Overview

Original Research

WEAR RESISTANCE OF DLC COATED STEEL SUBSTRATES IN OIL LUBRICATION CONDITIONS FOR HYDRAULIC APPLICATIONS

KESHAV M 1, SHANMUKHA NAGARAJ 2, A BHARATISH 3, V A GIRISH 4, and UDAYASHANKAR S 5.

Vol 17, No 10 ( 2022 )   |  DOI: 10.5281/zenodo.7262699   |   Author Affiliation: Department of Mechanical Engineering, R.V. College of Engineering, Bengaluru, Karnataka-560059, India 1,2,3,4; Department of Mechanical Engineering, BTLITM, Bengaluru, Karnataka-560099, India 5.   |   Licensing: CC 4.0   |   Pg no: 1662-1675   |   To cite: KESHAV M, et al., (2022). WEAR RESISTANCE OF DLC COATED STEEL SUBSTRATES IN OIL LUBRICATION CONDITIONS FOR HYDRAULIC APPLICATIONS. 17(10), 1662–1675. https://doi.org/10.5281/zenodo.7262699   |   Published on: 28-10-2022

Abstract

The worldwide rotary pump market was estimated at around 00 million in 2020 and the market is supposed to increase by 20% toward the end of 2026, seeing a compounded annual growth rate of 3% over a period from 2022-2026. The scrapping of an engineered component made from non-renewable resources at an early stage in life due to wear goes against the ethics of the conservation of natural resources as the frictional processes lead to dissipation of a part of input energy. The objective of the this work was to obtain diamond-like carbon coating on high-speed steel samples and test them for better wear preventative behavior with different hydraulic fluids. The high-speed steel ball samples of 12.7 mm diameter were used as a substrate on which the diamond-like carbon coating was to be developed using the Radio-Frequency Plasma Enhanced Chemical Vapor Deposition (RF-PECVD) technique. The developed Diamond like Carbon coating was characterized by conducting X-Ray diffraction which suggested the coating to be of amorphous structure. In accordance with ASTM D4172, an investigation into the anti-wear characteristics of lubricating oil was carried out using the four-ball test. This test was carried out under certain conditions, including a higher load, a regulated temperature, and a constant rotational speed of the ball. The four ball results show that the coefficient of friction for samples reduces by around 36% when test oil 3 is used in uncoated samples and 48% in coated samples. Also, the wear rate for the test oil 3 for coated samples was found to be 0.7381x10-6 mm/Nm, which is the lowest wear rate among the other test oils. The outcome of the project is the reduction of coefficient of friction by 84% with respect to dry condition when test oil 3 is used. Hence, it can be concluded that test oil 3 is the best lubricant among the three test oils.

Keywords

High-Speed Steel Ball, Diamond Like Carbon Coating, Four Ball Test Wear Rate, Coefficient of Friction