浸渍熔渗复合法制备C<sub>f</sub>/HfC复合材料及其性能

白宏德; 张虹; 叶益聪

doi:10.13801/j.cnki.fhclxb.20151127.003

浸渍熔渗复合法制备C_f/HfC复合材料及其性能

国防科学技术大学航天科学与工程学院, 长沙 410073

基金项目: 国家自然科学基金(51302315)

详细信息

通讯作者:
张虹,副教授,硕士生导师,研究方向为高温结构材料。E-mail:389695459@qq.com

中图分类号: TB332
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出版历程
- 收稿日期: 2015-10-28
- 修回日期: 2015-10-30
- 刊出日期: 2016-06-14

Preparation and property of C_f/HfC composites by liquid impregnation combined reactive melt infiltration

College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China

摘要

摘要: 采用液相浸渍结合反应熔渗法制备了C_f/HfC复合材料。研究了浸渍效果、抗氧化烧蚀微粒分布形貌、熔渗效果与熔渗组织, 并考核了C_f/HfC复合材料的抗氧化烧蚀性能和力学性能。结果表明:经5次浸渍-碳化循环和1次高温处理工艺制备了含13wt%抗氧化烧蚀微粒的ZrB₂+HfO₂+TaSi₂改性C/C预制体, 其密度和开孔率分别为1.41 g/cm³和24.84%, 微粒主要分布在纤维束之间的基体碳中, 且分布均匀。改性C/C预制体经过Hf35Zr10Si5Ta合金反应熔渗制备的C_f/HfC复合材料密度和开孔率分别为2.98 g/cm³和12.95%, 其线烧蚀率为0.017 1 mm/s, 弯曲强度为173.76 MPa, 断裂方式为假塑性断裂。
- 液相浸渍 /
- 反应熔渗 /
- C_f/HfC复合材料 /
- 抗烧蚀 /
- 力学性能
Abstract: The C_f/HfC composite was prepared by liquid impregnation combined reactive melt infiltration technique. The impregnation efficiency, anti-oxidant and anti-ablation particles distribution morphology, infiltration efficiency and infiltration organization were studied, the antioxidant ablation property and mechanical properties of C_f/HfC composites were also assessed. Results show that the modified C/C preform which contains 13wt% ZrB₂+HfO₂+TaSi₂ particles was obtained after five cycles of impregnation-carbonization and one high-temperature treatment process, the density and open porosity of which are 1.41 g/cm³ and 24.84%, respectively. Particles are mainly distributed in matrix carbon between fiber bundles, and the distribution is uniform. The C_f/HfC composites whose density and open porosity are 2.98 g/cm³ and 12.95%, was prepared after Hf35Zr10Si5Ta alloy reactively melt infiltrated modified C/C perform. The linear ablation rate is 0.017 1 mm/s, the flexural strength is 173.76 MPa, and the fracture mechanism is pseudo-ductile fracture.
- liquid impregnation /
- reactive melt infiltration /
- C_f/HfC composites /
- ablation resistance /
- mechanical properties

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