Ablation properties of C/C-UHTCs and their preparation by reactive infiltration of K2MeF6 (Me = Zr,Ti) molten salt |
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| Authors: | Yonglong Xu Wei Sun Chunmao Miao Yuzhu Shen Haikun Chen Yufeng Liu Hongbo Zhang Xiang Xiong |
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| Affiliation: | 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China;2. National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials, Central South University, Changsha, 410083, China;3. Science and Technology on Advanced Functional Composites Laboratory, Aerospace Research Institute of Material and Processing Technology, Beijing, 100089, China |
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| Abstract: | Ultra-high temperature ceramic-modified C/C composites (C/C-UHTCs) were prepared by the reactive infiltration of K2MeF6 (Me = Zr, Ti) mixed with Si and Zr-Si powders. Molten salt infiltration can be divided into two stages: salt ion melt and Me-Si alloy melt. In the temperature range below 1400 °C, Zr and Si dissolve in the molten salt, are carried by the ion melt, and precipitate at the PyC interface to form carbides. Above 1400 °C, a large amount of molten salt volatilises and thermally decomposes. The Me-Si alloy forms a melt and infiltrates the C/C matrix, and finally forms C/C-ZrC-SiC, C/C-Ti3SiC2-SiC, and C/C-ZrC-TiC-SiC composites. The C/C-ZrC-SiC composite with the highest ZrC content exhibited the lowest mass rate (2.6 ± 0.02 mg/s) and linear ablation rate (0.82 ± 0.04 μm/s), which were reduced by 43.5 and 50.8 %, respectively, compared to the unmodified C/C-ZrC-SiC composite. |
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| Keywords: | Reactive molten salt infiltration C/C composites Ultra-high temperature ceramics (UHTCs) |
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