Abstract
The SiC/Al4SiC4 composites with the improved mechanical properties and thermal conductivity were fabricated by the in-situ reaction of polycarbosilane (PCS) and Al powders using spark plasma sintering. The addition of 5 wt% yttrium (Y) sintering additive was useful to obtain fully dense samples after sintering at a relatively low temperature of 1650 °C, due to the formation of a liquid phase during sintering. The average particle size of the in-situ formed SiC was ~300 nm. The fracture toughness (4.9 MP·m1/2), Vickers hardness (16.3 GPa), and thermal conductivity (15.8 W/(m·K)) of the SiC/Al4SiC4 composite sintered at 1650 °C were significantly higher than the hardness (13.2 GPa), fracture toughness (2.16 MPa·m1/2), and thermal conductivity (7.8 W/(m·K)) of the monolithic Al4SiC4 ceramics. The improved mechanical and thermal properties of the composites were attributed to the high density, fine grain size, as well as the optimized grain boundary structure of the SiC/Al4SiC4 composites.
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (Grant Nos. 11975296 and 51811540402), and the Natural Science Foundation of Ningbo City (Grant No. 2018A610001). This work was also supported by the Slovak Research and Development Agency under the contract No. APVV-SK-CN-2017-0040. Peter TATARKO gratefully acknowledges the financial support of the project APVV-17-0328.
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Liu, J., Zhou, X., Tatarko, P. et al. Fabrication, microstructure, and properties of SiC/Al4SiC4 multiphase ceramics via an in-situ formed liquid phase sintering. J Adv Ceram 9, 193–203 (2020). https://doi.org/10.1007/s40145-020-0359-8
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DOI: https://doi.org/10.1007/s40145-020-0359-8