A tribo-oxidation abrasive wear model to quantify the wear rate of a cobalt-based alloy subjected to fretting in low-to-medium temperature conditions. (September 2018)

• Record Type: Journal Article
• Authors: Dréano, Alixe; Fouvry, Siegfried; Guillonneau, Gaylord
• Is Part Of: Tribology international. Volume 125(2018)
• Page Start: 128
• Page End: 140
• Publication Date: 2018-09
• Subjects: Fretting -- Oxidative wear -- Abrasive wear -- Wear transition; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2018.04.032
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: Wear mechanisms of cobalt-based alloys are commonly known to be dependent on temperature: above a glaze layer transition temperature, wear rates are very low and a compacted oxidized compliant debris layer is spontaneously created in the contact. The present study focuses on the high wear rate mechanism occurring below this transition temperature of a HS25/alumina contact subjected to gross-slip fretting. The investigation shows that the wear volume is proportional to the product of the Archard's work multiplied by the oxide thickness generated between each fretting sliding pass. A simple tribo-oxidation wear model was developed and a very good correlation was observed with experiments as long as the compaction of debris layer leading to a glaze layer structure was not activated. Highlights: Wear is investigated for a cobalt-based alloy/ceramic contact between 20 and 600 °C. At low temperature, wear is severe combining an oxidative and an abrasive process. The formulation of a tribo-oxidation abrasive law is proposed. The good correlation with experiments confirms the relevance of this wear model.