C/C和C/SiC复合材料的夏比冲击性能研究  

Charpy Impact Properties of C/C and C/SiC Composties

作　　者：严科飞[1] 张程煜[1] 乔生儒[1] 韩栋[1] 李玫[1] 

机构地区：[1]西北工业大学超高温结构复合材料国防科技重点实验室,西安710072

出　　处：《航空材料学报》2011年第2期95-98,共4页Journal of Aeronautical Materials

基　　金：国家自然科学基金(50702045);高等学校博士学科点专项科研基金(20070699007);新世纪优秀人才支持计划(NCET-08-0460)

摘　　要：使用夏比摆锤冲击试验机对C/C和C/SiC两种复合材料进行了冲击试验,打击瞬时线速率为2.9 m/s,刀刃半径为2 mm。使用光学显微镜和扫描电子显微镜观察了试样断口形貌。结果表明:C/C和C/SiC两种复合材料的夏比冲击能量随着材料密度的增加而减小,冲击能量与密度基本呈线性关系。密度低的C/C和C/SiC复合材料冲击后的断口参差不齐,有大量纤维束和纤维拔出,夏比冲击韧度较高;高密度试样的宏观断口较为平整,仅有少量的纤维拔出,具有脆性断裂特征。The charpy impact properties of C/C and C/SiC composites were investigated.The specimens were impacted with the knife radius of 2 mm at a linear velocity of 2.9 m/s.The fracture morphologies were examined by Optical Microscope and Scanning Electron Microscope.The results indicate that a linear relationship is present between the impact energy and the density of both composites.The composites with higher density failed at smaller impact energy and their fractured surface are characteristic of few pull-out fibers.Whereas,the fractured surface is rougher for the sample with a lower density,in dicating a large amount of fibers or fiber bundles were pulled out from the matrix.

关 键 词：夏比冲击 冲击能量 密度 

分 类 号：TB332[一般工业技术—材料科学与工程]