Synthesis and Refinement of β-SiAlON by Nitriding and Post-Sintering of Si Mixture

Abstract:

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A cost-effective route to synthesize β-SiAlONs from Si mixture by reaction bonding followed by post-sintering was investigated. Three different z values, 0.45, 0.92 and 1.87 in Si6-zAlzOzN8-z, without excess liquid phase were selected to elucidate the mechanism of both SiAlON formation and densification. For the RBSN(reaction-bonded silicon nitride) specimens, nitridation rate of more than 90% was achieved by multistep heating up to 1400oC in flowing 5%H2-95%N2 and residual Si was not detected by XRD analysis. Increase in density was observed with z values for the post-sintered specimens and this tendency was well explained by the presence of higher amount of transient liquid phase with larger z values. Measured z values of the synthesized -SiAlONs were nearly similar to calculated values using starting compositions. The slight deviation in the two z values was successfully explained by the reasonable assessment of nitriding and post-sintering process.

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Periodical:

Edited by:

Katsutoshi Komeya, Yi-Bing Cheng, Junichi Tatami and Mamoru Mitomo

Pages:

95-96

DOI:

10.4028/www.scientific.net/KEM.403.95

Citation:

Y. J. Park et al., "Synthesis and Refinement of β-SiAlON by Nitriding and Post-Sintering of Si Mixture ", Key Engineering Materials, Vol. 403, pp. 95-96, 2009

Online since:

December 2008

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$35.00

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