功能化纳米SiO<sub>2</sub>改性环氧树脂复合材料及其摩擦磨损行为与机制

doi:10.11868/j.issn.1001-4381.2018.001293

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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。

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	田晋
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	齐泽昊
	谭业发

关键词 ：环氧树脂(EP), 纳米SiO₂, 复合材料, 表面改性, 摩擦磨损

Abstract：

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 70.2HD and 1.02MPa·m^1/2 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-SiO₂ reinforced epoxy resin composite, they are reduced by 14% and 10.5%, and the corresponding wear mechanism is analyzed.

Key words： epoxy resin nano-SiO₂ composites surface modification friction and wear

收稿日期: 2018-11-06 出版日期: 2019-11-21

中图分类号:

TB332

通讯作者: 高立 E-mail: gaoli5429@163.com

作者简介: 高立(1984-), 女, 讲师, 硕士, 研究方向为高分子复合材料, 联系地址:江苏省南京市秦淮区海福巷1号陆军工程大学野战工程学院(210007), E-mail:gaoli5429@163.com

引用本文:

田晋, 高立, 蔡滨, 齐泽昊, 谭业发. 功能化纳米SiO₂改性环氧树脂复合材料及其摩擦磨损行为与机制[J]. 材料工程, 2019, 47(11): 92-99.
Jin TIAN, Li GAO, Bin CAI, Ze-hao QI, Ye-fa TAN. Tribological behavior and wear mechanism of modified nano-SiO₂ reinforced epoxy composites. Journal of Materials Engineering, 2019, 47(11): 92-99.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.001293 或 http://jme.biam.ac.cn/CN/Y2019/V47/I11/92

Fig.1 纳米SiO₂的红外光谱图

Fig.2 纳米SiO₂的EDS图谱
(a)未改性纳米SiO₂; (b)改性纳米SiO₂

Table 1 EP, U-SiO₂/EP和T-SiO₂/EP的邵氏显微硬度

Fig.3 EP, U-SiO₂/EP和T-SiO₂/EP的断裂韧度

Fig.4 EP, U-SiO₂/EP和T-SiO₂/EP复合材料断面SEM图
(a)EP; (b)2%U-SiO₂/EP; (c)2%T-SiO₂/EP

Fig.5 复合材料的摩擦因数随时间的变化曲线
(a)U-SiO₂/EP; (b)T-SiO₂/EP

Fig.6 复合材料摩擦因数和磨损失重变化规律

Fig.7 EP磨损表面形貌

Fig.8 2%U-SiO₂/EP复合材料的磨损表面形貌

Fig.9 复合材料断裂韧度与磨损失重的关系

Fig.10 2%T-SiO₂/EP复合材料的磨损表面形貌

Fig.11 复合材料邵氏硬度与磨损失重的关系

Fig.12 1%T-SiO₂/EP复合材料的磨损表面形貌

Fig.13 3%T-SiO₂/EP复合材料磨损表面形貌图

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