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http://dx.doi.org/10.4191/KCERS.2010.47.2.157

Effect of Starting SiC Particle Size on Nitridation and Strength of Silicon Nitride-Bonded Silicon Carbide Ceramics  

Choi, Young-Hoon (Department of Materials Science and Engineering, the University of Seoul)
Kim, Young-Wook (Department of Materials Science and Engineering, the University of Seoul)
Woo, Sang-Kuk (Energy Materials Research Center, Korea Institute of Energy Research)
Han, In-Sub (Energy Materials Research Center, Korea Institute of Energy Research)
Publication Information
Journal of the Korean Ceramic Society / v.47, no.2, 2010 , pp. 157-162 More about this Journal
Abstract
Effect of starting SiC particle size on nitridation rate and flexural strength of $Si_3N_4$-bonded-SiC (SNBSC) ceramics was investigated by using SiC particles of different size (${\sim}200\;{\mu}m$, ${\sim}100\;{\mu}m$ and ${\sim}45\;{\mu}m$). The specimen prepared from smaller SiC particles resulted in higher nitridation rate after nitridation at $1450^{\circ}C$, owing to the lower packing density in green body. The flexural strength showed maxima after 1-h nitridation for all specimens and then decreased with prolonged nitridation because of local densification-induced pore coarsening. The specimen prepared from smaller SiC particles showed better flexural strength because of smaller pore size and partly higher nitridation rate in the specimen. A maximal flexural strength of 29 MPa was obtained in the specimen with a density of $2.04\;g{\cdot}cm^3$, which was prepared from $45\;{\mu}m$-SiC particles.
Keywords
Silicon carbide; Silicon nitride; Silicon nitride-bonded silicon carbide; Nitridation rate; Flexural strength;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
Times Cited By SCOPUS : 4
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