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Sintering behavior and properties of SiC/Si3N4 composite

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Abstract

SiC/Si3N4 composite was pressureless sintered using self-propagating high-temperature combustion synthesis α-Si3N4 powder and appropriate amount of β-SiC powder. Both of the sintering additive systems were used, which were YAN (Y2O3–Al2O3–AlN) and YN (Y2O3–AlN). The influences of β-SiC content on sintering behavior of SiC/Si3N4 composite were investigated. The results show that the density, shrinkage, bending strength, hardness, and fracture toughness of the samples with two sintering additive systems increase first with the increase of the contents of β-SiC and then decrease even when β-SiC contents continually increase. The tendency of weight loss of the samples is opposite. The β-SiC content of the samples with the best mechanical properties is different in two systems. For YAN system, the best mechanical properties of the samples are gained when β-SiC content reaches 10 %, while as for YN system it is 5 %. The properties of YN samples are superior to YAN samples. J phase (2Y2O3·Si2N2O) forms in YN system easily. A small amount of M phase (Y2O3·Si3N4) is observed in YAN system.

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Acknowledgments

The present research was financially supported by the National Natural Science Foundation of China (No. 51362001) and the Key Projects of Beifang University of Nationalities, China. (No. 2012XZK02).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beifang University of Nationalities, Yinchuan, 750021, China

    Yong Jiang, Lan-Er Wu & Wen-Zhou Sun

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  1. Yong Jiang
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  2. Lan-Er Wu
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  3. Wen-Zhou Sun
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Correspondence to Yong Jiang.

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Jiang, Y., Wu, LE. & Sun, WZ. Sintering behavior and properties of SiC/Si3N4 composite. Rare Met. 34, 95–100 (2015). https://doi.org/10.1007/s12598-013-0187-x

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  • DOI: https://doi.org/10.1007/s12598-013-0187-x

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