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Properties and Structural Characterization of the Laser Synthesized Nano-Composite Si-N-C Powders

Published online by Cambridge University Press:  15 February 2011

Ya-li Li
Affiliation:
(National Key Lab of RSA, Institute of Metal Research, Academia Sinica, 72 Wenhua Road, Shenyang 110015, P. R. China)
Yong Liang
Affiliation:
(National Key Lab of RSA, Institute of Metal Research, Academia Sinica, 72 Wenhua Road, Shenyang 110015, P. R. China)
Zhuang-qi Hu
Affiliation:
(National Key Lab of RSA, Institute of Metal Research, Academia Sinica, 72 Wenhua Road, Shenyang 110015, P. R. China)
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Abstract

The properties and structure characteristics of the ultrafine Si-N-C powders synthesized from laser induced hexamethyldisilazane and ammonia gas phase reactions were characterized by multiple techniques. Result shows that the Si-N-C particles are uniform in diameter with narrow size distributions and less agglomerated. The powders exhibited a short distance ordered structure which was distorted at high temperature annealing. HTEM observation shows that the particles are amorphous or have nano-composite structure with SiC particles dispersed in the amorphous Si-N-C matrix. The nucleation and growth of the composite particles occurred by the polymerization of the ligand formed from the decomposition of Si-CH3 and N-H bonds in hexamethyldisilazane accompanied by the release of small hydrocarbon gases.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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