功能化纳米SiO 2 改性环氧树脂复合材料及其摩擦磨损行为与机制
摘要
Nano-SiO<sub>2</sub> surface grafted APTES (T-SiO<sub>2</sub>) was realized by covalent functionalization technology, and functionalized nano-SiO<sub>2</sub> modified epoxy resin composite (T-SiO<sub>2</sub>/EP) was prepared. The surface functional groups and chemical elements of the functionalized nano-SiO<sub>2</sub>were analyzed and the mechanical and tribological properties of the T-SiO<sub>2</sub>/EP were tested. The results show that the mechanical and tribological properties of the epoxy resin are effectively improved due to the introduction of functionalized nano-SiO<sub>2</sub>. When the content of functionalized nano-SiO<sub>2</sub> is 2%(mass fraction, same as below), the microhardness and fracture toughness of the composites (2%T-SiO<sub>2</sub>/EP) can reach the maximum, which are 70.2HD and 1.02MPa·m<sup>1/2</sup> respectively, moreover, in dry friction condition, the friction coefficient and the wear loss reach the minimum, which are 0.49mg and 1.7mg respectively. Compared with pure epoxy resin, they are reduced by 31.9% and 34.6%, and compared with 2% unmodified nano-SiO<sub>2</sub> reinforced epoxy resin composite, they are reduced by 14% and 10.5%,and the corresponding wear mechanism is analyzed.