Abstract
To improve the tribological properties of pure MoS2 coating, the MoS2–Zr composite lubricating coatings were prepared on the WC/TiC/Co carbide surface utilizing radio frequency magnetron sputtering method combining with multiple arc ion plating technology. The effects of different Zr target currents on the surface morphologies, roughness, Zr content, adhesive force, thickness, microhardness and tribological behaviors of the composite coatings were systematically investigated. Results showed that the properties of MoS2 coating can be remarkably enhanced through co-deposition of a certain amount of Zr. As the Zr target current increased, the Zr content, surface roughness, thickness, and micro-hardness gradually increased, while the adhesive force of coatings increased first and then decreased. The friction behaviors and wear modes of the composite coatings both varied obviously with the increase of Zr current. The mechanism was mainly attributed to the different components and mechanical properties of the coatings caused by various Zr current.
Highlights
Surface coatings prepared by physical vapor deposition (PVD) can improve physical and mechanical properties, and expand the industry applications of traditional material [1]
According to the material characteristics, the coatings can be classified into two primary types: hard coatings and lubricating coatings
Because substrate surface with composite coatings can no longer be seen owing to a significant increase in the thickness of the pure MoS2 coating was just about 0.55 μm, the grain structure of WC/TiC/Co substrate can still be seen through the surface coating
Summary
Surface coatings prepared by physical vapor deposition (PVD) can improve physical and mechanical properties, and expand the industry applications of traditional material [1]. According to the material characteristics, the coatings can be classified into two primary types: hard coatings and lubricating coatings. With the rapid development of material science and coating technology, the multi-component composite coatings and multilayer composite coatings, such as TiCN [5], AlCrN [6], TiAlN [7,8], CrSiCN [9], TiAlSiN [10,11,12] and so on [13], have attracted increasing research, which exhibit much higher surface hardness and more excellent tribological properties. As a widely known solid lubricant material, MoS2 is extensively applied in various fields such as lubricant additives, burnished coatings, and deposited coatings through the PVD method [20,21,22]. The solid or liquid lubricants containing MoS2 with additives cannot
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