Fe基高温合金涂层封填C/C-ZrC-SiC复合材料的制备及抗烧蚀机制

田甜; 孙威; 熊翔; 徐永龙; 湛紫章; 陈招科

doi:10.13801/j.cnki.fhclxb.20181112.002

Fe基高温合金涂层封填C/C-ZrC-SiC复合材料的制备及抗烧蚀机制

中南大学粉末冶金研究院, 长沙 410083

基金项目: 国家自然科学基金（51405522）

详细信息

通讯作者:
孙威,博士,副研究员,博士生导师,研究方向为高性能碳基复合材料E-mail:sunweimse@csu.edu.cn

中图分类号: TB332
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出版历程
- 收稿日期: 2018-06-25
- 刊出日期: 2019-07-14

Preparation and ablative mechanism of C/C-ZrC-SiC composites filled with Fe-based superalloy coating

Powder Metallurgy Institute, Central South University, Changsha 410083, China

摘要

摘要: 为了改善C/C-ZrC-SiC复合材料在高超声速飞行器热防护领域的使用性能，采用低压悬浮浸渗法制备出Fe基高温合金涂层封填C/C-ZrC-SiC复合材料。利用XRD、SEM、EDS等手段研究氧乙炔焰烧蚀前后Fe基高温合金涂层封填C/C-ZrC-SiC复合材料表层微观结构演变规律，阐明了Fe基高温合金涂层对C/C-ZrC-SiC复合材料烧蚀行为的影响。结果表明：C/C-ZrC-SiC复合材料在1 650℃的大气环境下并通过低压悬浮浸渗法浸渗2 h后，其表层形成一层均匀、致密、且结合紧密的Fe基高温合金涂层。在2 500℃下烧蚀180 s后，改性后的C/C-ZrC-SiC复合材料表面出现较小的烧蚀坑，质量烧蚀率相比未表面改性的试样降低了8%，线烧蚀率降低了35%。且表面生成一层均匀致密的Fe₂O₃-ZrO₂复合氧化物保护层，大大降低了表面裂纹、孔洞等缺陷的产生，从而降低了氧的扩散速率及缺陷带来的应力集中。最终Fe基高温合金覆盖层提高了C/C-ZrC-SiC复合材料的高温抗氧化性和抗机械剥蚀性能。
- C/C-ZrC-SiC复合材料 /
- Fe基高温合金涂层 /
- 低压悬浮浸渗 /
- 烧蚀 /
- 复合氧化物
Abstract: The C/C-ZrC-SiC composites filled with Fe-based superalloy coating were prepared by low pressure suspension impregnation to improve the C/C-ZrC-SiC composites used in the field of hypersonic flight vehicle's thermal protective performance. The evolution rule of the surface microstructure of the C/C-ZrC-SiC composites filled with Fe-based superalloy before and after oxy-acetylene flame ablation was studied by means of XRD, SEM and EDS. And the effect of the Fe-based superalloy coating on the ablation behavior of the C/C-ZrC-SiC composites was clarified. The results show that the C/C-ZrC-SiC composites are infiltrated by low pressure suspension infiltration at 1 650℃ for 2 h, and a uniform, dense and tightly bonded Fe-based superalloy coating is formed on the surface. After the ablation at 2 500℃ for 180 s, the surface of the modified the C/C-ZrC-SiC composites generates a smaller ablation pit, and the mass and linear ablation rate are reduced by 8% and 35% respectively than the unmodified sample. And a uniform and dense protective layer of the Fe₂O₃-ZrO₂ composite oxides is formed on the surface, which greatly reduces the occurrence of surface cracks, holes and other defects, thereby reducing the diffusion rate of oxygen and the stress concentration caused by defects. The Fe-based superalloy coating improves the high temperature oxidation resistance and mechanical corrosion resistance of the C/C-ZrC-SiC composites.
- C/C-ZrC-SiC composites /
- Fe-based superalloy coating /
- low pressure suspension impregnation /
- ablation /
- composite oxides