The invention relates to a laser cladding method for preparing a nickel-based heat resistant and wear-resistant coating on a zirconium alloy surface, which includes a step of grinding and cleaning the zirconium alloy substrate surface to be coated by laser; The steps of fully mixing nickel base alloy powder and organic binder, and blending into a uniform paste, evenly coated in advance on the surface of the zirconium alloy substrate to be fused; Before laser cladding, argon gas is pre-passed. Using laser beam on zirconium alloy substrate surface preset powder area for single radiation scanning cladding steps, process parameters: laser power is 2.0KW ~ 3.8kW, beam spot diameter is 5mm, scanning speed is 3mm/s ~ 5mm/s, protection gas flow is 8L/min ~ 15L/min; The laser cladding process is carried out continuously and the dilution rate is not more than 10%. The invention adopts laser in situ cladding process to prepare nickel base heat resistant and wear-resistant coating on the surface of zirconium alloy. The operation process is simple and easy, no noise, environmental protection and pollution-free, and can reduce energy consumption and production cost. The wear-resistant coating has excellent performance and can meet the requirements of use.
In recent years, with the development of laser technology, the laser cladding method for material surface modification has been paid more and more attention, especially for the more expensive zirconium alloy laser cladding surface modification, which can meet the economic requirements of people. Laser cladding technology is fast in heating and cooling, the workpiece deformation caused by thermal cycling is small, and the coating prepared has metallurgical bonding characteristics with the matrix, and the crystalline structure of the cladding layer is fine. Laser cladding on zirconium alloy surface can not only improve the heat resistance and wear resistance of zirconium alloy substrate, but also reduce the manufacturing cost, which has a good application prospect in chemical industry, petrochemical industry, atomic energy industry and other fields.
Zirconium alloy has become an important structural material in nuclear industry and chemical industry because of its low thermal neutron absorption cross section and good corrosion resistance. However, its poor surface heat resistance and wear resistance and high price limit its full play of potential. For zirconium alloy surface modification, the domestic and foreign scholars on the surface of the coating and ion implantation method has research, these methods can improve the corrosion resistance of the zirconium alloy surface, but in the actual operation process trival, especially because of ion implanted film coating and thinner, to improve the effect of zirconium alloy surface heat resistance and abrasion resistance is not obvious.
