混杂纤维增强树脂基摩擦材料摩擦学性能研究

STUDY ON TRIBOLOGICAL PROPERTIES OF RESIN-BASED FRICTION MATERIALS REINFORCED BY HYBRID FIBERS

以丁腈橡胶改性酚醛树脂为基体,芳纶/玻纤/钢/铜纤维混杂制备摩擦材料,在干摩擦条件下通过摩擦磨损试验机测试其摩擦学性能,并用扫描电镜(SEM)对摩擦材料的表面磨损形貌进行观察分析,研究不同混杂纤维成分对摩擦材料性能的影响。结果表明,滑动速率增大,材料的摩擦系数、磨损率均减小;实验载荷增大,材料的摩擦系数、磨损率呈现波动状态,未见明显变化趋势。摩擦过程中,含有四种混杂纤维的材料磨损形式为犁沟和塑性变形;未含有芳纶/玻纤混杂纤维的材料磨损形式主要为疲劳磨损;未含有钢/铜混杂纤维的材料磨损形式主要为黏着磨损。由此可见,添加混杂纤维可以有效提高材料的摩擦系数,降低磨损率,并且明显改善材料的摩擦学性能。

The phenolic resin modified by nitrile rubber as matrix,Kevlar / glass / steel / copper fibers as the hybris fibers,prepared friction materials and tested the tribological properties of the materials under dry friction conditions by the friction and wear testing machine,used the scanning electron microscopy（ SEM） to observe the surface of friction materials,studied the effect of different hybrid fiber components on friction material properties. The results show that the friction coefficient and wear rate decrease with the increase of sliding speed,and which have no obvious change trend with the increase of load. In the friction process,the wear form of the friction material which containing four fibers is furrow and the plastic deformation; the wear form of the material not containing Kevlar / glass hybrid fiber is mainly fatigue wear; the wear form of the material not containing steel / copper hybrid fiber is mainly adhesive wear. Thus,adding hybrid fiber can effectively improve the friction coefficient of material,reduce the wear rate,and obviously improve the tribological properties of the material.