Fabrication, Characterization and Suitability of 3D Non-woven Needle-Punched Preform Cf–SiCm Composites for Ultra-High Temperature Applications

Metallurgical and Materials Transactions A Pub Date : 2024-08-07 DOI:10.1007/s11661-024-07525-2

Samar Mandal, Arjun Mahato, Zafir Alam, Shibayan Roy

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Abstract

In the present study, 3D non-woven needle-punched preform (NPP) C_f–SiC_m composite with 7.5 pct volume fraction of carbon fiber is prepared via liquid silicon infiltration technique and characterized for microstructure, phase formation and mechanical behaviors. Additionally, the composite is subjected to plasma arc jet tests for evaluation of ablation resistance under ultra-high temperature oxidation environment. The dense composite (density ~ 2.5 to 2.6 g/cm³) contains β-SiC phase due to the reaction between infiltrated molten silicon and carbon matrix surrounding the carbon fibers. The resultant C_f–SiC_m composite shows high hardness and high abrasion resistance due to a higher proportion of hard SiC matrix as well as exhibits various toughening mechanisms from the carbon fiber reinforcement causing a delay in fracture. It also contains excellent resistance to thermal shock and thermo-oxidative erosion resistance during plasma arc jet ablation test without any visible crack or damage on the exposed surface.

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用于超高温应用的三维无纺针刺预制棒 Cf-SiCm 复合材料的制作、表征和适用性

本研究通过液态硅渗透技术制备了碳纤维体积分数为 7.5 pct 的三维无纺针刺预成型 (NPP) Cf-SiCm 复合材料，并对其微观结构、相形成和机械性能进行了表征。此外，还对该复合材料进行了等离子弧喷射试验，以评估其在超高温氧化环境下的抗烧蚀性。由于渗入的熔融硅与碳纤维周围的碳基体发生反应，致密的复合材料（密度约为 2.5 至 2.6 g/cm3）中含有 β-SiC 相。由于硬质碳化硅基体所占比例较高，因此生成的 Cf-SiCm 复合材料具有高硬度和高耐磨性，同时碳纤维增强体还具有各种增韧机制，导致断裂延迟。在等离子弧喷射烧蚀试验中，它还具有优异的抗热震性和抗热氧化侵蚀性，暴露表面没有任何可见裂纹或损伤。

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Metallurgical and Materials Transactions A

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