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Microstructure and Mechanical Properties of SiC/zirconia-toughened Mullite Nanocomposites Prepared from Mixtures of Mullite Gel, 2Y-TZP, and SiC Nanopowders

Published online by Cambridge University Press:  31 January 2011

X. H. Jin ,
L. Gao ,
L. H. Gui  and
J. K. Guo
X. H. Jin
Affiliation:
The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, 1295 Dingxi road, Shanghai 200050, People's Republic of China
L. Gao*
Affiliation:
The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, 1295 Dingxi road, Shanghai 200050, People's Republic of China
L. H. Gui
Affiliation:
The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, 1295 Dingxi road, Shanghai 200050, People's Republic of China
J. K. Guo
Affiliation:
The State Key Laboratory of High Performance Ceramics and Superfine Microstructure, 1295 Dingxi road, Shanghai 200050, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Extract

SiC/ZTM (zirconia-toughened mullite) nanocomposites were prepared by hot pressing mixtures of mullite gel, 2Y-TZP, and SiC nanopowders. The intimate mixing of Al2O3 and SiO2 components in the starting powder prevented intermediate ZrSiO4 phase formation during sintering. Addition of nano-sized SiC significantly retarded the matrix grain growth, making the microstructure much finer and more uniform. Transmission electron microscopy and high-resolution transmission electron microscopy revealed that many SiC nanoparticles were found in mullite and ZrO2 grains, and low-energy grain boundaries and mullite–liquid interfaces parallel to the {110} planes of rodlike mullite grains were formed. It is deduced that the formation of rodlike mullite grains is the result of the preferential development of these low-energy grain boundaries and mullite–liquid interfaces. The mechanical properties of the SiC/ZTM nanocomposite showed significant improvement over those of ZTM, and further enhancement in the mechanical properties was achieved by combinative strengthening with nano- and micro-sized SiC.

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Articles
Information
Journal of Materials Research , Volume 17 , Issue 5 , May 2002 , pp. 1024 - 1029
Copyright
Copyright © Materials Research Society 2002

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