采用三点弯曲方法测试了压力梯度化学气相浸渗法(CVI)工艺制备的2D炭/炭复合材料的性能,借助于扫描电镜研究了断口和界面形貌,分析了密度和纤维基体界面对材料力学性能的影响.结果表明,随试样密度增加,2D炭/炭复合材料的断裂模式从剪切断裂、层间分离向拉伸断裂转变.材料密度对弯曲强度和模量影响很大,但对弯曲挠度基本没有影响.揭示了影响2D炭/炭复合材料弯曲挠度的关键因素是纤维与热解炭基体界面的结合情况.
The flexural behavior of 2D carbon-carbon (C/C) composites fabricated by CVI was investigated using a three-point bend test, and the fracture surface and interface of the composites were observed by SEM. By analyzing the effects of the fiber-matrix interface and the sample density on the mechanical behavior, it is revealed that the fracture modes of 2D C/C composites change from shearing and delamination failure to tensile breakage with increasing densification degree. The results also show that the density has a great impact on the strength and modulus rather than the flexural deflection. In fact, the flexural deflection of 2D C/C composites depends on the performance of the pyrocarbon and the interfacial bonding between fibers and matrix.
参考文献
| [1] | 韩红梅,张秀莲,李贺军,岳珠峰,李克智.炭/炭复合材料高温力学行为研究[J].新型炭材料,2003(01):20-24. |
| [2] | 李贺军,曾燮榕,李克智.炭/炭复合材料研究应用现状及思考[J].炭素技术,2001(05):24-27. |
| [3] | 李贺军.炭/炭复合材料[J].新型炭材料,2001(02):79-80. |
| [4] | 蒋建纯,黄伯云,熊翔.炭/炭复合材料飞机刹车盘表面加工质量对其磨合性能的影响[J].新型炭材料,2002(02):35-40. |
| [5] | Delhaes P .Chemical vapor deposition and infiltration process of carbon materials[J].Carbon,2002,40(05):641-657. |
| [6] | LI He-jun;HOU Xiang-hui;CHEN Yi-xi .Densification of unidirectional carbon-carbon composites by isothermal chemical vapor infiltrition[J].Carbon,2000,38(03):423-427. |
| [7] | Seh-Min Oh;Jai-Young Lee .Fracture behavior of two-dimensional carbon/carbon composites[J].Carbon,1989,27(03):423-430. |
| [8] | Casal E. .Influence of porosity on the apparent interlaminar shear strength of pitch-based unidirectioal C-C composites[J].Carbon: An International Journal Sponsored by the American Carbon Society,2001(1):73-82. |
| [9] | Tzeng SS;Lin W.-C. -- .Mechanical behavior of two-dimensional carbon/carbon composites with interfacial carbon layers[J].Carbon: An International Journal Sponsored by the American Carbon Society,1999(12):2011-2019. |
| [10] | 孙乐民,李贺军,张守阳.沥青基炭/炭复合材料的弯曲断裂特征[J].新型炭材料,2001(03):28-31,41. |
| [11] | CAI Zhong-long;XIAN Xing-juan.Composites reinforced by super-high modulus polythene fiber[M].北京:科学出版社,1997:89. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%