Abstract
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 CO2 laser irradiation. At the CEA the first experiments were conducted with hexamethyldisilazane - (CH3)3SiNHSi(CH3)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 CO2 laser. At laboratory scale up to 100cm3/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 and nanosized (<100nm). The effect of heating under nitrogen atmosphere has been studied by various diagnostics (chemical analysis, BET, XRD).
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References
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© 1994 Springer Science+Business Media Dordrecht
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Herlin, N., Croix, O., Cauchetier, M., Luce, M., Musset, E. (1994). Nanometric Si/C/N Composite Powders Formed by Aerosol — Laser Interaction. In: Hadjipanayis, G.C., Siegel, R.W. (eds) Nanophase Materials. NATO ASI Series, vol 260. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1076-1_16
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DOI: https://doi.org/10.1007/978-94-011-1076-1_16
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