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J. Korean Ceram. Soc. > Volume 40(9); 2003 > Article
Journal of the Korean Ceramic Society 2003;40(9): 832.
doi: https://doi.org/10.4191/kcers.2003.40.9.832
Effect of Silicon Nitride Whisker Content on the Flexural Strength of Silicon Nitride-Boron Nitride-Silicon Carbide Multi-Layer Composites
Dong-Soo Park, Byung-Wook Cho
Ceramic Materials Group, Korea Institute of Machinery and Materials
Multi-layer ceramic composites were prepared by tape casting followed by hot pressing using silicon nitride layer with silicon nitride whiskers, silicon nitride layer with silicon carbide particles and boron nitride-alumina layer. The whiskers were aligned during the casting. As the whisker content of the silicon nitride layer was increased up to 10 wt%, the flexural strength of the multi-layer composite was increased. However, further increase of the whisker content in the layer resulted in a rapid decrease of the strength of the composite. The results suggest that the strength of multi-layer ceramic composite showing non-catastrophic failure behavior can be significantly improved by incorporating the aligned whiskers in the layers.
Key words: ${\beta}$-silicon nitride whiskers, Alignment, Silicon nitride-boron nitride-silicon carbide, Multilayer composites, Flexural strength, Non-catastrophic failure
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