作　　者： ; ; ; ; ;

机构地区： 西北工业大学材料学院碳碳复合材料工程技术研究中心

出　　处： 《新型炭材料》 2003年第1期20-24,共5页

摘　　要： 　借助三点弯曲试验和扫描电镜观察,对层压结构C C(2D)、三维整体编织结构C C(3D)在高温1700℃及室温下的弯曲力学行为进行了研究,总结了各自性能及损伤破坏的特点。试验结果表明:3DC C以纤维断裂的形式发生弯曲破坏,其弯曲强度、模量均远大于2DC C;对于2DC C,其弯曲破坏模式为基体的层间开裂,材料性能在很大程度上受到炭基体以及界面状态的控制;C C复合材料在高温下弯曲力学性能大幅提高,强度增加幅度高达45%以上,模量增加幅度达15.3%;高温下界面粘结强度增加,导致3DC C的损伤破坏模式有所变化。 The high-temperature flexural properties of two dimensional (2D) C/C laminates and three dimensional (3D) integral braided C/C composites were tested at 1700 degreesC and room temperature by three point bending tests. damage features were analyzed by scanning electron microscopy (SEM). It is concluded that the flexural properties of C/C at elevated temperature are superior to these at room temperature, specifically, the strength increases by more than 45 % and the modulus increases by up to 15.3 %. Moreover, the braided integrity structures applied in 3D C/C improve the stress states, change the fractural patterns of the materials, and therefore result in the superior mechanical properties to those of 2D C/C laminates. Fiber breakage predominates the fracture of 3D C/C composites while delamination and matrix cracks control 2D C/C damage. Finally, the interfaces became stronger at high temperature, leading to the increased flexural strength and modulus as well as the diversified failure mode of 3D C/C. The 3D C/C samples failed from staggered rupture to sudden break as the temperature increased.

关 键 词： 炭 炭复合材料 高温 力学行为 损伤破坏模式 高温材料 纤维增强复合材料

领　　域： [一般工业技术] [化学工程]