Abstract
The present research paper aims to evaluate the tribological behavior of coatings in applications where high wear resistance and low friction are required, commonly used in refurbishment of various items of industrial equipment. Twelve tribological pairs made of six different coatings, corresponding to three different coating families, have been studied: TiSiN, Cr, and DLC (diamond-like carbon). The coatings were produced using a technique called high power impulse magnetron sputtering (HiPIMS). To perform the tribological tests, two methods were used to measure friction, namely energy dissipation in vibratory systems and sliding indentation. The first technique is based on the evaluation of free vibration movement with damping of a mass–spring system induced by a mechanical impulse where the contact between the vibrating device and the sample to be analyzed acts as an additional energy dissipation. At the same time, friction is determined through the inverse analysis by comparing the experimental vibratory movement with the analytical equation of the movement. The determination of the load-bearing capacity of the various coatings has been evaluated using sliding indentation tests against spherical bodies using a constant sliding speed and increasing normal loads. The results obtained in both tests allow to verify a relationship between the friction coefficients of the studied tribological pairs: µDLC < µTiSiN < µCr. This relationship does not occur in the case of the vibration test with the 100Cr6 counter-body.
Highlights
Friction and wear are two of the three phenomena studied by tribology and are identified as one of the main consumers of material and energy resources, which can be significantly optimized through various surface engineering techniques, such as the use of heat treatments, thermochemical surface treatments, and application of coatings, among others
Friction losses represent up to 25% of the energy consumed in paper pulp production processes [2] and 40% in mining equipment [3], corresponding on about 20% of the energy consumed by the industry [4]
Using the advantages resulting from the use of new materials and surface engineering, concerning coatings, it will be possible to obtain significant reductions in friction and wear losses, which will result in substantial energy gains and reduced CO2 emissions [4]
Summary
Friction and wear are two of the three phenomena studied by tribology and are identified as one of the main consumers of material and energy resources, which can be significantly optimized through various surface engineering techniques, such as the use of heat treatments, thermochemical surface treatments, and application of coatings, among others. Friction losses represent up to 25% of the energy consumed in paper pulp production processes [2] and 40% in mining equipment [3], corresponding on about 20% of the energy consumed by the industry [4]. Using the advantages resulting from the use of new materials and surface engineering, concerning coatings, it will be possible to obtain significant reductions in friction and wear losses, which will result in substantial energy gains and reduced CO2 emissions [4]
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