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In this paper, the existence of the current method used in the manufacture of diamond wear layer combined with low intensity burning diamond and other issues to preset the Ni-base since the soluble alloy Q235 steel as the test timber, the choice of 35 to 40 mesh (420 ~~ 500μm) plated nickel diamond particles as an injection material, the use of argon arc cladding - injection technology preparation of a wear-resistant coating of low-cost, diamond wear layer preparation explore a new way. Operating current, powder feed rate, scanning speed as adjustable parameters for process test to determine the parameters of the optimization process of preparation of composite coating and composite coating tissue and diamond and matrix alloy by SEM, XRD and EDS combine analysis; microhardness microhardness measurements, friction and wear testing machine wear performance testing. The experimental results show that, after nickel plating of the diamond can be smoothly into the molten bath and uniformly distributed in a certain depth, organization dense coating, diamond particles is complete, the edge angular. Coating phase mainly composed of a solid solution (Fe, Ni), Fe23B6, Ni, and C (diamond). Single coat diamond surrounded by a significant unmelted Ni layer, the diamond without burning phenomenon, the Ni layer and the carcass alloy are metallurgically bonded. Molten pool around the diamond particles, the amount of dissolution of the nickel layer of the different depth point is different, the upper portion of the particles below the central particles. Lap coating multi-channel non-overlapping area with a single coat of the same plated Ni layer well-preserved, the diamond without burning. Overlapping region, the first injection of the diamond in the secondary heating effect, the Ni-plated layer is completely dissolved in the carcass metal diamond angular disappeared, to start burning. Argon Arc Cladding - injection diamond composite coating microhardness about HV0.2360 about higher than argon clad Ni-base alloy hardness value. The overlapping multi-channel overlapping area hardness uniform distribution fluctuations, exhibiting no significant change from top to bottom. By friction and wear experiments, argon arc cladding - injection greatly improve the wear resistance of diamond composite coatings, the wear resistance of the single-channel composite coating 56 Q235 steel, the wear resistance of composite coating of multi-channel Q235 steel 46 times. Wear in the form of diamond composite coating is mainly abrasive wear, adhesive wear. The wear of the diamond particles is mainly complete, wear, crushing three forms, and its edges remain a good combination of alloy with the carcass, no cracks, particle shedding.
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