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Effect of α-Alumina as a Seed in Alumina/Silicon Carbide Composites

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Abstract:

Intra-type structure of ceramic matrix composites (CMCs) can improve the mechanical properties of ceramic materials. In this work, we used γ-alumina as a matrix including nano-pore for fabricating alumina/silicon carbide composites using pressure-less sintering and pulse electric current sintering (PECS) techniques. We added α-alumina as a seed in order to improve densification of this commercially available γ-alumina. The mixture was sintered from 1250 to 1450 by pressure-less sintering and PECS techniques. Densification of the specimen sintered by pressure-less sintering is very difficult and bulk density of the specimen sintered at 1450 showed lower than 3.0 g/cc. In the case of the PECS technique, the density was improved to 3.8 g/cc in seed added specimen sintered at 1450. Maximum Vickers hardness and maximum fracture strength were obtained 17 GPa and 500 MPa for the seed added specimens sintered at 1450, respectively.

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Periodical:

Key Engineering Materials (Volumes 317-318)

Pages:

115-118

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.317-318.115

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Online since:

August 2006

Authors:

Seong Min Choi, Uraiwan Leela-adisorn, Sawao Honda, Shinobu Hashimoto, Hideo Awaji

Keywords:

Al2O3/SiC Composite, PECS Technique, Pressure-Less Sintering, α-Al2O3 Seed

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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References

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