摘要
采用双螺杆挤出造粒工艺制备出改性耐磨PA66复合材料,考察了复合材料的力学性能、摩擦磨损性能以及摩擦性能与润滑剂种类、纤维含量、载荷和对磨时间之间的关系,用光学显微镜(OM)和扫描电镜(SEM)对复合材料的磨损表面进行观察,用X射线光电子能谱仪(XPS)对磨损表面的磨屑进行元素分析。结果表明:在干摩擦条件下玻璃纤维(GF)、聚四氟乙烯(PTFE)和二硫化钼(MoS2)可显著改善PA66复合材料的力学性能和耐磨性能,GF含量为30wt%时PTFE比MoS2对PA66耐磨改性效果显著,GF为35wt%时同时添加PTFE和MoS2的复合材料耐磨性能最好。随着摩擦时间的增大,复合材料摩擦系数先增大后减小并趋于稳定;随着载荷的增大,复合材料摩擦系数和磨耗量增大。PA66复合材料的磨损主要以疲劳磨损和磨粒磨损为主。
The wear-resistant polyamide 66 (PA66) composites were prepared with a twin-screw extruder. The mechanical properties, friction and wear properties of the composites were inspected. The relationship between the tribological properties and the main factors including lubricant type, glass fiber content, load and sliding time was investigated. Worn surfaces were examined by optical microscope and scanning electric microscope (SEM). Element analysis of wear debris on the worn surfaces was carried out using X-ray spectroscopy (XPS). Results show that un- der dry friction glass fiber( GF), polytetrafluorothylene(PTFE) and molybdenum disulfide( MoS2 ) can significantly improve the mechanical, friction and wear properties of PA66 composites. PTFE is more significantly effective on the friction and wear properties than MoS2 when the amount of GF is 30wt%. The best effect of the modification on the composites can be attained in the proportion of 35wt% GF when both PTFE and MoS2 were added. Friction co- efficient of the composites first increase, then reduce to be stable as sliding time increases. Friction coefficient and wear mass loss increase as load increases. The main wear mechanism of PA66 composites are fatigue and abrasion wears.
出处
《机械科学与技术》
CSCD
北大核心
2009年第1期31-35,共5页
Mechanical Science and Technology for Aerospace Engineering
关键词
PA66
复合材料
耐磨改性
摩擦磨损性能
机理
PAd6
composites
wear resistant modification
friction and wear property
mechanism