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首页> 外文会议>World Tribology Congress III vol.1; 20050912-16; Washington,DC(US) >STIFFNESS AND DAMPING OF MOLECULARLY THIN PFPE LUBRICANT BRIDGING BETWEEN MAGNETIC DISK AND DIAMOND PROBE TIP
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STIFFNESS AND DAMPING OF MOLECULARLY THIN PFPE LUBRICANT BRIDGING BETWEEN MAGNETIC DISK AND DIAMOND PROBE TIP

机译：磁性圆盘与金刚石探针尖之间的分子筛PFPE润滑剂桥接的刚度和阻尼

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摘要

Spring constants and damping coefficients of a molecularly thin liquid bridge of PFPE lubricant intervening between a diamond probe tip and diamond like carbon (DLC) surface of a magnetic disk are identified through regression analysis of tip damping vibration. Perfluoropolyether (PFPE) lubricants having functional end groups were used to form the liquid bridge between the DLC surface and a probe tip with the notably small curvature radius of 0.1 μm. The tip was both retracted from and extended toward the disk surface at four different, progressive distances to attain varied elongation of the bridge, and was made to vibrate at each step to provide damping waveforms. By applying regression analysis to observed waveforms, the spring constant and the damping coefficient of the liquid bridge were identified. It is interesting to note that both the absolute value of the spring constant and the frequency-multiplied damping decrease with bridge elongation, and after reaching the minimum, those values begin to increase.
机译：通过对尖端阻尼振动进行回归分析，确定了介于金刚石探针和金刚石类碳（DLC）表面之间的PFPE润滑剂分子稀液桥的弹簧常数和阻尼系数。具有功能性端基的全氟聚醚（PFPE）润滑剂用于形成DLC表面和探针尖端之间的液桥，其曲率半径特别小，为0.1μm。尖端以四个不同的渐进距离从磁盘表面缩回并向磁盘表面延伸，以达到不同的桥伸长率，并使其在每一步振动以提供阻尼波形。通过对观察到的波形进行回归分析，可以确定液桥的弹簧常数和阻尼系数。有趣的是，弹簧常数的绝对值和倍频阻尼都随着桥的伸长而减小，并且在达到最小值之后，这些值开始增大。

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