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Laser synthesis and crystallization of nanocomposite Si/C/N powder

Published online by Cambridge University Press:  31 January 2011

Zhengwei Pan ,
Hualun Li  and
Litong Zhang
Zhengwei Pan
Affiliation:
State Key Laboratory of Solidification Processing, Department of Materials Science & Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, People's Republic of China
Hualun Li
Affiliation:
State Key Laboratory of Solidification Processing, Department of Materials Science & Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, People's Republic of China
Litong Zhang
Affiliation:
State Key Laboratory of Solidification Processing, Department of Materials Science & Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, People's Republic of China
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Extract

Ultrafine preceramic Si/C/N composite powders have been prepared from hexamethyldisilazane (HMDS) by laser-induced gas phase reaction, using a new kind of tworeaction-zone reactor which could efficiently increase laser efficiency and production yield compared with a one-reaction-zone reactor. The as-formed products were nanosized (50–80 nm), amorphous powders containing Si–C and Si–N bonds homogeneously mixed with some excess carbon. The production yield was in the range of 88–120 g/h. Changes of chemical composition and crystallization of the powders during heat treatment at 1350 and 1550 °C under nitrogen for 1 h were studied.

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Articles
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Journal of Materials Research , Volume 13 , Issue 7 , July 1998 , pp. 1996 - 2002
Copyright
Copyright © Materials Research Society 1998

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