The focus of this study is to assess the influence of a selective post-deposition laser treatment on the tribological and wear behavior of a titanium coating layer on aluminum. Titanium grade 2 powders were deposited onto an aluminum alloy AA2024-T3 sheet, by means of cold gas dynamic spray process. A selective laser post-treating was carried out by using a 220 W diode laser to enhanced wear properties of coatings. Tribo-tests were executed to analyze the tribological behavior of materials in contact with an alternative moving counterpart under a controlled normal load. Tribo-tests were performed on untreated aluminum sheets, titanium grade 2 sheet, as-sprayed titanium powders and laser-treated coating layer to compare the wear properties of different materials and the effectiveness of treatment. The results obtained proved the effectiveness of the laser treatment in improving the wear performances of the coating, in terms of both friction coefficient and mass lost. The laser treatment promotes a change of the wear mechanism, switching from a severe adhesive wear, resulting in the Galling phenomenon, to an abrasive wear.

Influence of Selective Post-Deposition Laser Treatment on Tribological and Wear Properties of Cold Sprayed Titanium Coatings

RUBINO, FELICE;CARLONE, PIERPAOLO;RUGGIERO, Alessandro;MEROLA, MASSIMILIANO;
2015-01-01

Abstract

The focus of this study is to assess the influence of a selective post-deposition laser treatment on the tribological and wear behavior of a titanium coating layer on aluminum. Titanium grade 2 powders were deposited onto an aluminum alloy AA2024-T3 sheet, by means of cold gas dynamic spray process. A selective laser post-treating was carried out by using a 220 W diode laser to enhanced wear properties of coatings. Tribo-tests were executed to analyze the tribological behavior of materials in contact with an alternative moving counterpart under a controlled normal load. Tribo-tests were performed on untreated aluminum sheets, titanium grade 2 sheet, as-sprayed titanium powders and laser-treated coating layer to compare the wear properties of different materials and the effectiveness of treatment. The results obtained proved the effectiveness of the laser treatment in improving the wear performances of the coating, in terms of both friction coefficient and mass lost. The laser treatment promotes a change of the wear mechanism, switching from a severe adhesive wear, resulting in the Galling phenomenon, to an abrasive wear.
2015
9788192619620
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/4662780
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