Abstract
Understanding the correlation of C/C preform density and microstructure and properties of the resulting composites is of great importance for the fast and economical fabrication of ultra-high-temperature ceramic matrix composites by reactive melt infiltration. In this paper, C/C-ZrC composites were prepared by eutectic Zr-Si alloyed melt infiltration using different density C/C composite preforms, and the influence of C/C preform densities on the microstructure and mechanical properties of the composites was investigated. The results showed that the densities of the composites decreased with the increase of the C/C preform densities while the open porosities always kept at small values. The C/C-ZrC composites were generally composed of carbon, ZrC phase, and Zr2Si phase. The microstructure and phase composition of the composites were greatly influenced by C/C preform densities. Flexural strength of the composites initially increased with C/C preform densities, and then decreased reversely. The C/C-ZrC composite reached its highest flexural strength, 241 MPa, when the C/C preform density was 1.28 g/cm3. This work revealed the correlation of C/C preform density and microstructure and mechanical properties of C/C-ZrC composites, and will provide a guidance for performance optimization of reactive melt infiltrated ultra-high temperature ceramic matrix composites.
Graphical abstract
The (a): densities and open porosities; (b): XRD patterns; (c): flexural strength of the C/C-ZrC composites prepared by C/C composite preforms with different densities
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Funding
The authors were financially supported by the Natural Science Foundation of China (Nos. 52005053, 11902333, and 51805539) and Natural Science Foundation of Hunan Province of China (Nos. 2019JJ50657 and 2018JJ2426).
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Zhang, H., Liang, X., Hu, Y. et al. Correlation of C/C preform density and microstructure and mechanical properties of C/C-ZrC-based ultra-high-temperature ceramic matrix composites. Adv Compos Hybrid Mater 4, 743–750 (2021). https://doi.org/10.1007/s42114-021-00295-0
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DOI: https://doi.org/10.1007/s42114-021-00295-0