纸基摩擦材料的磨损机理分析

Wear Mechanisms of Paper-based Friction Material: Analysis of Worn Surface and Thermal Decay

通过对纸基摩擦材料的磨损表面及其热衰退性能进行分析,初步探讨了纸基摩擦材料的磨损机理。研究表明,在剪切力及压力的反复作用下,摩擦材料表面的纤维发生严重的磨损,并产生磨屑;其中,植物纤维的磨损更为严重。磨损表面产生严重的界面分离,甚至发生纤维的脱落。磨损时所产生的纤维磨屑及填料磨粒镶嵌于植物纤维中或陷于材料的孔隙中,不会对材料的磨损性能造成明显影响。热分析表明,磨损使得热性能较差的植物纤维发生显著的热衰退,材料的热性能下降。这些结果表明,纸基摩擦材料的磨损机理主要为黏着磨损和疲劳磨损。

Compared with metal-and rubber-based friction materials paper-based friction material is a novel friction material which is widely used in oil-immersed clutches in automatic transmissions of automibiles or even engineering machines.In this paper,we investigated the wear mechanisms of the paper-based friction material by analyzing its worn surface and thermal decay.Results showed that the fibres（especially the plant fibres） were abraded seriously when friction material was subjected to repeated shear and compression.Fibres debonded from resin due to weak interfacial strength.The fractions of fibres and abrasive filler were entrapped in the soft fibres and micro pores,which would not promote the abrasion.In addition,the friction material also occurred thermal decay,mainly due to the degradation of the plant fibres.These observations indicated that the main wear mechanisms are adhesion wear and fatigue wear.