Tribological performance of ceramics in lubricated ultrasonic motors
Tribological performance of ceramics in lubricated ultrasonic motors
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DOI：
10.1016/j.wear.2016.02.006
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发表时间：
2016-04
期刊：
影响因子：
5
通讯作者：
W. Qiu;Y. Mizuno;Kentaro Nakamura
中科院分区：
文献类型：
--
作者：
W. Qiu;Y. Mizuno;Kentaro Nakamura
小型超声波电机是由压电换能器的振荡驱动的。它们主要应用于需要精确运动的设备部件，如相机中自动对焦镜头的驱动器，以及机器人和定位设备中的执行器。虽然润滑已被证明对提高超声波电机的性能是有效的，但摩擦材料仍然发挥着重要的作用。在本研究中，研究了四种不同的工程陶瓷，包括氧化铝(Al_2O_3)、氧化锆(ZrO_2)、碳化硅(SiC)和氮化硅(Si3N_4)在自匹配构型中的适用性。通过对候选材料在实际超声马达结构中的测试，确定了这些陶瓷在润滑条件下的主要磨损机制，其中断裂是最主要的磨损因素。在所测试的四种陶瓷中，ZrO2被发现是最有前途的材料，因为它表现出最温和的磨损和令人满意的摩擦水平。研究结果还表明，陶瓷的断裂韧性比其硬度更重要。本研究为选择可用于长寿命、润滑型超声波马达的摩擦材料提供了指导。
Small ultrasonic motors are driven by the oscillation of piezoelectric transducers. They are primarily applied to equipment components that require precise movements, such as drivers for auto-focus lenses in cameras, and actuators in robots and positioning devices. While lubrication has been proven effective in improving the performance of ultrasonic motors, the friction materials still play a significant role. In this study, the suitability of four different engineering ceramics, which included alumina (Al2O3), zirconia (ZrO2), silicon carbide (SiC), and silicon nitride (Si3N4), were investigated in the self-mated configuration. By testing the candidate materials in the actual ultrasonic motor configuration, the main wear mechanisms of these ceramics were identified under lubricated conditions, with fracture being the most dominant contributor to their wear. Among the four tested ceramics, ZrO2was found to be the most promising material as it exhibited the mildest wear and a satisfactory level of friction. The obtained results also indicate that the fracture toughness of ceramics is more critical than their hardness. This study provides guidelines for selecting friction materials that can be used in long-lived, lubricated ultrasonic motors.