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Preparation and Characterization of (Mo, W)Si2-SiC Composites by In Situ Microwave Reaction Sintering

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Abstract

MoSi2-based materials are considered potentially useful for making high-temperature structural parts. In this work, (Mo, W)Si2-SiC composites have been successfully prepared in situ by microwave reaction sintering of the elemental reactants. Benefiting from the lower sintering temperature and faster densification procedure, the as-prepared composites have finer microstructures compared to the analogs prepared by conventional reaction sintering, resulting in a significant improvement of mechanical properties. The flexural strength, Vickers hardness and fracture toughness of 10%SiC/10%WSi2/80%MoSi2 are as high as 302.81 MPa, 8.55 GPa and 8.90 MPa m1/2, respectively, which are also better than those of monolithic MoSi2 and 10%SiC/90%MoSi2 composite due to the synergistic strengthening and toughening effects of W alloying and SiC second phase.

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Acknowledgments

The project was supported by the Natural Science Foundation of Hunan Province (13JJ4081) and Research fund of Yancheng Institute of Technology (KJC2013006).

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Authors and Affiliations

  1. Department of Mechanical and Energy Engineering, Shaoyang University, Shaoyang, 422000, People’s Republic of China

    Haijiang Wu

  2. School of Physics and Electronic Science, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, People’s Republic of China

    Fang Chen

  3. School of Materials Engineering, Yancheng Institute of Technology, Yancheng, 224051, Jiangsu, People’s Republic of China

    Jianguang Xu

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  1. Haijiang Wu
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  2. Fang Chen
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Correspondence to Jianguang Xu.

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Wu, H., Chen, F. & Xu, J. Preparation and Characterization of (Mo, W)Si2-SiC Composites by In Situ Microwave Reaction Sintering. J. of Materi Eng and Perform 26, 3239–3244 (2017). https://doi.org/10.1007/s11665-017-2775-7

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  • DOI: https://doi.org/10.1007/s11665-017-2775-7

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