Abstract
The effects of direct femtosecond laser processing of a polycrystalline graphite surface are experimentally investigated. The functional graphite surfaces are fabricated at laser intensity of ~1017 W/cm2 in vacuum and then thoroughly analyzed by means of Raman spectroscopy and nanoindentation test. The measured Raman spectra at 257 nm show presence of an amorphous carbon phase containing sp3 hybridized carbon atoms and a discontinuous nanocrystalline diamond film, while the results of microhardness measurements demonstrate a sixteen-fold increase in microhardness as compared to the unirradiated graphite surface. The modulus of elasticity is found to increase nearly by 3.4 times.
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Romashevskiy, S.A., Pronkin, A.A., Ashitkov, S.I. et al. Graphite Surface Microhardening with Femtosecond Laser Pulses. High Temp 56, 616–619 (2018). https://doi.org/10.1134/S0018151X18040235
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DOI: https://doi.org/10.1134/S0018151X18040235