碳纤维上原位生长碳纳米管对C/C复合材料弯曲性能的影响  

Influence of in-situ grown carbon nanotubes on carbon fiber on the flexural properties of C/C composites

作　　者：文诗琦 李克智[1] 宋强[1] 

机构地区：[1]西北工业大学材料科学与工程学院,凝固技术国家重点实验室,西安710072

出　　处：《复合材料学报》2013年第6期7-13,共7页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(50832004);西北工业大学凝固技术国家重点实验室科研基金(25-TZ-2009)

摘　　要：以碳毡为基底原位生长了碳纳米管(CNTs),借助化学气相渗透制备了CNTs-C/C复合材料。研究了催化剂含量对碳纳米管生长的影响以及不同含量碳纳米管对C/C复合材料弯曲性能的影响。结果表明:催化剂对CNTs产量影响较大,且含量越多,生成的CNTs量越大;原位生长CNTs引入的催化剂会导致CNTs-C/C复合材料弯曲性能变差;CNTs的加入改变了热解碳的沉积行为,诱导了球状和锥状小尺寸热解碳的形成,减少了微裂纹的出现。适量CNTs能提高C/C复合材料的弯曲强度和模量,并改善材料的断裂行为。The carbon nanotubes （CNTs） were in-situ grown on carbon fiber felts and the hybrid felts were densified by chemical vapor infiltration （CVI） to prepare CNTs-C/C composites.The effects of catalyst content on the growth of CNTs and the effects of CNT content on the flexural properties of CNTs-C/C composites were investigated. The results show that catalyst content has a great influence on the yield of CNTs. More CNTs were obtained with the catalyst content increasing. The catalysts used for CNT growing deteriorate the flexural properties of C/C composites. The CNTs changes the infiltration behaviors of pyrocarbons and induces the formation of abundant small-sized spherical or cone-shaped pyrocarbons, which inhibits the formation of annular cracks in pyrocarbon matrix. The CNTs with a suitable content can increase the flexural strength and modulus and improve the fracture behavior of C/C composites.

关 键 词：碳纳米管 碳 碳复合材料 原位生长 弯曲性能 微观结构 

分 类 号：TB332[一般工业技术—材料科学与工程]