The Cr3C2-25NiCr coatings were prepared by detonation gun spraying technology.The effects of spraying distance and oxygen/fuel in-gun ratio on the properties of Cr3C2-25NiCr coatings were studied by SEM test,micro-hardness test,deposition efficiency test and bending property characterization.The results show that when the spraying distance is 250 mm and the oxygen/fuel in-gun ratio is 45％,the melting of Cr3C2 phase is sufficient,and the prepared coating has the best performance,The porosity of the coating is only 0.52％,and the micro-hardness is 878.6 HV0.3.The deposition efficiency of the coating drops with the increase of spraying distance,and rises with the increase of the oxygen/fuel in-gun ratio.The spraying distance and the oxygen/fuel in-gun ratio have no significant effect on the bending properties of the coatings.
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