无机材料学报 ›› 2020, Vol. 35 ›› Issue (6): 654-660.DOI: 10.15541/jim20190361

所属专题: 结构陶瓷论文精选(二)

• 研究论文 • 上一篇    下一篇

烧蚀型面结构对CVI+HPIC工艺制备针刺C/C喉衬等离子烧蚀性能的影响

吴小军,杨杰,郑蕊,张兆甫,杨毅   

  1. 西安航天复合材料研究所, 西安 710025
  • 收稿日期:2019-07-17 修回日期:2019-09-18 出版日期:2020-06-20 网络出版日期:2019-10-25
  • 作者简介:吴小军(1978-), 男, 研究员. E-mail: wuxiaojun308@163.com;
    WU Xiaojun (1978-), male, professor. E-mail: wuxiaojun308@163.com
  • 基金资助:
    国家自然科学基金(21676163);中国航天青年拔尖人才项目(2019.1-2021.12)

Effect of Ablation Surface Microstructure on Plasma Arc Ablation Properties of C/C Throat Insert Fabricated via CVI+HPIC Methods

WU Xiaojun,YANG Jie,ZHENG Rui,ZHANG Zhaofu,YANG Yi   

  1. Xi’an Aerospace Composites Research Institute, Xi’an 710025, China
  • Received:2019-07-17 Revised:2019-09-18 Published:2020-06-20 Online:2019-10-25
  • Supported by:
    National Natural Science Foundation of China(21676163);China Aerospace Youth Talent Program(2019.1-2021.12)

摘要:

以碳纤维无纬布/碳纤维网胎叠层针刺预制体为增强体, 经化学气相渗透(CVI)联合沥青高压碳化(HPIC)工艺制备了热解碳+沥青碳双元基针刺C/C喉衬材料, 利用X射线断层扫描(μ-CT)和扫描电镜(SEM)表征了材料的微观结构, 采用等离子烧蚀试验考察了针刺喉衬材料X-Y纤维铺层面(0°)、Z向针刺面(90°)以及两者间过渡层面(23°、45°和68°)的烧蚀性能。结果表明, 采用CVI+HPIC组合工艺能使针刺材料达到高致密态, 获得了孔隙率仅为4%的C/C材料, 材料内部孔隙呈离散态分布, 其中98%的孔隙为小于20 μm的小孔。烧蚀结果显示, 针刺C/C材料不同区域的烧蚀性能存在差异, 从X-Y层面(0°)到Z向针刺面(90°), 其耐烧蚀性能呈先增强后减弱的趋势, 68°层面耐烧蚀性能最好, 线、质量烧蚀率分别为0.056 mm/s、0.050 g/s。烧蚀面纤维的排布是影响烧蚀性能的关键因素, 68°层面因形成的尖端烧蚀模式占比较高, 表现出最佳的耐烧蚀性能。

关键词: 针刺预制体, C/C复合材料, 烧蚀率, 微观结构

Abstract:

The C/C composite was prepared by chemical vaper infiltration (CVI) followed by pitch impregnation and high pressure carbonization (HPIC) using needled non-woven carbon fiber felt preform. The microstructure of composites was characterized by micro-computed tomography (μ-CT) and scanning electron microscope (SEM). The ablation resistance at different cross sections was evaluated using plasma ablation test. Typical cross sections of the experiment were X-Y section (0°, perpendicular to needing direction), Z section (90°, parallel to needing direction) and cross sections (23°, 45°, 68°) of composites, respectively. The results presented that the porosity of the C/C composites was as low as 4%, and 98% of the internal pores was smaller than 20 μm. The ablation resistance at different cross sections improved first and then decreased from X-Y section (0°) to Z section (90°). The cross section at 68° showed the best ablation resistance, at which the mass and linear ablation rates were 0.050 g/s and 0.056 mm/s, respectively. The best ablation resistance is attributed to the icicle-like ablation mode of carbon fiber, which indicates that fiber arrangement at the cross section has significant impact on ablation resistance of C/C composites.

Key words: needled carbon fiber preform, C/C composites, ablation rate, microstructure

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