Abstract
The wear and friction behaviours of detonation-gun- (D-gun) and plasma-sprayed hard coatings were investigated under dry sliding conditions. The coating materials studied included Cr 2O 3, WC-12%Co, WC-20%Co, Al 2O 3, TiO 2, Al 2O 3-40%TiO 2, TiC-20%Ni and Cr 3C 2-25%NiCr. Sintered WC-6%Co and steel MoCN315M were also investigated as references. Scanning electron microscopy analysis was carried out to study the wear mechanisms. The results indicated that D-gun-sprayed hard coatings had higher hardnesses, densities and wear resistances than the corresponding plasma-sprayed coatings. D-gun-sprayed Cr 2O 3 showed the highest wear resistance among the materials studied. The wear resistance of D-gun-sprayed Cr 2O 3 was even higher than that of sintered WC-6%Co. As a result of this study, the wear-resistant order of D-gun- and plasma-sprayed hard coatings as well as sintered WC-6%Co was given.
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