摘要
利用石墨和聚四氟乙烯(PTFE)对聚醚醚酮(PEEK)进行混杂改性,控制PTFE和PEEK的质量比不变,通过冷压烧结的方法在不锈钢表面制备不同石墨质量分数的PEEK基复合涂层,研究石墨含量对涂层力学和摩擦性能的影响。结果表明:随着石墨质量分数的增多,PEEK基复合涂层的结晶度逐渐下降,涂层的硬度先增高后降低,摩擦因数不断降低,磨损率先降低后上升。在石墨质量分数为4%时,硬度最高21.78HV,摩擦因数为0.0461,磨损率最低为2.06×10^(-6)mm^3/(N·m),这与之前的研究相比,涂层的耐磨性得到大幅提高。但是过高的石墨质量分数会使分子链柔顺性下降、链段运动降低,涂层的耐磨性大大降低。
In this paper,polyetheretherketone is modified by graphite and polytetrafluoroethylene. The PEEK composite coatings with different graphite mass fraction are prepared on the surface of stainless steel by cold pressing sintering method controling the mass ratio of polytetrafluoroethylene and polyether ether ketone unchanged. The results show that the crystallinity of the PEEK composite coating decreases gradually,the hardness of the coating firstly increases and then decreases,the friction coefficient of the composite coating decreases,the wear rate decreases first and then increases with the increase of the graphite mass fraction. When the mass fraction of graphite is 4%,the hardness is the highest（21. 78HV）,the friction coefficient is 0. 0461,the lowest wear rate is 2. 06 × 10^-6mm^3/（ N·m）. The wear resistance of the coatings significantly increase compared to the previous study. However,the high graphite mass fraction will decrease the flexibility of molecular chain. The segment movement is declined. The wear resistance of the coating is greatly reduced.
出处
《宇航材料工艺》
CSCD
北大核心
2017年第4期31-36,共6页
Aerospace Materials & Technology
基金
国家自然科学基金项目(50972086)
陕西省教育厅产业化中试项目(2011TG24)
关键词
PEEK
石墨
PTFE
复合涂层
冷压烧结
Polyetheretherketone
Graphite
Polytetrafluoroethylene
Composite coatings
Cold pressing sintering method
