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Lubricant bonding, chemical structure, and additive effects on tribological performances at head-disk interfaces

机译：润滑剂结合，化学结构和添加剂对磁头-磁盘界面摩擦学性能的影响

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摘要

The lubricant film for head/disk application consists of bonded fraction and unbonded (mobile) fraction. It is well known that the mobile fraction of the lubricant film can replenish the surface sites where the lubricant film was depleted, thus, the surface wear is postponed or alleviated. With a continuous decrease in the head disk spacing, however, too much mobile fraction of lubricant may cause head slider lubricant pick-up, and deteriorate the interface. Two perfluoropolyether (PFPE) lubricants of Z-tetraol and Z-DOL are discussed in this paper. Lubricant Z-tetraol is characteristic of stronger bonding to a carbon overcoat, lower vapor pressure, and higher thermal stability but less mobility than Z-DOL. It is found that, for CSS (contact-start-stop) durability, the interfaces with Z-tetraol show no worse in performance than those with Z-DOL, and less head slider lubricant pickup on those with Z-tetraol. Based on the above-mentioned, it is possible that the interfaces relying more on the lubricant bonding strength and chemical structure stability are more beneficial to tribological performances than those relying more on the lubricant replenishment. The effects of lubricant additive X1P mixed to Z-tetraol, and z-DOL, respectively are also studied on tribological performances. Stiction, CSS durability, and head slider lubricant pick-up are discussed among lubricants Z-tetraol, Z-DOL, Z-tetraol/X1P and Z-DOL/X1P. Statistical t-test, F-test, and Weibull analyses are applied to CSS data to differentiate CSS durability performances. Additive X1P is found to enhance CSS durability for both lubricants. Lubricant Z-tetraol/X1P is recommended for the best tribological performances, followed by Z-DOL/X1P, Z-tetraol, and Z-DOL.
机译：用于磁头/磁盘的润滑膜由粘合部分和未粘合（移动）部分组成。众所周知，润滑膜的可移动部分可以补充润滑膜被耗尽的表面部位，因此，表面磨损被推迟或减轻。但是，随着磁头磁盘间距的不断减小，润滑剂的流动性过多可能会导致磁头滑块润滑剂堆积，并使接口变差。本文讨论了Z-四醇和Z-DOL的两种全氟聚醚（PFPE）润滑剂。与Z-DOL相比，Z-丁醇润滑剂具有与碳涂层的牢固粘合，较低的蒸气压和较高的热稳定性，但迁移率较低的特征。已经发现，对于CSS（接触启停）耐久性而言，与Z-DOL相比，与Z-Dualol的界面在性能上没有表现差，并且在使用Z-tetraol的界面上磁头滑油的吸收更少。基于以上所述，与更多地依赖于润滑剂补充的那些界面相比，可能更多地依赖于润滑剂的粘合强度和化学结构稳定性的界面对摩擦学性能更有利。还研究了分别与Z-四醇和z-DOL混合的润滑油添加剂X1P的摩擦学性能。在润滑剂Z-tetraol，Z-DOL，Z-tetraol / X1P和Z-DOL / X1P中讨论了静摩擦，CSS耐久性和磁头滑块润滑剂的吸收。统计t检验，F检验和Weibull分析应用于CSS数据，以区分CSS耐久性能。发现添加剂X1P可以增强两种润滑剂的CSS耐久性。建议使用Z-tetraol / X1P润滑剂以获得最佳的摩擦性能，其次是Z-DOL / X1P，Z-tetraol和Z-DOL。

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