Fabrication of Carbide Nanoparticles by Femtosecond Laser Ablation of Silicon and Molybdenum in Hexane

Terakawa, Shusaku; Xi, Yu; Asaka, Toru; Itoigawa, Fumihiro; Ono, Shingo; Sudo, Masaaki

doi:10.1364/cleopr.2018.w2e.5

Cited by 2 publications

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“…Then the metal of surface can be activated, and the oil be decomposed to generate radicals, so besides the general laser hardening effect, the surface modification of formation of hard metal carbide surface layer can also be expected. As using this method of laser induced carbonization, SiC and MoC nanoparticles have been successfully fabricated by femtosecond laser ablation of silicon and molybdenum plate in hexane (Yu et al, 2017;Terakawa et al, 2018). Therefore, we proposed a novel tribo-characteristic improvement technique by the formation of a hard metal carbide layer using ultra-short pulse laser irradiation, with the hydrocarbon of oil as a carbon source.…”

Section: Introductionmentioning

confidence: 99%

Surface modification technique of titanium alloy to improve the tribological properties using sub-ns laser irradiation in PAO oil

LIU

TANAKA

Fujiwara

et al. 2023

JAMDSM

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Titanium alloy is widely used in different industrial applications. For the surface modification to improve the tribological properties, laser irradiation is a promising technology, which offers high efficiency, and high automation potential and geometrical flexibility. In this study, a novel method of surface modification for titanium alloys by carbonization using low fluence of laser irradiation in the atmosphere of PAO oil is proposed. Results show that the carbon content on the surfaces significantly increases with the laser shot number, with the laser irradiated spot showing little change of Ra. XPS analysis confirms that the carbon from the oil has bonded to the Titanium inside the alloy. By comparison with that irradiated without oil, the hardness of that irradiated in oil is much higher, demonstrating the feasibility of the surface modification of titanium carbide layer generation. To investigate the tribological properties, laser scanning irradiation in oil with different laser pulses were carried out to create laser modified areas and reciprocating ball-on-disk friction tests under oil lubrication were conducted. The laser modified areas show friction of 0.13, much lower than that of the unirradiated which is approximate 0.55, and the sliding lifetime of low friction is also increased with the laser pulse number. Moreover, by introducing patterning laser irradiation onto the uniformly irradiated area, the wear resistance can be further greatly improved, and the sliding lifetime can extend to 13 times of the optimal result of uniform irradiation.

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Section: Introductionmentioning

confidence: 99%