Abstract
To compare the merits of Ni and Cu, the mechanical and tribological properties of CrBN coatings modified by Ni or Cu incorporation were studied. The results demonstrated that the CrBN-Cu coatings presented a lower friction coefficient than CrBN and CrBN-Ni coatings owing to the improved lubrication effect of the CuO layer originating from the tribochemical reaction. However, the hardness decline due to Cu incorporation was much greater than that of Ni incorporation. Thus, the CrBN-Cu coatings exhibited a higher wear rate than the CrBN coating. In contrast, the plastic deformation enhancement induced by Ni incorporation exceeded the hardness decline. Therefore, the wear of CrBN-Ni coatings partially turned to plastic deformation to present a lower wear rate than that of the CrBN coating.
Highlights
Helicopters are important transport modes for both civil and military use [1]
Transition metal nitride coatings incorporated with non-metal elements—such as C, Si, and B—present high hardness and good wear resistance owing to the reinforcement effect of the nanocomposite structure [6]
The friction coefficient of the tribo-pairs could be automatically calculated from the friction force collected by the tribometer
Summary
Helicopters are important transport modes for both civil and military use [1]. The bearings and hinges in the airscrew system are crucial transmission components to ensure the stable operation of the helicopter. To prolong the service life of transmission components, hard coatings have been widely used to prevent wear [2,3,4,5]. Transition metal nitride coatings incorporated with non-metal elements—such as C, Si, and B—present high hardness and good wear resistance owing to the reinforcement effect of the nanocomposite structure [6]. Many studies have focused on the crack resistance modification of transition metal nitride coatings by tough metal incorporations, such as Ni [12, 13], Cu [14], Ag [15, 16], Au [17], Al [18], Nb [19], Ti/Al [20], and Cu/Cr [21]. The wear resistance of transition metal nitride coatings was enhanced [13,14,15]
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