Abstract: Nanostructured and conventional WC–12Co coatings were prepared by HVOF spraying. The properties of adhesion,hardness and erosion resistance of two coatings were investigated. The characterizations of spraying powders,microstructure and surface morphology of coatings were analyzed by SEM. The results indicated that nanostructured WC–12Co coating showed better properties not only in density and hardness but also in distribution of WC and resistance of erosion than that of conventional. Micohardness reached to 1610 HV, about1.5 times that of conventional coating. Erosion rate reduced about half of the rate of conventional coating.
Key words: HVOF；Nanostructured coatings；WC–12Co
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