摘要
采用三点弯曲法测试了单向和三维四向碳纤维增强的两种沥青基碳/碳(C/C)复合材料(1D-C/C和3D-C/C)在室温及1 800℃高温时的弯曲性能,分析了增强体结构、温度对C/C复合材料弯曲性能的影响,并探讨了其弯曲断裂时的界面机制。结果表明:3D-C/C的弯曲模量高于1D-C/C的,但其抗弯强度却明显低于1D-C/C的;1D-C/C的弯曲断裂呈脆性断裂,而3D-C/C的弯曲断裂则表现出明显的假塑性特征;对同一种增强体结构的沥青基C/C复合材料,在1 800℃时的弯曲性能高于其在室温时的。
Flexural properties of unidirectional carbon fiber reinforced pitch-based carbon/carbon （C/C） composites （1D-C/C） and 3D（dimension） ＆ 4D （direction） braided carbon fiber reinforced pitch-based C/C composites （3D-C/C） were tested by three-point bending beams at room temperature and 1 800 ℃ respectively. Effects of reinforcement structures and temperatures on flexural properties of the pitch-based C/C composites were analyzed, and the interface mechanisms in flexural failures was discussed. The results show that the flexural modulus of 3D-C/C was higher than that of 1D-C/C, while the flexural strength of 3D-C/C was lower than that of 1D-C/C obviously. The flexural failure of 1D-C/C was brittle, but that of 3D-C/C was pseudoplastic. Flexural properties of the pitch-based C/C composites at 1 800 ℃ were more excellent than those of the pitch-based C/C composites at room temperature.
出处
《机械工程材料》
CAS
CSCD
北大核心
2009年第8期65-68,共4页
Materials For Mechanical Engineering
