Ablation behaviour and mechanical performance of ZrB2-ZrC-SiC modified carbon/carbon composites prepared by vacuum filtration combined with reactive melt infiltration
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摘要: 采用真空抽滤ZrB2作为反应熔渗ZrSi2的补充,成功地将ZrB2-ZrC-SiC引入到C/C基体中,使引入的陶瓷相含量增加且分布均匀。与仅通过反应熔渗制备的C/C-ZrC-SiC相比,C/C-ZrB2-ZrC-SiC复合材料的质量烧蚀率和线性烧蚀率分别降低了68.9%和29.7%。烧蚀性能提高的原因在于B2O3的挥发带走部分热量,同时能够形成更多均匀分布的ZrO2,促进ZrO2-SiO2连续保护层的形成,从而有效地抵抗机械剥蚀,阻碍氧气的渗入。
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关键词:
- 碳/碳复合材料 /
- ZrB2-ZrC-SiC /
- 真空抽滤 /
- 反应熔渗 /
- 烧蚀
Abstract: The development of advanced aircrafts relies on high performance thermal-structural materials and composites of carbon/carbon (C/C) with ultrahigh-temperature ceramics are ideal candidates. However, traditional routes of compositing are either inefficient and expensive or lead to non-uniform distribution of ceramics in the matrix. Here, vacuum filtration of ZrB2 was successfully applied to introduce ZrB2-ZrC-SiC into C/C as a supplement for reactive melt infiltration ZrSi2, which contributed to the content increase and uniform distribution of the introduced ceramic phases. The mass and linear ablation rates of the composites were reduced by 68.9% and 29.7%, respectively, compared to those of C/C-ZrC-SiC composites prepared through reactive melt infiltration. The ablation performance was improved because of the volatilization of B2O3, taking a part of the heat away, and more uniformly distributed ZrO2 that could promote the formation of ZrO2-SiO2 continuous protective layer. This efficiently resisted the mechanical denudation and hindered the oxygen infiltration.-
Key words:
- C/C composites /
- ZrB2-ZrC-SiC /
- Vacuum filtration /
- Reactive melt infiltration /
- Ablation.
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Table 1. Density, phase content and porosity of the composites
Sample Density/(g/cm3) Carbon content/% SiC content/% ZrC content/% ZrB2 content/% Porosity/% CSZ 2.66 35.2% 28.3% 36.5% — 10.19% CSZZ 3.06 29.4% 25.5% 32.9% 12.2% 11.68% Table 2. Ablation properties compared with other studies (Abbreviation in the table: chemical vapor infiltration (CVI)
Sample Methods Density/(g/cm3) Porosity/% Linear ablation rate/(μm/s) Mass ablation rate/(mg/s) Ref. C/C-ZrC-ZrB2-SiC CVI+PIP 1.98 13.02 0.50±0.01 2.21±0.60 [37] C/C-ZrC-ZrB2-SiC RMI+SI − − −0.65 0.69 [38] C/C-ZrC-SiC RMI 2.98 23.45 −5.30±0.50 0.70 [39] C/C-SiC-ZrC RMI 2.66 10.19 −1.72 0.61 This work C/C-SiC-ZrB2-ZrC Vacuum filtration+RMI 3.06 11.68 −1.21 0.19 This work -
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