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Tribological Investigation of ZrO2 Coated Steel Disks Under Dry Lubricated Conditions

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Ceramics are being extensively used as materials for tribological applications due to their high wear resistance. However, the brittleness of ceramics limits their usage in high load bearing applications. Ceramics in the form of coatings are also being used for low load conditions in engineering applications. The delamination of coating is an issue of concern with the ceramic coatings. The delamination is dependent on the operating conditions and also on the hardness of the contacting surfaces. In this context tribological study of ZrO2 coated steel disks has been carried out to investigate the influence of contacting surfaces on the life of the ceramic coating. Experimental investigations have been performed on ZrO2 coated steel disks in contact with the EN-31 steel, Gunmetal and Aluminum alloy disk specimens. The experiments have been performed on Amsler disk-on-disk tribo-tester under dry conditions. The value of frictional force has been carefully studied. The criterion for contact failure has been marked as significant rise in frictional force. The results have revealed that the delamination is significantly influenced by the hardness of the contacting surfaces. The contact between the ZrO2 coated and EN-31 steel disk reported longer useful life as compared to the ZrO2-Gunmetal and the ZrO2-Alurninum alloy disks. This reflects that for longer useful life with the ceramic materials the contacting surfaces should have an optimum equivalent hardness.
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Keywords: Disk-On-Disk Tribo-Tester; Dry Lubrication; Steel; Tribology; ZrO2 Coating

Document Type: Research Article

Affiliations: Advanced Tribology Research Centre, CSIR-Indian Institute of Petroleum, Dehradun 248005, India

Publication date: November 1, 2016

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