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    Combined surface hardening and laser patterning approach for functionalising stainless steel surfaces

    Year: 2018

    Journal: Appl. Surf. Sci., Volume 439, MAY 1, page 516–524

    Authors: Garcia-Giron, A.; Romano, J. M.; Liang, Y.; Dashtbozorg, B.; Dong, H.; Penchev, P.; Dimov, S. S.

    Organizations: Marie Sklodowska-Curie grant [675063]; H2020 FoF programme, project on "Modular laser based additive manufacturing platform for large scale industrial applications" (MAESTRO); H2020 FoF programme, project on "High-Impact Injection Moulding Platform for mass-production of 3D and/or large micro-structured surfaces with Antimicrobial, Self-cleaning, Anti-scratch, Anti-squeak and Aesthetic functionalities" (HIMALAIA)

    Keywords: Laser patterning; Nanosecond laser; Hydrophobicity; Plasma surface alloying; Hardening; Surface engineering

    The paper reports a laser patterning method for producing surfaces with dual scale topographies on ferritic stainless steel plates that are hardened by low temperature plasma surface alloying. Nitrogen and carbon based gasses were used in the alloying process to obtain surface layers with an increased hardness from 172 HV to 1001 HV and 305 HV, respectively. Then, a nanosecond infrared laser was used to pattern the plasma treated surfaces and thus to obtain super-hydrophobicity, by creating cell-or channel-like surface structures. The combined surface hardening and laser patterning approach allowed super-hydrophobic surfaces to be produced on both nitrided and carburised stainless steel plates with effective contact angles higher than 150 degrees. The hardened layers on nitrided samples had cracks and was delaminated after the laser patterning while on plasma carburised samples remained intact. The results showed that by applying the proposed combined approach it is possible to retain the higher hardness of the nitrided stainless steel plates and at the same time to functionalise them to obtain super-hydrophobic properties. (C) 2018 Elsevier B.V. All rights reserved.
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