Effect of lubrication on the wear behaviour of CrN coating deposited by PVD process

Abstract

This paper investigates the effect of SAE grade 20W50 engine oil as a lubricant on the wear behaviour of chromium nitride (CrN) coating deposited by PVD process at higher loads and speeds by pin on disc tribometer. The specific wear rate ranges from 9.82 × 10-5 to 2.87 × 10-5 mm 3 /Nm in dry condition whereas in lubricated condition 0.97 × 10-5 to 0.19 × 10-5 mm 3 /Nm. Successive increase of speed and load rises the temperature of wear track from 65°C to 178°C in dry condition while 34°C to 40°C in lubricated conditions results to decrease in friction coefficient, which has immense influence on the wear resistance of coating. The wear mechanism of the coatings was analysed by SEM and EDS and found deformation, cracks and, nitride particle pull-out, built up edge formation, erosion and adhesive wear coupled with oxidation wear. The highlights of the paper are: 1) tribology of CrN coating against cylinder liner material as counter face summarised; 2) research has practical Effect of lubrication on the wear behaviour of CrN coating 61 applications for piston ring with the influence of engine oil; 3) temperature ranges from 65°C to 178°C in dry and 34°C to 39°C in lubrication during wear test; 4) the wear mechanism is combination of three body abrasion, metal transfer and oxidation.

Analysis of Physical and Mechanical Properties of Galvanic-Plasma Wear-Resistant Coatings

“…6). A piston with a coating based on oxyceramic with a hardness of 6.3-11.5 GPa was tested in [15,16]. It was also found in previous works that the wear rate of coated pistons is 3.86 times lower than that of uncoated ones [17,18].…”

Tribological Properties of Chromium Nitride on the Cylinder Liner under the Influence of High Temperature

“…Similar flakes as counter-body (FE-SEM) have been reported in the literature. The layer looks hard and white at the top that cannot make strength in the wear track at the same time because of the effect of applied normal load making that layer quickly break, thus it is unable to effectively slow down the effect of matrix wear [ 28 , 29 , 30 ].…”

The Concept of WC-CrC-Ni Plasma-Sprayed Coating with the Addition of YSZ Nanopowder for Cylinder Liner Applications

“…The CrN coating deposited in the PVD process was proposed by Singh et al [ 10 ] for the improvement of hypereutectic Al-Si alloys used for cylinder liners. The mechanisms of wear of CrN and counterbody surfaces in this type of coating at higher temperature (in the range of 20–300 °C) are abrasive wear accompanied by slight oxidation…”