摘要
运用共价官能化技术,实现纳米SiO2表面接枝3-氨丙基三乙氧基硅烷(APTES)改性(T-SiO2),并制备功能化纳米SiO2改性环氧树脂复合材料(T-SiO2/EP),分析改性后纳米SiO2表面官能团和化学元素的变化规律,测试T-SiO2/EP的主要力学性能,研究其在干摩擦条件下的摩擦磨损行为与机制。结果表明:功能化纳米SiO2的引入,有效改善了环氧树脂的力学与摩擦学性能,且当功能化纳米SiO2含量为2%时(质量分数,下同),环氧复合材料(2%T-SiO2/EP)的显微硬度和断裂韧度均达到最大值(70.2HD和1.02MPa·m^1/2),并具有优异的减摩耐磨性能。干摩擦条件下,2%T-SiO2/EP复合材料的摩擦因数和磨损失重分别为0.49和1.7mg,较纯环氧树脂分别降低了31.9%和34.6%,较未改性纳米SiO2增强的环氧树脂复合材料(U-SiO2/EP)分别降低了14%和10.5%,并对相应的磨损机理进行了分析。
Nano-SiO2 surface grafted APTES(T-SiO2)was realized by covalent functionalization technology,and functionalized nano-SiO2 modified epoxy resin composite(T-SiO2/EP)was prepared.The surface functional groups and chemical elements of the functionalized nano-SiO2were analyzed and the mechanical and tribological properties of the T-SiO2/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-SiO2.When the content of functionalized nano-SiO2 is 2%(mass fraction,same as below),the microhardness and fracture toughness of the composites(2%T-SiO2/EP)can reach the maximum,which are 70.2 HD and 1.02 MPa·m^1/2 respectively,moreover,in dry friction condition,the friction coefficient and the wear loss reach the minimum,which are 0.49 mg and 1.7 mg respectively.Compared with pure epoxy resin,they are reduced by 31.9%and 34.6%,and compared with 2%unmodified nano-SiO2 reinforced epoxy resin composite,they are reduced by 14%and 10.5%,and the corresponding wear mechanism is analyzed.
作者
田晋
高立
蔡滨
齐泽昊
谭业发
TIAN Jin;GAO Li;CAI Bin;QI Ze-hao;TAN Ye-fa(Institute of Field Engineering,Army Engineering University of PLA,Nanjing 210007,China;Army Nanjing Military Agency,Nanjing 210024,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2019年第11期92-99,共8页
Journal of Materials Engineering
