Nanosized Si/C/N composite powders formed by laser-aerosol coupling
| Autor: | E. Musset, O. Croix, M. Cauchetier, N. Herlin, Michel Luce |
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| Rok vydání: | 1993 |
| Předmět: |
Materials science
Argon Energy conversion efficiency Composite number Analytical chemistry General Physics and Astronomy Mineralogy chemistry.chemical_element Laser Amorphous solid law.invention chemistry law [PHYS.HIST]Physics [physics]/Physics archives Atomic ratio Irradiation Chemical composition |
| Zdroj: | Journal de Physique IV Proceedings Journal de Physique IV Proceedings, EDP Sciences, 1993, 03 (C7), pp.C7-1481-C7-1484. ⟨10.1051/jp4:19937232⟩ |
| ISSN: | 1155-4339 1764-7177 |
| Popis: | Recently it has been shown that ultrafine preceramic Si/C/N powders in the nanometric range can be obtained by combining the ultrasonic injection of a liquid precursor with the CO 2 laser irradiation. At the CEA the first experiments were conducted with hexamethyldisilazane-(CH 3 ) 3 SiNHSi(CH 3 ) 3 - (or HMDS) as the precursor. The aerosol droplets formed by the Pyrosol process are carried out with a flow of argon or argon ammonia mixture into the beam of a high powered industrial continuous wave CO 2 laser. At laboratory scale up to 100cm 3 /hr of liquid are displaced with a conversion efficiency (liquid→powder) of about 45%. The chemical composition is controlled by varying the synthesis conditions. The C/N atomic ratio changes from 3 (under argon) to 0.35 (under argon+ammonia). The as-formed powders are amorphous, monodispersed and nanosized ( |
| Databáze: | OpenAIRE |
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