| As the key part in continuous casting production, copper crystallizer beared high-temperature oxidation, chemical corrosion, surface wear and thermal fatigue in the action of high-temperature molten steel and low-temperature cooling water, which contribute to the failure of the mold. Therefore, it was necessary to research the wear-resistant surface coating on copper to prolong the crystallizer working life and improve quality of slab and efficiency of continuous casting producion.In this paper, laser cladding technology as a strengthen method was prepared to obtain strengthen coatings on the invalid Ni-Co coating mold. Nickel-based alloy cladding and cobalt-based alloy cladding were analyzed. In this paper nickel based alloy cladding was the main research object considering the mold working conditions and economic efficiency.Nickel-based alloy coating was successfully obtained on copper directly. Microstructure, phase composition and hardness were analyzed. Besides, bonding strength of coating and basement, oxidation resistance and thermal shock resistance of the coating at high temperature were also tested and the results showed that, the coaing with good performaces in oxidation and thermal shock.Friction stir welding was prepared to obtain transition layer of stainless steel on copper considering its characteristics. Nickel-based alloy cladding layer with WC which improved the coating hardness and wear resistance was obtained on transition layer. Microstructure, phase composition, hardness and thermal shock resistance of the coating prepared by the combination of friction stir welding and laser cladding technology were analyzed. The results showed that this method had good feasibility. |
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