Abstract

In this work, the effects of fumed-silica functionalization and functionalized fumed-silica content on the three-point bending and sliding wear properties of woven basalt fabric/epoxy composites were investigated. The functionalized fumed-silica particles were evaluated by Fourier-transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The multiscale composites were prepared by impregnating basalt fabrics into epoxy resin incorporated with various functionalized fumed-silica contents (0.5, 1, 3, and 5 wt%). The results of the 3-point bending test showed that a maximum improvement of 50% was gained with the addition of 1 wt% functionalized fumed-silica. Besides, the wear rate and friction coefficient of the basalt fiber/epoxy composite were decreased by 90% and 36%, respectively when 3 wt% functionalized fumed-silica was incorporated. It was also found that the fumed-silica after surface-functionalization improved the flexural properties and wear resistance of basalt fiber/epoxy composite more remarkably than the un-treated fumed-silica. Scanning electron microscope was also utilized to evaluate the fracture and wear mechanisms of the specimens.

摘要

在这项工作中，研究了气相二氧化硅功能化和功能化气相二氧化硅含量对玄武岩织物/环氧树脂复合材料的三点弯曲和滑动磨损性能的影响。通过傅里叶变换红外光谱 (FTIR) 和热重分析 (TGA) 评估功能化的气相二氧化硅颗粒。通过将玄武岩织物浸渍到掺有各种功能化气相二氧化硅含量（0.5、1、3 和 5 重量％）的环氧树脂中来制备多尺度复合材料。三点弯曲试验的结果表明，添加 1 wt% 的功能化气相二氧化硅可最大提高 50%。此外，玄武岩纤维/环氧树脂复合材料的磨损率和摩擦系数分别降低了90%和36%，分别是当掺入 3 wt% 的功能化气相二氧化硅时。还发现表面功能化后的气相二氧化硅比未经处理的气相二氧化硅更显着地提高了玄武岩纤维/环氧树脂复合材料的弯曲性能和耐磨性。还利用扫描电子显微镜来评估试样的断裂和磨损机制。