In response to the problem that the wear-resistant coating prepared by acetylene gas surfacing CoCrW on the surface of the reheated double valve stem of the nuclear power plant cannot meet the 60-year service life requirement, WILA laser cladding Ni60/graphite/MoS2 composite coating on the surface of the valve stem material (304 stainless steel) Floor.

The results show that the sample C2 cladding layer from bottom to top, the cladding layer crystals are: plane crystal, cellular crystal, cell-dendrite, columnar dendrite, equiaxed dendrite, and the average hardness is 990 HV0 3. With the increase of laser power, the fluctuation range of the hardness of various cladding layers gradually decreases, and the distribution of the hard phase becomes more and more uniform.