3D C/SiC复合材料的力学性能  

Mechanical properties of three-dimensional braided C/SiC composites

作　　者：肖鹏[1] 谢建伟[1] 熊翔[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2008年第4期718-722,共5页Journal of Central South University:Science and Technology

基　　金：国家高新技术研究发展计划资助项目(2006AA03Z560)

摘　　要：对三维四向编织结构炭纤维增强碳化硅基复合材料的弯曲、断裂韧性和拉伸性能进行研究,利用扫描电镜(SEM)观察材料的断口形貌,获得该材料主要的力学性能及破坏规律。研究结果表明:三维C/SiC复合材料具有较高的弯曲强度和断裂韧性,最高值分别为465MPa和15.1MPa·m1/2;界面结合适中的材料纤维与纤维束被大量拔出,表现出较好的假塑性断裂特征;材料的拉伸强度最高达到168MPa;材料在拉伸过程中,其纤维束在外力作用下向受力的轴向靠拢,纤维束间的夹角减少,材料总应变增加。The bending, fracture toughness and tensile experiments of 4-steps three dimensional（3D） carbon fiber reinforced silicon carbide composites were studied, and fracture micrograph was observed by SEM. Their principal mechanical properties and fracture mechanism were obtained. The results show that 3D braided C/SiC composites have good flexural strength and fracture toughness, and the maximum of which are 465 MPa and 15.1 MPa·m^1/2, respectively. Fibers and fiber bundles are pulled out largely in composites with proper interface, and composites show good pseudo plastic behavior. The maximal tensile strength of composites is up to 168 MPa. In the process of stretching experiments, fiber bundles are closed to direction of axes enduring outside force, with the decrease of angle of fiber bundles and the increase of total strain of composites.

关 键 词：三维编织 C/SIC复合材料 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]