Effects of addition of rare earth on properties and structures of Ni-W-B-SiC composite coatings

摘要

The effects of rare earth (RE) on the composition, phase structures, surface morphologies and hardness of electrodeposited RE-Ni-W-B-SiC composite coatings were discussed. The results show that W and SiC contents in the coatings increase with the increase of RE in the bath. When RE is added in the coatings. the grains are refined and the trend of formation of formation of amorphous coatings is increased. Moreover, the thermal stability of the RE-Ni-W-B-SiC composite coatings is enhanced. The hardness of the coatings is increased with the increase of heat treatment temperature, and it reaches the peak value when heated at 400deg.C. Besides, the hardness of the RE-Ni-W-B-SiC coatings is higher than that of the Ni-W-B-SiC coatings.