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Proceedings Paper

Laser-synthesized silicon- and ferro-based nano powders
Author(s): Yong Liang; Zhengang Wu; Zheng Feng; Quanggang Xian
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Paper Abstract

Nano-powders of Si3N4, Si/N/C, SiC, (alpha) -Fe and (gamma) -Fe, 5 - 80 nm in mean diameter were synthesized via laser induced gas phase reactions. Amorphous Si3N4 powders (96 wt%) were obtained at 1000 degree(s)C flow Hexamethyldisilazane + MH3, (beta) -SiC (93 wt%) was formed at 1600 degree(s)C with H2. Amorphous Si/N/C powders with N/C ratios (0.1 - 6) were synthesized at various temperatures. The main impurities in the powders were the organo-ligands such as NHx and CHx (x equals 1 - 3). Pure (gamma) -Fe nano-particle were prepared from cw CO2 laser induced pyrolysis of iron pentacabonyl (gamma) -Fe phase is stable at high temperature. In our method, rapid heating and cooling rate resulted from laser-induced pyrolytic reaction prevent the (gamma) -Fe from transforming to (alpha) -Fe on cooling. Eventually, at room temperature (gamma) -Fe nano particles were prepared with high yield. The (alpha) -Fe and (gamma) -Fe powders were characterized by transmission electron microscope, X-ray diffractometer.

Paper Details

Date Published: 8 September 1999
PDF: 5 pages
Proc. SPIE 3862, 1999 International Conference on Industrial Lasers, (8 September 1999); doi: 10.1117/12.361145
Show Author Affiliations
Yong Liang, Institute of Metal Research (China)
Zhengang Wu, Institute of Metal Research (China)
Zheng Feng, Institute of Metal Research (China)
Quanggang Xian, Institute of Metal Research (China)


Published in SPIE Proceedings Vol. 3862:
1999 International Conference on Industrial Lasers
Fuxi Gan; Horst Weber; Zaiguang Li; Qingming Chen, Editor(s)

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