预炭层对ZrC浸渍C/C复合材料微观结构和力学性能的影响

李贺军; 陶珺; 姚栋嘉; 付前刚; 李克智

预炭层对ZrC浸渍C/C复合材料微观结构和力学性能的影响

西北工业大学超高温复合材料重点实验室 C/C复合材料工程技术研究中心, 陕西西安 710072

基金项目: 国家自然科学基金(51221001);国防基础科研计划(A2720110008);"111"计划(08040).

详细信息

作者简介:
李贺军,教授.E-mail:lihejun@nwpu.edu.cn

中图分类号: TQ342⁺.74
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- 被引次数: 0
出版历程
- 收稿日期: 2015-01-02
- 录用日期: 2015-09-07
- 修回日期: 2015-06-30
- 刊出日期: 2015-08-28

Influence of a pre-coated pyrocarbon layer on the microstructure and mechanical properties of ZrC-doped C/C composites

Key Laboratory of Thermostructure Composite Materials, C/C Composites Technology Research Center, Northwestern Polytechnical University, Xi'an 710072, China

Funds: National Natural Science Foundation of China (51221001); Defense Idustrial Technology Development Program(A2720110008); “111”Project (08040).

摘要

摘要: 采用化学气相浸渗法在炭纤维表面制备出不同厚度的预炭层,以ZrOCl₂溶液浸渍法将锆化物引入含预炭层的预制体中,经热处理、致密化和石墨化等工艺处理,制备出一种含预炭层的ZrC-C/C复合材料。借助X射线衍射仪、扫描电镜以及能谱等手段,对材料的微观结构进行表征,采用三点弯曲实验研究材料的力学性能,并探讨预炭层厚度对材料微观结构及其力学性能的影响。结果表明,当预炭层厚度为1.5-1.7μm时,复合材料的平均抗弯强度可达256.85MPa,与不含预炭层试样相比,增加了67.01%;抗弯试样表现出脆性断裂模式;材料的抗烧蚀性能略有提高。
- 预炭层 /
- ZrC /
- C/C复合材料 /
- 力学性能
Abstract: A carbon fiber preform was pre-coated with a carbon layer (PyC) with different thicknesses by chemical vapor infiltration (CVI), then impregnated with a ZrOCl₂ ethanol solution, carbonized at 1 800 ℃ to form ZrC, densified by CVI to a density of 1.75 g/cm³ and graphitized at 2 300 ℃ to obtain ZrC-doped C/C composites. The microstructure and composition of the composites were analyzed by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The mechanical properties were studied by three-point bend tests. The influence of the PyC layer on the microstructure, ZrC distribution and mechanical properties was investigated. Results show that the average flexural strength is 256.85 MPa when the thickness of PyC layer is 1.5-1.7 μm, which is a 67.01% increase compared with the sample without the PyC layer. The cross sections of the composites after flexural failure show a brittle-fracture mode. The ablation resistance of the composites was slightly improved as a result of the PyC layer.
- Pre-coated carbon layer /
- ZrC /
- C/C composites /
- Mechanical properties

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