Abstract
In this work, a structural–functional integrated SiCw/Si3N4 composite with high mechanical and microwave (MW) absorption properties was prepared by hot pressing at 1800 °C. By adding the amount of 20 wt% SiC whiskers (SiCw), the SiCw/Si3N4 composite achieved excellent relative density (98.6%) and mechanical properties, i.e., bending strength (938.6 ± 40.7 MPa), fracture toughness (9.40 ± 0.72 MPa m1/2), hardness (20.5 ± 0.8 GPa) and Young’s modulus (216.3 ± 21.7 GPa). Additionally, the SiCw/Si3N4 composite exhibits an effective absorption bandwidth of 2.74 GHz at 1.6 mm thickness. The improved mechanical properties were mainly attributed to crack deflection and pullout of SiCw and Si3N4 grains. Meanwhile, the improved MW absorbing properties of the material were due to the dielectric loss of the SiC phase and good impedance matching. Overall, the SiCw/Si3N4 composite presented in this study demonstrates the potential for the preparation of structural and functional integrated ceramics.
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The data used to support the findings of this study are available from the corresponding author upon request.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (51572145), Natural Science Foundation of Shandong Province (ZR2020LFG007), and Natural Science Foundation of Shandong Province (ZR2019PEM012). Additionally, the authors would like to acknowledge the technical support from Shandong University Testing and Manufacturing Center for Advanced Materials.
Funding
This work was supported by the National Natural Science Foundation of China (51572145), Natural Science Foundation of Shandong Province (ZR2020LFG007), and Natural Science Foundation of Shandong Province (ZR2019PEM012).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by JJ, YZ and JL. The first draft of the manuscript was written by JJ and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Jing, J., Zhao, Y., Saleam, A. et al. High mechanical properties and microwave absorption performances of SiCw/Si3N4 ceramic composites. J Mater Sci: Mater Electron 34, 1384 (2023). https://doi.org/10.1007/s10854-023-10771-6
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DOI: https://doi.org/10.1007/s10854-023-10771-6