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Dry sliding tribology of dioctyldithiophosphoric acid deposited on steel at $150{^o}$C

Nalama, PC and Sarinb, R and Biswasa, SK (2006) Dry sliding tribology of dioctyldithiophosphoric acid deposited on steel at $150{^o}$C. In: Tribology Letters, 23 (3). pp. 231-241.

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Dioctyldithiophosphoric acid was deposited on 7 nm (RMS) rough steel surfaces at 150 degrees C to create a densely packed (area-95%) deposit of glassy phosphate islands of maximum 500 nm height. This standard substrate was subjected to dry lubricated ball-on-disc tribology using a 2 mm diameter steel ball in the 25-500 mN normal load range at a sliding velocity of 1 mm/s. The experiments recorded friction coefficient of the order of 0.18 but the life of the film as it wears out with sliding distance was found to decline with increasing load. The life-load characteristics that we record in these experiments, we argue, can only be explained if there is a load induced growth of the deposited film during sliding. We record this load induced growth to yield phosphate islands which are significantly smaller but harder than those grown by thermal activation alone.

Item Type: Journal Article
Publication: Tribology Letters
Publisher: springer
Additional Information: Copyright of this article belongs to springer.
Keywords: dioctyldithiophosphoric acid;tribology steel.
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 23 Mar 2009 07:07
Last Modified: 19 Sep 2010 04:55
URI: http://eprints.iisc.ac.in/id/eprint/17086

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