Laser deposition of alumina and carbon black on AISI 4340 steel

• Autores: G. Vasconcelos, V Teleginski, N.A.M. Athanazi, G.C.C. Coreard, A.C. Oliveira
• Localización: Proceedings of the VIII Iberian Conference on Tribology: Conference proceedings / Ana Eva Jiménez Ballesta (aut.), Tulia Espinosa Rodríguez (aut.), Noelia Saurín Serrano (aut.), Joaquín Arias Pardilla (aut.), María Dolores Bermúdez Olivares (aut.), 2015, ISBN 978-84-606-8904-1, págs. 303-307
• Idioma: inglés
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• Resumen

  • In the present work, a laser beam was used to cover, with graphite (solid lubricant material) mixed with alpha alumina (a-Al2O3), surfaces samples of AISI 4340 steel. The proportion of each component used was 50%, mixed in a planetary ball mill for 2 hours. A CO2 laser beam of 125 W and 0.2 mm beam diameter was used to irradiate the samples previously coated with the powders. The reduced friction of the mechanical part was confirmed by a tribo-tester in a reciprocal mode. Friction near to 0.15 was obtained with substrate steel hardened to 900 Hv with a ceramics top coating.