Laser-synthesized silicon- and ferro-based nano powders

Yong Liang; Zhengang Wu; Zheng Feng; Quanggang Xian

doi:10.1117/12.361145

8 September 1999 Laser-synthesized silicon- and ferro-based nano powders

Yong Liang, Zhengang Wu, Zheng Feng, Quanggang Xian

Proceedings Volume 3862, 1999 International Conference on Industrial Lasers; (1999) https://doi.org/10.1117/12.361145
Event: International Symposium on Industrial Lasers, 1999, Wuhan, China

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 NH_x and CH_x (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.

Citation Download Citation

Yong Liang, Zhengang Wu, Zheng Feng, and Quanggang Xian "Laser-synthesized silicon- and ferro-based nano powders", Proc. SPIE 3862, 1999 International Conference on Industrial Lasers, (8 September 1999); https://doi.org/10.1117/12.361145

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