球磨-液相氧化短碳纤维增强环氧树脂复合材料的力学性能  

Mechanical Properties of Epoxy Resin Composites Reinforced by Short Carbon Fibers Treated with Ball Milling-liquid Phase Oxidation Method

作　　者：张中威[1] 谭业发[1] 屠义强[1] 董贵杨[1] 杨自双[1] 

机构地区：[1]解放军理工大学野战工程学院,江苏南京210007

出　　处：《兵工学报》2013年第7期869-875,共7页Acta Armamentarii

摘　　要：采用球磨-液相氧化法制备了表面改性的短碳纤维(SCF),选用改性后不同尺寸的短碳纤维增环氧树脂(EP),通过挤出成型法制备短碳纤维/环氧树脂(SCF/EP)复合材料.利用原子力显微镜(AFM)检测和接触角测定等方法研究了改性短碳纤维的表面形貌及其与环氧树脂浸润性能的变化;借助扫描电子显微镜(SEM)观察及拉伸和冲击测试等手段表征SCF/EP复合材料的微观组织和力学性能,分析了其增强机制。结果表明:球磨-液相氧化法改善了纤维与树脂的浸润性能,SCF/EP复合材料拉伸强度和冲击强度最大值分别达到了71.2 MPa和27.75 kJ/m2,比纯环氧树脂提高了103.4%和63.9%.短碳纤维增强SCF/EP复合材料的机制主要有脱粘和拔出机制、裂纹偏转机制和桥联机制。Ball milling-liquid phase oxidation method was adopted to obtain the surface modified short carbon fibers （SCF）. The modified SCFs with different dimensions are used to fabricate the short carbon fiber/epoxy resin composites （SCF/EP） by extrusion process. The surface morphology and wettability of the modified SCFs are characterized by atomic force microscope （AFM） and contact angle measuring method. Scanning electron microscope （SEM） , tensile and impact test characterization are used to study their mierostruetures and mechanical properties. In addition, the reinforcing mechanisms of the short car- bon fibers are elucidated. The results show that the surface wettability of fibers and epoxy is improved u- sing the ball milling-liquid phase oxidation method. The maximum values of tensile and impact strength of SCF/EP are up to 71.2 MPa and 27.75 kJ/m2, respectively, which are increased by 103.4% and 63.9% compared with pure epoxy, respectively. The reinforcing mechanisms involved are mainly fiber debonding and pull-out, crack deflection and fiber bridging.

关 键 词：复合材料 球磨-液相氧化 挤出成型 表面改性 SCF EP复合材料 增强机制 

分 类 号：TB332[一般工业技术—材料科学与工程]