Laser surface clad coating modified by rare earth

摘要

This work deals with the effect of rare earth elements (RE) on the laser surface clad coatings. The friction and wear properties of these laser clad coatings were investigated. Laser cladding nickel-based alloy coatings containing various content of rare earth elements were prepared. The microstructure of the clad coatings were observed by scanning electron microscopy (SEM). A microhardness tester was used to measure the microhardness. The crystallographic phase of the clad coatings was determined by an x-ray diffractometer. The friction and wear behavior of the coatings were examined with a block-on-ring friction and wear tester. Then the worn surface of various coatings were analyzed through SEM. The experimental results showed that the addition of RE can refine the microstructure, increase the microhardness and change the crystallographic phase. As a result by RE the friction coefficient of the coatings was decreased and the wear resistance of the coatings was improved. The worn surface of the clad coatings containing RE was less severely destroyed than that without RE.