竹炭/碳纤维增强树脂基摩擦材料摩擦磨损性能

采用腰果壳油改性酚醛树脂和丁腈橡胶为粘结剂,具有高弹性模量和高强度的碳纤维为增强纤维,竹炭、重晶石和蛭石等为填料,采用热压成型工艺制备树脂基摩擦材料,研究了竹炭含量对摩擦材料的剪切强度、密度和摩擦磨损性能的影响,借助扫描电镜观察磨损表面形貌并分析磨损机理。结果表明:随着竹炭含量的增加,材料的剪切强度和密度相应减少;添加竹炭能明显提升在250℃和350℃下的摩擦系数,对于100℃下的摩擦系数影响较小;增加竹炭含量,材料的磨损率逐渐变大,磨损机制由单一磨粒磨损向黏着磨损和磨粒磨损的复合磨损机制转变。

Tribological Properties of Bamboo Charcoal/Carbon Fiber Reinforced Resin Based Composite Friction Materials

Using cashew nut shell oil modified phenolic resin and crylonitrile-butadiene rubber as binder,carbon fiber with high modulus of elasticity and high strength as strengthening fiber,bamboo charcoal,barite and vermiculite as filler,the friction materials based on phenolic resin matrix were prepared by hot-pressing molding process. The effects of the content of bamboo charcoal on the shear strength,density and friction and wear properties were studied. The wear morphology was observed by using scanning electron microscopy,and the wear mechanism was analyzed. The results show that with the addition of the content of bamboo charcoal,the shear strength and density of the material decrease accordingly. Friction coefficient of the sample with the bamboo charcoal compare with the no bamboo charcoal material there is a significantly improve at 250℃ and 350℃,but has a slight effect at 100℃ . The wear rate also show the growing trend with the increase of the content of bamboo charcoal. With the addition of bamboo charcoal content,the friction mechanism is changed from a single abrasive wear to a combination of abrasive wear and adhesive wear.