Processing and microstructure of a Ce-doped in situ O′+β′ SiAlON composite

Chao M. Huang; Youren Xu; Avigdor Zangvil; Waltraud M Kriven; Dennis N. Coon

Processing and microstructure of a Ce-doped in situ O′+β′ SiAlON composite

Chao M. Huang, Youren Xu, Avigdor Zangvil, Waltraud M Kriven, Dennis N. Coon

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Abstract

O′+β′ SiAlON mixed-phase composites were successfully fabricated in situ by pressureless sintering with CeO₂ as a sintering aid. The kinetics of densification were studied using Kingery's liquid-phase sintering model. The densification was predominantly achieved by particle rearrangement and solution-reprecipitation. Phase formation started immediately after liquid formation. However, the saturation of phase formation required a prolonged sintering time after completion of densification. Microstructure and microchemical characterization revealed that the O′ phase (Si_2-xAl_xN_2-xO_1+x) had an x value of 0.14, while the β′ phase (Si_6-zAl_zO_zN_8-z) had a z value smaller than 0.8. The O′ phase exhibited rod-like grains of length 20 approximately 30 μm and a mean aspect ratio of 12.5, while the β′ phase contained needle-like grains with lengths smaller than 1 μm.

Original language	English (US)
Pages (from-to)	1128-1137
Number of pages	10
Journal	Ceramic Engineering and Science Proceedings
Volume	15
Issue number	5
State	Published - Sep 1994

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Ceramics and Composites

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title = "Processing and microstructure of a Ce-doped in situ O′+β′ SiAlON composite",

abstract = "O′+β′ SiAlON mixed-phase composites were successfully fabricated in situ by pressureless sintering with CeO2 as a sintering aid. The kinetics of densification were studied using Kingery's liquid-phase sintering model. The densification was predominantly achieved by particle rearrangement and solution-reprecipitation. Phase formation started immediately after liquid formation. However, the saturation of phase formation required a prolonged sintering time after completion of densification. Microstructure and microchemical characterization revealed that the O′ phase (Si2-xAlxN2-xO1+x) had an x value of 0.14, while the β′ phase (Si6-zAlzOzN8-z) had a z value smaller than 0.8. The O′ phase exhibited rod-like grains of length 20 approximately 30 μm and a mean aspect ratio of 12.5, while the β′ phase contained needle-like grains with lengths smaller than 1 μm.",

author = "Huang, {Chao M.} and Youren Xu and Avigdor Zangvil and Kriven, {Waltraud M} and Coon, {Dennis N.}",

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T1 - Processing and microstructure of a Ce-doped in situ O′+β′ SiAlON composite

AU - Huang, Chao M.

AU - Xu, Youren

AU - Zangvil, Avigdor

AU - Kriven, Waltraud M

AU - Coon, Dennis N.

PY - 1994/9

Y1 - 1994/9

N2 - O′+β′ SiAlON mixed-phase composites were successfully fabricated in situ by pressureless sintering with CeO2 as a sintering aid. The kinetics of densification were studied using Kingery's liquid-phase sintering model. The densification was predominantly achieved by particle rearrangement and solution-reprecipitation. Phase formation started immediately after liquid formation. However, the saturation of phase formation required a prolonged sintering time after completion of densification. Microstructure and microchemical characterization revealed that the O′ phase (Si2-xAlxN2-xO1+x) had an x value of 0.14, while the β′ phase (Si6-zAlzOzN8-z) had a z value smaller than 0.8. The O′ phase exhibited rod-like grains of length 20 approximately 30 μm and a mean aspect ratio of 12.5, while the β′ phase contained needle-like grains with lengths smaller than 1 μm.

AB - O′+β′ SiAlON mixed-phase composites were successfully fabricated in situ by pressureless sintering with CeO2 as a sintering aid. The kinetics of densification were studied using Kingery's liquid-phase sintering model. The densification was predominantly achieved by particle rearrangement and solution-reprecipitation. Phase formation started immediately after liquid formation. However, the saturation of phase formation required a prolonged sintering time after completion of densification. Microstructure and microchemical characterization revealed that the O′ phase (Si2-xAlxN2-xO1+x) had an x value of 0.14, while the β′ phase (Si6-zAlzOzN8-z) had a z value smaller than 0.8. The O′ phase exhibited rod-like grains of length 20 approximately 30 μm and a mean aspect ratio of 12.5, while the β′ phase contained needle-like grains with lengths smaller than 1 μm.

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JO - Ceramic Engineering and Science Proceedings

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Processing and microstructure of a Ce-doped in situ O′+β′ SiAlON composite

Abstract

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