Abstract
This paper focuses on the tribological behaviour of ZrN/ZrCN coating on bearing steel substrates DIN 17230, 100Cr6/1.3505. Coatings are applied at room temperature processes by means of Cathodic Arc Evaporation (CAE), a kind of Physical Vapor Deposition (PVD) technique. In order to achieve a satisfactory compromise between coating-substrate adhesion and the surface roughness requirement of the bearing rings, a polish post-processing is proposed. Different polish post-processing times and conditions are applied. The coated and polished bearing rings are tested under real friction torque test protocols. These tests show that the application of the coating does not entail a significant improvement in friction performance of the bearing. However, fatigue tests in real test bench are pending to evaluate the possible improvement in bearing life time.
Highlights
Roller bearings are components with numerous uses for rotating applications, in the automotive industry
This paper focuses on the tribological behaviour of ZrN/ZrCN coating on bearing steel substrates DIN 17230, 100Cr6/1.3505
Roughness is represented on a horizontal axis in order to calculate an average of the peaks and valleys, and the roughness
Summary
Roller bearings are components with numerous uses for rotating applications, in the automotive industry. Nowadays, it is commonly expected that tribology can lead to the following technical considerations: improvements of the fuel consumption efficiency through friction reduction; lightweight construction; downsizing of some components through a resistance increase leading to higher Hertzian contact pressures; waste reduction due to a lower wear and less frequent oil changes; as well as the use of more environment-friendly lubricants (Bio-no-tox). Zr(C, N) thin coatings are considered because they have been successfully tested at a lubricant temperature of 120 ◦ C and, reach average Hertzian pressures of 1.94 GPa [38] From these results, this composition arises as a promising coating to be used in bearings for the automotive industries (differential applications) because they withstand similar working temperatures and contact stresses. In Kuhn et al [19], ZrC and ZrN are used for rolling bearings, but the results measured are more focused on the properties of the bearing material than on the functional results such as friction torque, as revealed in this paper
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