Studies on boundary lubrication properties of oxidised coconut and soy bean oils

Mannekote, Jagadeesh K and Kailas, Satish V (2009) Studies on boundary lubrication properties of oxidised coconut and soy bean oils. In: Lubrication Science, 21 (9). pp. 355-365.

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Abstract

Vegetable oils are a potential source of base oils for biodegradable lubricants, with limited oxidative stability. This study focuses on the effect of long-term ageing and the influence of oxidation products on the boundary lubrication performance of coconut and soy bean oils, by subjecting them to accelerated ageing in a dark oven at elevated temperature. The samples were collected at regular intervals and analysed for the changes in viscosity, percentage of free fatty acid and peroxide number compared to fresh oil samples. The boundary lubrication properties of these samples were evaluated using a four-ball tester. Increased wear observed with aged oil samples was linked to the destruction of triglyceride structure and formation of peroxides. The difference in the wear properties of soy bean oil to coconut oil was accounted by its high content of unsaturated fatty acids and its susceptibility to undergo oxidation. It was concluded that the coconut oil can perform as a better lubricant and has got a better storage life compared to soy bean oil.

Item Type:	Journal Article
Publication:	Lubrication Science
Publisher:	John Wiley and Sons
Additional Information:	Copyright for this article belongs to John Wiley and Sons.
Keywords:	vegetable oils; accelerated ageing; fatty acids; four-ball tester; oxidation and viscosity
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	03 Dec 2009 09:26
Last Modified:	19 Sep 2010 05:53
URI:	http://eprints.iisc.ac.in/id/eprint/25057

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