thermal shock resistance of coating Cr3C2/Fe was studied in detail by different spraying process parameters, it was showed: thermal shock resistance of the coating was best by spray low voltage and low current process. By using microhardness tester, super depth of field microscope, SEM, EDS and XRD, mechanical properties, microstructure, phase composition and its content distribution of Cr3C2 / Fe coating were studied, the study results were showed: the micro-hardness of coating was 992.75HV, coating was a typical lamellar structure, and a small amount of pore and oxides in the coating; the mainly phase of coating included: Fe, Fe-Cr, C0.14 Fe1.86 and Fe7C3.

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33-36

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December 2014

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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