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Effect of β–Si3N4 seed crystal on the microstructure and mechanical properties of sintered reaction-bonded silicon nitride

Published online by Cambridge University Press:  26 July 2012

Soo Young Lee ,
K. Amoako-Appiagyei  and
Hai Doo Kim
Soo Young Lee
Affiliation:
Korea Institute of Machinery and Materials, 66 Sangnam-dong, Changwon, Kyungnam, Korea
K. Amoako-Appiagyei
Affiliation:
Korea Institute of Machinery and Materials, 66 Sangnam-dong, Changwon, Kyungnam, Korea
Hai Doo Kim
Affiliation:
Korea Institute of Machinery and Materials, 66 Sangnam-dong, Changwon, Kyungnam, Korea
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Extract

β–Si3N4 seed crystal has been synthesized from α–Si3N4 powder. Reaction-bonded Si3N4/SiC composite has been fabricated with β–Si3N4 seed crystals. The nitridation behavior and the changes in mechanical properties resulting from the addition of seed crystals were studied before and after gas pressure sintering. Addition of seeds showed a considerable improvement in the nitridation, resulting in increase in fracture strength of the composite. Highly nitrided reaction-bonded Si3N4 (RBSN) as a result of the addition of seed crystals gave rise to high strength of composite after postsintering. Fracture toughness of the seeded Si3N4 was also improved up to 35% compared to the baseline Si3N4. Micrographs showed that the seeded Si3N4 developed a bimodal microstructure which resulted in an improvement in fracture toughness.

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Articles
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Journal of Materials Research , Volume 14 , Issue 1 , January 1999 , pp. 178 - 184
Copyright
Copyright © Materials Research Society 1999

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References

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