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Proceedings Paper

Discharge-aided reactive laser ablation for ultrafine powder production
Author(s): Ioan Chis; Aurelian Marcu; T. Yukawa; Dumitru Dragulinescu; Constantin Grigoriu; Dana Miu; Weihua Jiang; Kiyoshi Yatsui
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Paper Abstract

Ultrafine alumina powder was produced by aluminum target ablation with a Nd:YAG laser beam (1064 nm wavelength; 340 mJ/pulse energy; 7 ns pulse duration; 10 pps repetition rate), in a 120 Torr O2 atmosphere. A theoretical approach for the ablation process, based on laser energy absorption and energy balance in the target, is used for comparison with the experimental production rate. Three experimental irradiation conditions were chosen: (1) energy density of 5 J/cm2, considered reference (RDE), (2) lower energy density of 2.5 J/cm2 (LDE) and (3) RDE with auxiliary discharge between an auxiliary electrode and target, triggered by the ablation plume (RDA). Calculated and experimental data of target weight loss show good agreement (135 ng/pulse, calculated, and 100, 110, 120 ng/pulse, experimentally, for RDE, LDE, RDA conditions, respectively). The X-Ray Diffraction spectra of alumina show formation of (gamma) -alumina particles only, especially in LDE and RDA conditions. From Scanning Electron Microscopy size analysis, a decrease of particle size, in LDE and RDA irradiating conditions, is observed. The decrease of laser beam fluence or aiding of ablation using an auxiliary discharge is both favorable for the production of high quality powder, without diminishing the production rate. This can be a good basis for future improvement of the ultrafine powder production process.

Paper Details

Date Published: 2 July 1998
PDF: 11 pages
Proc. SPIE 3405, ROMOPTO '97: Fifth Conference on Optics, (2 July 1998); doi: 10.1117/12.312750
Show Author Affiliations
Ioan Chis, National Institute for Laser, Plasma, and Radiation Physics (Romania)
Aurelian Marcu, Nagaoka Univ. of Technology (Romania)
T. Yukawa, Nagaoka Univ. of Technology (Japan)
Dumitru Dragulinescu, National Institute for Laser, Plasma, and Radiation Physics (Romania)
Constantin Grigoriu, National Institute for Laser, Plasma, and Radiation Physics (Romania)
Dana Miu, National Institute for Laser, Plasma, and Radiation Physics (Romania)
Weihua Jiang, Nagaoka Univ. of Technology (Japan)
Kiyoshi Yatsui, Nagaoka Univ. of Technology (Japan)

Published in SPIE Proceedings Vol. 3405:
ROMOPTO '97: Fifth Conference on Optics
Valentin I. Vlad; Dan C. Dumitras, Editor(s)

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