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Microstructural evolution and mechanical properties of Si3N4–SiC (nanoparticle)–Si3N4 (whisker) composites

Published online by Cambridge University Press:  31 January 2011

Young-Hag Koh ,
Hae-Won Kim  and
Hyoun-Ee Kim
Young-Hag Koh
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Korea
Hae-Won Kim
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Korea
Hyoun-Ee Kim
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Korea
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Abstract

The effects of SiC-nanoparticle and Si3N4-whisker additions on the microstructural evolution and mechanical properties of Si3N4 were investigated. The addition of SiC nanoparticles suppressed Si3N4 grain growth, leading to an improvement in the flexural strength. On the other hand, Si3N4 whiskers in the specimen promoted the formation of large elongated grains, which were found to be beneficial to the fracture toughness of the material. When both SiC nanoparticles and Si3N4 whiskers were added concurrently, large grains were formed in fine matrix grains. The microstructure of Si3N4 was controlled by adjusting the relative concentrations of SiC nanoparticles and the Si3N4 whiskers added. These compositional and microstructural variations of the Si3N4 had significant influence on the mechanical properties, such as strength, fracture toughness, R-curve behavior, and high-temperature strength.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 2 , February 2000 , pp. 364 - 368
Copyright
Copyright © Materials Research Society 2000

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References

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