Abstract
Titanium nitride (TiN) coatings are widely used in machining because of its mechanical characteristics which modify the surface of the substrate increasing the capacity of load support and reduction of friction, while a coating as diamond-like carbon (DLC), which also has interesting mechanical properties, needs better attention. In this sense, the development of new coatings such as DLC is as important as wear analysis techniques. This work discusses the methods available to assess abrasive wear of coatings. For this, it has been used the data of the crater volume formed in ball cratering test and compared the difference between the specific wear coefficients of substrate and coating (ks and kc). These coefficients depend of the methods used for data analyses, thus, it has been used four equations to calculate ks and kc. Moreover, profilometry (pf) has been used to calculate the volumes, and thus ks and kc. Also, the roughness of the coatings, the thickness, the images corresponding to the crater formed, the coefficient of friction, the data obtained in wear tests due to the volume removed and, in the end, a comparison between ks and kc by different methods of data analyzes are presented.
Highlights
Cutting tools with titanium nitride (TiN) coating are widely used due its mechanical properties such as high wear resistance and low friction
This paper discusses the methods to evaluate the shape of the crater formed in the ball cratering test and the influence of the accuracy in the specific wear rate of TiN and diamond-like carbon (DLC) coatings
Interesting results for the DLC wear coefficients were calculated by Vc-At and DI, which show significant difference between ks and kc, indicating that the wear of the coatings were lower than the substrate
Summary
Cutting tools with titanium nitride (TiN) coating are widely used due its mechanical properties such as high wear resistance and low friction. There are few successful methods of wear test, for example: ball bearing, pin on disk and ball on disk Those techniques are common, new approaches of data analyses are being raised by tribologists. After a fixed number of revolutions, the volume of the crater formed is used to calculate the wear Advantages of this test are: the operation simplicity, the low cost of the apparatus and the small scale of the samples. A sequence of craters with different duration penetrates the coating, producing two boundaries on overall crater diameter and the portion of the crater in the substrate Dimensional analysis of these features results in wear rates for both the substrate and the coating. This paper discusses the methods to evaluate the shape of the crater formed in the ball cratering test and the influence of the accuracy in the specific wear rate of TiN and DLC coatings. The sets of coatings tested here were useful to provide information on the wear and friction performance of the DLC, giving guidance in the application of this coating in sliding wear applications, since TiN is widely known
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