仿生多孔润滑耐磨CF/PTFE/PEEK复合材料的设计及其摩擦学性能

Biomimetic Design and Tribological Properties of Porous Lubricating Wear-resistance CF/PTFE/PEEK Composite

采用模压-滤取和高温真空熔渍工艺制备了自身发汗式润滑耐磨多孔CF/PTFE/PEEK复合材料。考察了造孔剂(NaCl)、PTFE的含量及炭纤维层间间距对多孔PEEK复合材料结构和摩擦学性能的影响。结果表明,当PTFE含量为20%(质量分数,下同)、NaCl为30%、炭纤维层间间距为0.4mm所得多孔CF/PTFE/PEEK复合材料摩擦因数和磨损率最低,200N下摩擦因数、磨损率分别为0.0192,3.47×10-16 m3/Nm,较经典CF/PEEK复合材料摩擦因数降低了9倍,耐磨性提高了25倍。原因在于复合材料中PTFE能形成连续的转移膜,降低了材料摩擦因数;NaCl形成的多孔结构能储存住一定润滑油脂,摩擦过程中在载荷和温度的作用下能形成稳定润滑油膜,明显降低了材料磨损量;炭纤维布起到支撑骨架作用,并协同PTFE,NaCl提高多孔PEEK复合材料摩擦磨损性能。

Using molded-leaching and high temperature vacuum melting technologies,the self-sweating lubrication wear-resistance porous CF/PTFE/PEEK composites were prepared.The effects of porogen（NaCl）,PTFE content and the distance between each of two CF layers on porous PEEK composite material structure and tribological behavior were investigated.The results show that the porous CF/PTFE/PEEK composite material contains 20%（mass fraction,the same below）PTFE,30% NaCl and the distance between two CF layers of 0.4mm has the lowest friction coefficient and wear rate.When load is 200N,comparing with classic CF/PEEK composites,the friction coefficient of the porous CF/PTFE/PEEK composite decreases 9 times and wear resistance increased by 25 times.PTFE in the porous composites can form continuous transfer films which reduce the friction coefficient,and the porous structure can store certain lubricant grease which results in stable lubricating oil film during sliding.Thereby,above mentioned advantages significantly reduce the friction and wear rate of porous sweating composite.In addition,the carbon fiber cloth shows the role of skeleton supporting effect,and also cooperating with PTFE,NaCl to improve the wear resistance of porous PEEK composite material.