Three kinds of coatings had been prepared on the surface of 45CrNi steel plates using laser
cladded technique by adding Mo and CeO2 into the Nickel-based alloys. The wear behaviors of these
three kinds of coatings in sliding against Al2O3 grinding ring were investigated by using a MM-200
Wear Tester. The results indicated that the addition of both Mo and CeO2 could improve the wear
resistance of Nickel-based alloy coatings. If the original Nickel-based alloy coating was taken as the
standard sample, the relative wear resistances of Mo-modified and Ce-modified coatings are 1.31 and
7.54 respectively, and the coefficients of friction appreciably decreased. SEM images of the worn
surface of the coatings showed that the wear of original Nickel-based alloy coating was dominated by
the mechanism of micro-cutting, and the Mo-modified coating and Ce-modified coating had a feature
of fatigue wear in addition to micro-cutting. In sliding, the wearing resistance of Ce-modified coating
was higher than the other two. The wear test results were closely related to the microstructures of the
coatings.
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