In the present work, a laser beam was used to cover, with graphite (solid lubricant material) mixed with alpha alumina (α-Al 2 O 3 ), surfaces samples of AISI 4340 steel.The proportion of each component used was 50%, mixed in a planetary ball mill for 2 hours.A CO 2 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.
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Vasconcelos et al. (2024) studied this question.
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