Carbon fibers and composites with epoxy resins:: Topography, fractography and interphases
Carbon fibers and composites with epoxy resins:: Topography, fractography and interphases
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DOI：
10.1016/j.carbon.2003.12.085
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发表时间：
2004-01-01
期刊：
影响因子：
10.9
通讯作者：
Zhandarov, SF
中科院分区：
文献类型：
--
作者：
Gao, SL;Mäder, E;Zhandarov, SF
杂化材料中存在界面相，且对其力学性能有显著影响。为了在微观和宏观力学性能之间找到一座桥梁，本研究从形貌、断口形貌、粘附力和刚度等方面探究了表面/界面相的纳米特性。在此，我们表明，氧化高模量（HM）和中模量（IM）碳纤维表面上粘附力和吸引力的变化似乎是由涂层引起的。涂层对于与两种不同环氧树脂的粘附相互作用至关重要。在200纳米的扫描尺度上，HM纤维的粗糙度明显较高，但表面积比IM纤维小。几十纳米尺度的表面粗糙度对来自“机械联锁”的界面相粘附没有显著贡献。相反，纳米尺度的真实接触面积在界面粘附中起主导作用。通过力体积纳米压痕技术，发现靠近成品纤维表面的树脂区域的刚度不依赖于与纤维表面的距离。我们的观察结果表明，通过微机械测试得到的临界界面能释放率与详细的断口表面特征之间存在能量 - 几何联系。（C）2004爱思唯尔有限公司。保留所有权利。
Interphases exist in hybrid materials and significantly influence their mechanical performance. To find a bridge between the microscopic and macroscopic mechanical properties, this work investigates the nanoscopic nature of surface/interphases in terms of topography, fractography, adhesion and stiffness. Here, we show that variations in both adhesive and attractive forces on oxidized high modulus (HM) and intermediate modulus (IM) carbon fiber surfaces appear to result from the coating layer. The coating layer is critical for adhesive interaction with two different epoxy resins. The HM fiber has the apparently higher roughness but lower surface area than the IM fiber on the scanning scale of 200 nm. The surface roughness on a few tens of nanometer scale has no significant contribution to interphase adhesion from 'mechanical interlocking'. In contrast, the true contact area on the nanometer scale plays a dominant role in interfacial adhesion. Using force volume nano indentation, the stiffness of the resin region near the finished fiber surface was found to not depend on the distance from the fiber surface. Our observations suggest an energy-geometry link between critical interphase energy release rate by micromechanical testing and detailed fracture surface features. (C) 2004 Elsevier Ltd. All rights reserved.