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- Title
Graphite Surface Microhardening with Femtosecond Laser Pulses.
- Authors
Romashevskiy, S. A.; Pronkin, A. A.; Ashitkov, S. I.; Agranat, M. B.
- 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.
- Subjects
FEMTOSECOND pulses; POLYCRYSTALS; GRAPHITE; ELASTICITY; NANOINDENTATION tests; AMORPHOUS carbon; MICROHARDNESS; RAMAN spectra
- Publication
High Temperature, 2018, Vol 56, Issue 4, p616
- ISSN
0018-151X
- Publication type
Article
- DOI
10.1134/S0018151X18040235