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Proceedings Paper

Laser surface microtexturing on mechanical seal rings for enhancing tribological properties
Author(s): Didio Allegretti; Giuseppe Daurelio; Fausto Guerrini
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Paper Abstract

Laser texturing was performed on the sliding surface of silicon carbide sealing rings, in order to investigate the surface modification in relationships with the laser processing parameters and the tribological performances of the mechanical face seals. As no graphs or data sheets were found in literature on the surface absorption (or reflection) properties of the SiC versus the laser wavelengths, it was necessary to execute a series of screening tests using different laser sources, wavelengths (0.532 ?m, 0.810 ?m. 1.06 ?m and 10.6 ?m) and modes (Normal and Q Ñ Switch) to verify the surface absorption properties of the SiC seal faces. So far, only the pulsed CO2 laser irradiation was proved to be efficient in producing regular shaped holes. Hole size and microstructural modification were related to laser power, pulse duration and spot size. Under selected processing conditions, seal faces were regularly textured producing microholes (80 to 100 ?n diameter) at a distance of about 200 ?m (center to center of the holes). Tribological performances of these mechanical seals under specific proof tests evidenced the increase of the fluid film stiffness and seal life and the reduction of friction coefficient and torque values.

Paper Details

Date Published: 25 January 2001
PDF: 7 pages
Proc. SPIE 4184, XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference, (25 January 2001); doi: 10.1117/12.413989
Show Author Affiliations
Didio Allegretti, Meccanotecnica Umbra SpA (Italy)
Giuseppe Daurelio, Ctr. Laser Scrl (Italy)
Fausto Guerrini, Meccanotecnica Umbra SpA (Italy)

Published in SPIE Proceedings Vol. 4184:
XIII International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference
Antonio Lapucci; Marco Ciofini, Editor(s)

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