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Effect of Diluents on Post-Reaction Sintering of Silicon Nitride Ceramics
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Plastic Deformation of Silicon Nitride Nano-Ceramics
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Synthesis and Microstructural Evaluation of SiC-AlN Composites
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Preparation and Properties of Spark Plasma Sintered AlN/BN Nano-Composites
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Formation and Sintering Mechanisms of Reaction Bonded Silicon Carbide-Boron Carbide Composites
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Plastic Deformation of Silicon Nitride Nano-Ceramics

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Abstract:

A commercial silicon nitride powder with sintering additives was ground by high-energy milling to reduce particle size. Nanometer sized powder was obtained. The powder was densified for short time by spark plasma sintering to prevent grain growth. Nanometer-grained Si3N4 ceramics were obtained. Plastic deformation of the Si3N4 nano-ceramics has been studied in compression over a wide range of strain rates and temperatures. The experimental results revealed that a transition in stress exponent, n, at each temperature. The n value decreased from ~ 2 to ~ 1 with increasing applied stress. Activation energy was also different for the two regions, decreasing from 858.2 kJ/mol in the n ~ 2 region to 571.8 kJ/mol in the n ~ 1 region. Effect of sintering additives on plastic deformation was also discussed.

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Periodical:

Key Engineering Materials (Volume 352)

Pages:

189-192

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.352.189

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Online since:

August 2007

Authors:

Toshiyuki Nishimura, Xin Xu, Naoto Hirosaki, Rong Jun Xie, Hidehiko Tanaka

Keywords:

High Energy Milling (HEM), Plastic Deformation, Spark Plasma Sintering (SPS)

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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