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J. Korean Ceram. Soc. > Volume 39(8); 2002 > Article
Journal of the Korean Ceramic Society 2002;39(8): 715.
doi: https://doi.org/10.4191/kcers.2002.39.8.715
Effect of the Amount of the Sintering Additives on the Microstructural Development and the Mechanical Properties of Silicon Nitride with Aligned Whisker Seeds
Byoung-Chan Bae, Dong-Soo Park1, Hai-Doo Kim1, Byung-Dong Han1, Chan Park, Lin-Hua Zou2
Department of Materials Science and Engineering , Pukyong National University
1Ceramic Materials Group, Korea Institute of Machinery and Materials
2Department of MSE, Tsinghua University
Silicon nitride samples with aligned whisker seeds were prepared with different amounts of yttria and alumina as the sintering additives. Their sintering behaviors and the microstructural developments between 2123K and 2323K were examined. The sample with larger amount of the sintering additives showed faster densification and grain growth. Even though addition of the aligned whisker seeds slightly retarded densification of silicon nitride, it improved the flexural strength and the fracture toughness. Both the flexural strength and the fracture toughness of silicon nitride with the aligned whisker seeds were increased as the amount of the sintering additives was increased.
Key words: Silicon nitride, Sintering additives, Microstructural development, Mechanical properties
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