MEMS Center, Harbin Institute of Technology, Harbin, 150001, PR China.
State Key Laboratory of Urban Water Resource & Environment (Harbin Institute of Technology), Harbin, 150001, China.
Sci Rep. 2017 Jul 20;7(1):6061. doi: 10.1038/s41598-017-05546-z.
The resistance of the bearing is a significant factor affecting the performance of the ball-disk rotor gyroscope. The micro and nano combined surface with low surface energy material modifications can be hydrophobic. This can reduce the drag when the bearing is lubricated by deionized water. Laser ablation method is utilized to form micron-scaled structures on the surface of the stainless steel rotor ball. And the nanostructures are formed by PEI (Polyetherimide) regulated ZnO nanowires growth. After low surface energy material modification, the water contact angle of processed surface was 163° and the sliding angle was less than 4°. The maximum rotational speed was enhanced by up to 82.77% at 1.5 W driving power. Experiments show that the superhydrophobic drag-reduction spherical bearing has good short-term reliability. At 5 V drive voltage, the bearing can extend the rotational speed of ball-disk rotor gyroscope to 35000 rpm, and maintain the normal operation for longer than 40 minutes. This is quite meaningful for short-term-work or one-time-use rotor gyroscopes.
轴承的阻力是影响球盘转子陀螺仪性能的一个重要因素。采用微纳复合表面低表面能材料修饰可以实现疏水性，这可以降低球盘转子陀螺仪在去离子水润滑时的阻力。利用激光烧蚀的方法在不锈钢转子球表面形成微米级结构，通过聚醚酰亚胺（PEI）调控氧化锌纳米线的生长形成纳米结构。经过低表面能材料修饰后，处理表面的水接触角为 163°，滑动角小于 4°。在 1.5 W 驱动功率下，最大转速提高了 82.77%。实验表明，具有超疏水减阻性能的球形轴承具有良好的短期可靠性。在 5 V 驱动电压下，该轴承可将球盘转子陀螺仪的转速提高到 35000 rpm，并能维持 40 多分钟的正常运行。这对于短期工作或一次性使用的转子陀螺仪具有重要意义。
