研究目的
Investigating the effects of femtosecond laser structuring/texturing on the properties of diamond-like carbon (DLC) coatings, focusing on the generation of laser-induced periodic surface structures (LIPSS) and their impact on the mechanical and tribological properties of DLC.
研究成果
Femtosecond laser processing of DLC coatings can generate uniform LIPSS without damaging the film, although it leads to a significant reduction in hardness. The tribological properties of the processed surfaces remain largely unchanged. The study suggests that femtosecond laser structuring/texturing of DLC coatings is beneficial for producing replication masters with functional sub-micron structures while preserving the coatings' advantageous properties.
研究不足
The study focused on the effects of femtosecond laser processing on DLC coatings, but the long-term wear performance of the laser-treated surfaces was not investigated. Additionally, the study did not explore the effects of laser processing on DLC coatings with varying thicknesses or compositions.
1：Experimental Design and Method Selection:
The study involved optimizing femtosecond laser-processing parameters to produce uniform LIPSS on DLC coatings without damaging the film. The effects of these parameters on the properties of the textured DLC-coated substrates were then studied.
2：Sample Selection and Data Sources:
A thin DLC film was deposited on 316L stainless steel substrates using plasma-assisted chemical vapour deposition (PACVD).
3：List of Experimental Equipment and Materials:
A femtosecond ytterbium-doped fibre laser source was used for laser processing. Characterization tools included atomic force microscope (AFM), scanning electron microscope (SEM), Raman spectroscopy, glancing angle X-ray diffraction (GAXRD), and a ball-on-plate tribometer.
4：Experimental Procedures and Operational Workflow:
The laser-processing parameters were varied to study their effects on LIPSS generation and DLC properties. The resulting surfaces were analyzed for their topographical, structural, and tribological properties.
5：Data Analysis Methods:
The uniformity and periodicity of LIPSS were assessed using 2D fast Fourier transformation (2D FFT) of SEM and AFM images. Raman spectra were fitted with Lorentzian and Breit–Wigner–Fano profiles for D and G peaks, respectively.
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