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Effect of sintering additives on the behaviour of SiC whisker-reinforced Si3N4 composites

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Abstract

The effects of sintering additives on the microstructural development, whisker stability, oxidation resistance and room-temperature mechanical properties of the SiC whisker-reinforced Si3N4 matrix composites were investigated. Seven different combinations of Y2O3 and Al2O3 were used as sintering additives. The composites containing 20 vol % SiC whiskers were densified by hot pressing. The microstructure of the resulting composites was characterized using X-ray diffraction, scanning and transmission electron microscopy. Oxidation testing of the composite at 1400 °C was conducted to investigate the relationship between matrix compositions and oxidation resistance. The flexural strength, fracture toughness and crack propagation patterns were also characterized and correlated with the microstructural features.

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Kai, W., Yang, J.M., Shih, C.J. et al. Effect of sintering additives on the behaviour of SiC whisker-reinforced Si3N4 composites. J Mater Sci 27, 3706–3718 (1992). https://doi.org/10.1007/BF00545446

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  • DOI: https://doi.org/10.1007/BF00545446

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