Wear characteristics of nanoporous alumina and copper filled nanocomposite coatings

Muthukumar, M and Yadav, A and Bobji, MS (2020) Wear characteristics of nanoporous alumina and copper filled nanocomposite coatings. In: Wear, 462-46 .

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Abstract

Anodisation of pure aluminium under certain conditions, form nanoporous alumina (NPA) with highly ordered pores. High interface strength and hardness make NPA an ideal tribological coating. The nanopores can be filled with metals using electrodeposition to give rise to a nanocomposite coating with better tribological properties. In this study, the friction and wear behaviour of NPA and copper filled nanocomposite coatings are studied under dry reciprocation conditions with a hard zirconia ball. The coefficient of friction of NPA and the nanocomposite is found to be about 0.95. Wear particles are generated by the propagation of surface microcracks and possibly by compaction. From the SEM images of the wear tracks, it is found that these wear particles form a protective tribolayer. The wear process of the coatings is characterised by three distinct regimes of constant wear rate, low wear, and catastrophic failure. The coating fails, possibly by radial cracking, when the thickness of the unworn coating reaches a critical value. Uniform filling of copper in the nanopores is found to enhance the wear life. © 2020 Elsevier B.V.

Item Type:	Journal Article
Publication:	Wear
Publisher:	Elsevier Ltd
Additional Information:	The copyright of this article belongs to Elsevier Ltd
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	15 Dec 2020 11:17
Last Modified:	15 Dec 2020 11:17
URI:	http://eprints.iisc.ac.in/id/eprint/67076

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