Tribological Behavior Of TiN Coatings Prepared By PVD Reactive Deposition

TiN has many advantages, such as high hardness, high melting point, good thermal stability, excellent wear resistance and so on. In this essay, a series of TiN coated carbide tool were developed, and extensive researches were carried out on its mechanical properties, microstructure stress status and failure mechanisms.TiN coatings were deposited onto cemented carbide and Ti interlayer using magnetron sputtering ion plating process.Results show that: the mechanical properties of TiN coating tool is superior uncoated carbide tool.Dry friction and wear tests between TiN coated tool with quenched 45# steel at room temperature were conducted.Results showed that the friction coefficient and the wear rates of the uncoated tools were higher than TiN coatings.The friction coefficient of uncoated tools YT15 is 0.42 and the wear rate of YT15 is 1.4mg/h,therefore the fr iction coefficient of coated tool YT15 is 0.31 and the wear rate of YT15 is 1.0mg/h. The friction coefficient decreased at first and then increased with the applied load and the increase of the sliding speed.The wear rates increased with the increase of the applied load, decreased with the increase of the sliding speed.TiN coatings were better bonded to YG6 cementde carbide substrate than YT15 cemented carbide substrate under the condition of the same deposition technique.TiN coatings were observed in an SEM during the abrasive wear tests with quenched 45# steel as counterpart.SEM observations showed that :with a lesser load, the friction surface relatively flat, with a larger load, the friction surface relatively rough; in low-speed, the friction coating is very rough, deep groove-wear track and a lot of hard particles falling after the wear, in the high-speed, the friction surface relatively smooth. Wear mechanisms of TiN coatings were mostly abrasive wear and britleness break of coating.Determine the speed, load, lubrication style, the types of knives and other factors.Orthogonal analysis results show the best conditions of the carbide blade...