Experimental Study on the Properties of Laser Cladding Copper-Base Alloy on Pure Copper Contact Surface
Arc ablation is the main reason for the failure of pure copper switches.In order to improve the electric ablation resistance of pure copper contacts,Cu-W-Ni alloy cladding layers with different W contents were prepared on the surface of pure copper matrix by laser cladding technology.The microstructure,composition distribution,hardness and corrosion resistance of the cladding layer were analyzed.The results show that the cladding layer and the surface of the pure copper substrate are metallurgically bonded,without defects such as holes and cracks.On the premise of ensuring the electrical conductivity of the pure copper matrix in the core,the laser cladding layer significantly improves the surface hardness and corrosion resistance of the contacts.In addition,with the increase of W content,the hardness of the cladding layer increases continuously while the defects increase and the electrical conductivity decreases.
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