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S. Murzin, V. Balyakin, C. Gachot et al.:
"Ultraviolet nanosecond laser treatment to reduce the friction coefficient of silicon carbide ceramics";
Applied Sciences, 11 (2021), 13 pages.

The determination of the possibility for the reduction of the friction coefficient of ceramic parts from silicon carbide by pulse-periodic treatment with an ultraviolet nanosecond laser was carried out in the framework of this research. The gas-dynamic seal of the compressor rotor of the gas-turbine engine after hot isostatic pressing and mechanical treatment was exposed to surface microstructuring in a pulse-periodic mode. For experimental investigations, a laser with a maximum energy of the pulse of 50 μJ, a wavelength of 355 nm, and a pulse duration below 10 ns was used. It was determined that the surface quality was improved, and the surface roughness was reduced as a consequence of the realized laser polishing modes in the beam exposure area. The average value of the friction coefficient of the ceramic material surface decreased by 15% as result of pulse-periodic laser processing.

ultraviolet nanosecond laser; silicon carbide ceramics; friction coefficient; surface mi- crostructuring; gas-dynamic seals

http://dx.doi.org/10.3390/app112411906