玻璃纤维粉对聚合物基超声电机摩擦材料性能的影响

Influence of GF Powder on Properties of Polymer-based Friction Materials of Ultrasonic Motor

为获得硬度高、耐磨性好、满足超声电机低速大力矩运行要求的摩擦材料,采用冷压烧结法制备玻璃纤维粉改性聚合物基摩擦材料,研究玻璃纤维粉体积分数对摩擦材料力学性能、超声电机性能以及摩擦学性能的影响。结果表明:玻璃纤维粉可以增大摩擦材料的弹性模量和硬度,降低材料冲击韧性;摩擦材料的摩擦因数随玻璃纤维粉体积分数的增加有明显提升;玻璃纤维粉可以改善摩擦材料的超声电机性能和耐磨性,随着玻璃纤维粉体积分数的增加,摩擦材料的超声电机驱动性能先提高后下降,材料的磨损机制由黏着磨损向较为严重的疲劳磨损转变。在文中研究范围内,玻璃纤维粉体积分数为30%时改性摩擦材料具有最好的超声电机驱动性能和耐磨性。

In order to obtain the friction materials that have high hardness and good abrasion resistance, and can meet the requirements of low speed and large torque operation of ultrasonic motor, the glass fiber powder filled polymer-based friction materials were prepared by cold pressing and sintering.The effect of the content of glass fiber powder on the me- chanical and tribological properties, and the electrical properties of polymer-based friction materials was studied. Experi- mental results show that the glass fiber powder can improve the hardness, elastic modulus and impact toughness of friction materials, and the friction coefficient of friction materials is obviously improved with the increase of the content of glass fi- ber powder.The glass fiber powder with proper content can improve the performance of ultrasonic motor and wear resistance of friction materials, with the increase of the content of glass fiber powder, the performance of ultrasonic motor of the fric- material is increased first and then decreased, the wear mechanism of the material is changed from adhesive wear to se- vere fatigue wear.Under the experimental conditions, the best volume fraction of glass fiber powder is 30% for the polymer- based friction materials.