Sub-micron structuring/texturing of diamond-like carbon-coated replication masters with a femtosecond laser

Springer Science and Business Media LLC - Tập 126 Số 2 - 2020
Aleksandra Michalek1, Shaojun Qi2, Afif Batal1, Pavel Penchev1, Hanshan Dong2, Tian Long See3, Stefan Dimov1
1School of Mechanical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
2School of Metallurgy and Materials, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
3The Manufacturing Technology Centre Ltd, Pilot Way, Ansty Park, Coventry, CV7 9JU, UK

Tóm tắt

AbstractDiamond-like carbon (DLC) coatings have very attractive mechanical and tribological properties, i.e. high hardness, low friction and high wear resistance. Therefore, DLC is often used as a solid lubricant in moulds for injection moulding. Laser processing of DLC with ultrashort lasers, i.e. femtosecond lasers, can be performed both at micron and sub-micron scales, namely by producing laser-induced periodic surface structures (LIPSS). In this research, the effects of laser structuring/texturing on DLC properties are investigated. First, the laser-processing parameters were optimised to produce uniform LIPSS without damaging a thin DLC film and then the properties of the textured DLC-coated substrates were studied. It was determined that the tribological properties of the processed surfaces remained unchanged, but the hardness of the structured/textured DLC layers was reduced significantly. Although GAXRD and Raman spectroscopy did not show any significant crystallisation of the DLC coating after the laser irradiation, the analysis indicated that a thin graphitised layer had been formed on the surface as a result of the femtosecond laser processing.

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Tập 126 Số 2

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