ANALYSIS OF THE WAVE DEFORMATION OF THIN COATINGS IN SLIDING POINT CONTACT

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ANALYSIS OF THE WAVE DEFORMATION OF THIN COATINGS IN SLIDING POINT CONTACT

Journal Title: Tribologia - Year 2012, Vol 245, Issue 5

Abstract

This paper presents an analysis of the wave deformation nature of the friction track in a sliding point contact. The object of this study was a composite nickel-molybdenum coating reinforced by the particles of aluminium oxide (Ni-Mo/Al2O3) with a thickness of about 5.6 μm, which was deposited by an electrochemical method on a steel substrate. Tribological properties of the coatings were determined in a nonlubricated contact with an alumina ball of 1 mm diameter. The coating has good adhesion to the substrate, and its destruction in the scratch test consisted of a cohesive cracking at a load of about 21 N. The hardness of the coating equalled 6.9 GPa, and a Young's modulus of 183 GPa was determined by instrumental method. In order to explain the phenomena occurring in the microareas of the contact, the groove geometry was measured using a profilometer, and the microstructure analysis of its surface was performed using different techniques. Based on the contact mechanics, an attempt to interpret the formation mechanism of the characteristic, cyclically repeating, stereometric shape formed in a groove was performed. The impact of kinematic parameters of tribological tests on the phenomenon of wave deformation of subsurface layers as well as the final form of the deformation (the cyclically recurring pits with the shape of half a drop) was confirmed.

Authors and Affiliations

Sławomir Zimowski, Wiesław Rakowski

Keywords

coating point contact friction shape of groove

EP ID EP270421
DOI -
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