Fabrication of C/C–SiC–ZrB<sub>2</sub> Ultra-High Temperature Composites through Liquid–Solid Chemical Reaction
In this paper, we aimed to improve the oxidation and ablation resistance of carbon fiber-reinforced carbon (CFC) composites at temperatures above 2000 °C. C/C–SiC–ZrB<sub>2</sub> ultra-high temperature ceramic composites were fabricated through a complicated liquid–solid reactive process...
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| Autores principales: | , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/9a45f3d9cbd64b8695516be17c06307c |
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| Sumario: | In this paper, we aimed to improve the oxidation and ablation resistance of carbon fiber-reinforced carbon (CFC) composites at temperatures above 2000 °C. C/C–SiC–ZrB<sub>2</sub> ultra-high temperature ceramic composites were fabricated through a complicated liquid–solid reactive process combining slurry infiltration (SI) and reactive melt infiltration (RMI). A liquid Si–Zr10 eutectic alloy was introduced, at 1600 °C, into porous CFC composites containing two kinds of boride particles (B<sub>4</sub>C and ZrB<sub>2</sub>, respectively) to form a SiC–ZrB<sub>2</sub> matrix. The effects and mechanism of the introduced B<sub>4</sub>C and ZrB<sub>2</sub> particles on the formation reaction and microstructure of the final C/C–SiC–ZrB<sub>2</sub> composites were investigated in detail. It was found that the composite obtained from a C/C–B<sub>4</sub>C preform displayed a porous and loose structure, and the formed SiC–ZrB<sub>2</sub> matrix distributed heterogeneously in the composite due to the asynchronous generation of the SiC and ZrB<sub>2</sub> ceramics. However, the C/C–SiC–ZrB<sub>2</sub> composite, prepared from a C/C–ZrB<sub>2</sub> preform, showed a very dense matrix between the fiber bundles, and elongated plate-like ZrB<sub>2</sub> ceramics appeared in the matrix, which were derived from the dissolution–diffusion–precipitation mechanism of the ZrB<sub>2</sub> clusters. The latter composite exhibited a relatively higher ZrB<sub>2</sub> content (9.51%) and bulk density (2.82 g/cm<sup>3</sup>), along with lower open porosity (3.43%), which endowed this novel composite with good mechanical properties, including pseudo-plastic fracture behavior. |
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