填充聚四氟乙烯对尼龙6摩擦磨损性能影响的研究

用Timken试验机考察了热压成形的PTFE填充尼龙6在干摩擦状态下的摩擦磨损性能及PTFE填充量、滑动速度和负荷对摩擦磨损的影响,并用X-光电子能谱仪(XPS)和电子探针(EPMA)研究了金属偶件摩擦表面转移膜的组成与形貌。结果表明,在给定的试验条件下,填充PTFE能够有效地改善尼龙6的摩擦磨损性能,PTFE的填充量在8～20％(vol)之间时的效果较好,8％PTFE填充尼龙6的PV值可比纯尼龙6的高1倍;填充PTFE的效用主要取决于转移膜的特性和PTFE在转移膜中的富集量。

A Study on the Influence of Filling PTFE on the Friction and Wear Properties of Nylon 6

PTFE filled nylon 6 was prepared by hot-pressing method using PTFE powder and nylon 6 powder. The effects of PTFE content, the load and sliding velocity on friction and wear properties of filled and unfilled nylon 6 under dry friction condition were evaluated using a Timken tester. X-ray Photoelectron Spectroscopy (XPS) and Electron Probe Microanalyzer (EPMA) were used to study the topography and the composition of the transfer film on the test ring surfaces. It was found that PTFE is quite effective to reduce friction and wear of filled nylon6 when the content of PTFE is 8 to 20 %(vol).While the content of PTFE is higher than 20 %(vol) or lower than 8 %(vol), the friction and wear increase, because of lower hardness of the filled nylon 6 or less content of PTFE in transfer film. Timken tests showed that the PV value of 8 %(vol) PTFE filled nylon 6 is twice as that of the unfilled nylon 6. XPS and EPMA analysis indicated that the formation of a compact, well-distributed and rich PTFE transfer film is the determining factor for the lower friction and wear of filled nylon 6 materials.