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TEM Studies of Silicon Nitride-Silicon Carbide Nanocomposites

Published online by Cambridge University Press:  02 July 2020

E. Y. Wang ,
X. Pan ,
J. P. Mansfield ,
T. Kennedy  and
S. Hampshire
E. Y. Wang
Affiliation:
Department of Mat. Sei. & Eng., University of Michigan, Ann Arbor, MI48109
X. Pan
Affiliation:
Department of Mat. Sei. & Eng., University of Michigan, Ann Arbor, MI48109
J. P. Mansfield
Affiliation:
Department of Mat. Sei. & Eng., University of Michigan, Ann Arbor, MI48109
T. Kennedy
Affiliation:
Ceramics Research Unit, University of Limerick, Ireland
S. Hampshire
Affiliation:
Ceramics Research Unit, University of Limerick, Ireland
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Extract

Si3N4/SiC nanocomposites have been shown to exhibit excellent strength and fracture toughness compared to monolithic Si3N4 materials. Recently, the microstructure and chemistry of Si3N4-based nanocomposites fabricated by hot-pressing amorphous Si-C-N precursor powders has been investigated. In the present work, our studies on the microstructure of Si3N4/SiC nanocomposites made by hot-pressing the mixture of Si3N4 and SiC commercial powders are reported.

Si3N4/SiC nanocomposites were prepared by hot-pressing at 1750 °C for 1 hour at 40 Mpa in a nitrogen atmosphere, with sintering aids of 5.5 wt% Y2O3 and 3 wt% Al2O3. The details of the processing procedure have been reported elsewhere. Two different materials were investigated in this work: specimen A consisting of 5 vol% β-SiC; and specimen B consisting of 5 vol% α-SiC. TEM specimens were prepared by conventional procedures. The microstructure and chemical composition were studied in the University of Michigan Electron Microbeam Analysis Laboratory on a JEOL 2000FX.

Type
Nanocrystals and Nanocomposites: Novel Structures For Catalysis, Electronics, and Micromechanics
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 411 - 412
Copyright
Copyright © Microscopy Society of America 1997

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References

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