层状α-磷酸锆改性聚四氟乙烯摩擦磨损性能

Friction and Wear Properties of Layeredα-Zirconium Phosphate Modified PTFE

以层状α–磷酸锆、聚四氟乙烯(PTFE)乳液为原料,采用含泥复合–塑化方法制备了PTFE/层状α–磷酸锆复合材料,从改性层铅笔硬度、摩擦面表面形貌、摩擦因数、磨损量四个方面分别研究干摩擦和有油润滑条件下不同含量层状α–磷酸锆对PTFE摩擦磨损性能的影响机制。结果表明,无论是在干摩擦条件下还是在有油润滑条件下,添加层状α–磷酸锆的PTFE改性层均具有优异的摩擦磨损性能。随着层状α–磷酸锆含量提高,PTFE改性层的铅笔硬度增加、摩擦因数先降低后升高,磨损量大幅降低;当层状α–磷酸锆质量分数为15%时摩擦因数最低,在干摩擦条件下和有油润滑条件下其摩擦因数较纯PTFE分别降低5%和50%,磨损量较纯PTFE分别降低83.33%和78.57%;通过对摩擦面表面及磨损量的分析得出,干摩擦条件下PTFE改性层的磨损机理以磨粒磨损为主,有油润滑条件下磨损机理以轻微的黏着磨损为主。

The polytetrafluoroethylene(PTFE)/layeredα-zirconium phosphate composite was prepared from the layeredα-zirconium phosphate and PTFE emulsion by a mud-containing composite-plasticizing method.The influence mechanism of different mass fractions of layeredα-zirconium phosphate on the friction and wear properties of PTFE under dry friction and oil lubrication were studied from four aspects:pencil hardness of modified layer,topography of friction surface,friction coefficient and wear amount.The results showed that the modified PTFE layer withα-zirconium phosphate had excellent friction and wear properties under both dry friction and oil lubrication.With the increase of the mass fraction of layeredα-zirconium phosphate,the pencil hardness of the modified PTFE layer increased,and the friction coefficient first decreased and then increased.When the mass fraction of layeredα-zirconium phosphate was 15%,the friction coefficient was the lowest.Under dry friction condition and oil lubrication condition,the friction coefficient of PTFE decreased by 5%and 50%,and the wear amount decreased by 83.33%and 78.57,respectively,compared with pure PTFE.Through the analysis of friction surface and wear amount,it was concluded that the wear mechanism of the modified PTFE layer was mainly abrasive wear under dry friction condition and slightly adhesive wear under oil lubrication condition.