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Open AccessArticle

Specific Features of Reactive Pulsed Laser Deposition of Solid Lubricating Nanocomposite Mo–S–C–H Thin-Film Coatings

1
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe sh., 31, 115409 Moscow, Russia
2
Immanuel Kant Baltic Federal University, A. Nevskogo St 14, 236016 Kaliningrad, Russia
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(12), 2456; https://doi.org/10.3390/nano10122456
Received: 20 November 2020 / Revised: 4 December 2020 / Accepted: 6 December 2020 / Published: 8 December 2020
(This article belongs to the Special Issue Laser Synthesis of Nanomaterials)
This work investigates the structure and chemical states of thin-film coatings obtained by pulsed laser codeposition of Mo and C in a reactive gas (H2S). The coatings were analysed for their prospective use as solid lubricating coatings for friction units operating in extreme conditions. Pulsed laser ablation of molybdenum and graphite targets was accompanied by the effective interaction of the deposited Mo and C layers with the reactive gas and the chemical states of Mo- and C-containing nanophases were interdependent. This had a negative effect on the tribological properties of Mo–S–C–H nanocomposite coatings obtained at H2S pressures of 9 and 18 Pa, which were optimal for obtaining MoS2 and MoS3 coatings, respectively. The best tribological properties were found for the Mo–S–C–H_5.5 coating formed at an H2S pressure of 5.5 Pa. At this pressure, the x = S/Mo ratio in the MoSx nanophase was slightly less than 2, and the a-C(S,H) nanophase contained ~8 at.% S and ~16 at.% H. The a-C(S,H) nanophase with this composition provided a low coefficient of friction (~0.03) at low ambient humidity and 22 °C. The nanophase composition in Mo–S–C–H_5.5 coating demonstrated fairly good antifriction properties and increased wear resistance even at −100 °C. For wet friction conditions, Mo–S–C–H nanocomposite coatings did not have significant advantages in reducing friction compared to the MoS2 and MoS3 coatings formed by reactive pulsed laser deposition. View Full-Text
Keywords: reactive pulsed laser deposition; solid lubricants; nanocomposite; molybdenum sulfides; coefficient of friction; wear; diamond-like carbon reactive pulsed laser deposition; solid lubricants; nanocomposite; molybdenum sulfides; coefficient of friction; wear; diamond-like carbon
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MDPI and ACS Style

Fominski, V.; Fominski, D.; Romanov, R.; Gritskevich, M.; Demin, M.; Shvets, P.; Maksimova, K.; Goikhman, A. Specific Features of Reactive Pulsed Laser Deposition of Solid Lubricating Nanocomposite Mo–S–C–H Thin-Film Coatings. Nanomaterials 2020, 10, 2456. https://doi.org/10.3390/nano10122456

AMA Style

Fominski V, Fominski D, Romanov R, Gritskevich M, Demin M, Shvets P, Maksimova K, Goikhman A. Specific Features of Reactive Pulsed Laser Deposition of Solid Lubricating Nanocomposite Mo–S–C–H Thin-Film Coatings. Nanomaterials. 2020; 10(12):2456. https://doi.org/10.3390/nano10122456

Chicago/Turabian Style

Fominski, Vyacheslav; Fominski, Dmitry; Romanov, Roman; Gritskevich, Mariya; Demin, Maxim; Shvets, Petr; Maksimova, Ksenia; Goikhman, Alexander. 2020. "Specific Features of Reactive Pulsed Laser Deposition of Solid Lubricating Nanocomposite Mo–S–C–H Thin-Film Coatings" Nanomaterials 10, no. 12: 2456. https://doi.org/10.3390/nano10122456

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