Investigation of Lubricant Transfer under Slider Lubricant Contact Condition
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摘要: 为了提高磁头飞行稳定性，增加硬盘使用寿命，基于分子动力学方法建立了磁头磁盘接触状态下的润滑剂迁移模型.根据硬盘工作时磁头磁盘的相对移动速度及磁头在盘片表面飞行时高、低压区域压力差的范围，采用所建立模型分析了相对移动速度及高、低压区域压力差对润滑剂迁移及在盘片表面分布的影响；此外，通过调节模型中单个润滑剂分子的粒子数得到不同长度的润滑剂分子碎片，并分析润滑剂分子碎片对润滑剂迁移的影响。研究结果表明：磁头磁盘之间的润滑剂转移随着相对移动速度及高、低压区域之间压力差的增大而增大.润滑剂转移量在单位压力及单位速度下的增长率分别约为38.8%和6.7%；润滑剂分子碎片对磁头磁盘之间的润滑剂转移影响很小；润滑剂在盘片表面堆积的高度随着磁头磁盘相对移动速度的增加而降低；高、低压区压力差的变化对润滑剂在盘片表面堆积的高度没有影响.Abstract: To enhance slider flying stability and extend the life span of hard-disk drives, a molecular dynamics model for investigating lubricant transfer in the presence of slider lubricant contact was built. The effects of the following parameters on lubricant transfer and lubricant distribution on the disk surface during the operation of the hard-disk drive were analysed:relative velocity between the slider and disk and the range of the air-bearing pressure difference between the high-and low-pressure areas before contact. In addition, lubricant fragments with different lengths were obtained by adjusting the number of beads within a full lubricant molecule. The effect of lubricant fragments on lubricant transfer was also investigated. The simulation results indicate that the amount of lubricant transfer increases with increasing slider-to-disk relative velocity and air-bearing pressure difference; the growth rates of the amount of lubricant transfer are 38.8% and 6.7% for unit air-bearing pressure and unit velocity, respectively. Lubricant fragments have little effect on lubricant transfer; the height of lubricant accumulation decreases with increasing relative velocity. The lubricant accumulation height on the disk surface is not affected by the air-bearing pressure difference.
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Key words:
- lubricant transfer /
- molecular dynamics simulation /
- disk velocity /
- hard disk drive
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图 2 润滑剂分子由磁盘表面转移到磁头表面的过程
Figure 2. Evaluation of lubricant transfer fromdisk to the slider
图 3 润滑剂转移量随着速度V的变化
Figure 3. Relationship between lubricanttransfer and disk velocity V
图 4 不同相对移动速度下的均方根位移曲线
Figure 4. Values of mean square displacement fordifferent velocities
图 5 自扩散系数随着速度V的变化
Figure 5. Value of self-diffusion coefficient asa function of disk velocity
图 7 润滑剂转移量随着高、低压区域压力差的变化
Figure 7. Amount of lubricant transfer asa function of pressure difference
图 8 润滑剂在磁盘表面的分布
Figure 8. Lubricant distribution on disk surface forvarious pressure differences
图 9 润滑剂转移量随着压力差的变化(不包含端基)
Figure 9. Amount of lubricant transfer change withpressure difference (for lubricant fragments withoutfunctional beads)
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