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Proceedings Paper

UV laser ablation of silicon carbide ring surfaces for mechanical seal applications
Author(s): Giuseppe Daurelio; Alida Bellosi; Diletta Sciti; Giuseppe Chita; Didio Allegretti; Fausto Guerrini
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Paper Abstract

Silicon carbide ceramic seal rings are treated by KrF excimer laser irradiation. Surface characteristics, induced by laser treatment, depend upon laser fluence, the number of laser pulses, their energy and frequency, the rotation rate of the ring and the processing atmosphere. It was ascertained that silicon carbide has to be processed under an inert atmosphere to avoid surface oxidation. Microstructural analyses of surface and cross section of the laser processed samples showed that the SiC surface is covered by a scale due to the melting/resolidification processes. At high fluence there are no continuous scales on the surfaces; materials is removed by decomposition/vaporization and the ablation depth is linearly dependent on the number of pulses. Different surface morphologies are observed. The evolution of surface morphology and roughness is discussed with reference to compositions, microstructure and physical and optical properties of the ceramic material and to laser processing parameters. Preliminary results on tribological behavior of the treated seals are reported.

Paper Details

Date Published: 25 February 2000
PDF: 6 pages
Proc. SPIE 4070, ALT '99 International Conference on Advanced Laser Technologies, (25 February 2000);
Show Author Affiliations
Giuseppe Daurelio, Ctr. Laser (Italy)
Alida Bellosi, Research Institute for Ceramics Technology (Italy)
Diletta Sciti, Research Institute for Ceramics Technology (Italy)
Giuseppe Chita, Ctr. Laser (Italy)
Didio Allegretti, Meccanotechnica Umbra SpA (Italy)
Fausto Guerrini, Meccanotechnica Umbra SpA (Italy)

Published in SPIE Proceedings Vol. 4070:
ALT '99 International Conference on Advanced Laser Technologies
Vladimir I. Pustovoy; Vitali I. Konov, Editor(s)

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