Abstract
Pin-on-disc experiments are conducted to investigate the tribological performance of untextured and textured brass surfaces with TiN coatings under oil lubrication. The surface texture is designed as a dimple pattern with different diameters and depths for the transverse surfaces of brass pins. After texturing, a TiN coating is deposited through pulsed-bias arc ion plating in a pure N2 atmosphere using a Ti target. Three dimple diameters are used, namely 130 μm, 150 μm, and 170 μm, along with three dimple depths, namely 15 μm, 40 μm, and 60 μm. The TiN coating is around 5 μm thick. Friction tests are conducted under different rotation speeds and loads, and the interfacial adhesion is assessed via a scratch test. Compared to the untextured surface, the textured one offers improved tribological behavior in mixed lubrication because the dimples generate hydrodynamic lift. To reduce friction in the case of higher speed and lower load, the optimum texture parameters are a diameter of 150 μm and a depth of 40 μm.
Highlights
Because of desirable corrosion and erosion resistance, high inertness and hardness and outstanding optical and electronic properties, titanium nitride (TiN) coating is widely used in industrial applications,2–5 such as for tools and mechanical components and in the biomedical field
Most investigations to date of the tribological performance of textured TiN coatings have been focused on steel surfaces10–12 and with a preference for either boundary lubrication or dry friction10,13,14 By contrast, studies are lacking of the frictional behavior of dimple-textured TiN coatings on brass surfaces at low speed and small load
Because the rotation speed and applied load involved in the friction tests were influenced by the mechanical property of the coatingsubstrate system, the interfacial adhesion and bonding strength were investigated in this study
Summary
As one of the most well-established engineering materials, titanium nitride (TiN) has been considered as a superhard material for protective coatings since the early 1970s.1 Because of desirable corrosion and erosion resistance, high inertness and hardness and outstanding optical and electronic properties, TiN coating is widely used in industrial applications, such as for tools and mechanical components and in the biomedical field. TiN coatings can be deposited by either physical or chemical vapor deposition, and this mature processing technology has accelerated their application worldwide. Another general technique that has been used since the 1960s to enhance the tribological performance of contact surfaces is surface texturing. Most investigations to date of the tribological performance of textured TiN coatings have been focused on steel surfaces and with a preference for either boundary lubrication or dry friction By contrast, studies are lacking of the frictional behavior of dimple-textured TiN coatings on brass surfaces at low speed and small load. The objective is to evaluate the tribological performance of dimple-textured TiN-coated brass surfaces with various dimple diameters and depths under mixed-to-hydrodynamic lubrication
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