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Research on functionally divided protective overcoat films for improving tribological characteristics of magnetic disks

改善磁盘摩擦学特性的功能分割保护涂层膜的研究

基本信息

批准号：
14350080
负责人：
KAWAKUBO Youichi
金额：
$ 9.6万
依托单位：
Shinshu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

The purpose of this research is to reduce magnetic head wear in hard disk drives to realize contact recording systems to improve information recording density. For this purpose, a new concept of functionally divided protective overcoat films was proposed and the methods to produce the film were investigated. In functionally divided protective overcoat films, the carbon overcoat film on a magnetic disk was divided into two films. Lower layer is devoted for corrosion resistance and wear durability with high hardness, while the upper layer reduces friction between head and disk and head wear with low hardness asperities. With this functionally division, we expected high performance protective overcoat films on magnetic disks.However, it is not common to produce island type carbon film on flat carbon film. The search for the production methods was very difficult. Finally, we have found that the filtered cathodic arc (FCA) deposition method would successfully produce desired films. Nitrogenated FCA carbon films with asperities less than 10 nm height were shown to be able to reduce pin wear in pin-on-disk type wear test. This proved that functionally divided protective overcoat films are possible.This concept would increase the height of asperities and it was considered to be a broblem for lower head disk spacing. Then, disk burnishing techniques to disk asperity heights were studied parallel to the above. The effect of burnishing conditions on head wear were investigated and showed that both conventional tape burnishing and newly proposed contact burnishing with diamond burnishing sliders were effective in reducing head wear.In addition to above, the effects of disk lubricant on head wear were also studied. It was shown that the higher the morecular weight of a lubricant the lower the head wear and phosphazene type functional end group was more effective in reducing head wear than hydroxyl end groups was.

本研究的目的在于减少硬盘磁头的磨损，以实现接触式记录系统，提高信息记录密度。为此，提出了功能分离保护膜的概念，并研究了功能分离保护膜的制备方法。在功能上分开的保护外涂层膜中，磁盘上的碳外涂层膜被分成两层膜。下层用于耐腐蚀性和耐磨性，具有高硬度，而上层用于降低磁头和磁盘之间的摩擦和磁头磨损，具有低硬度粗糙度。基于这种功能划分，我们期望在磁盘上形成高性能的保护膜，然而，在平坦碳膜上制备岛状碳膜并不常见。寻找生产方法是非常困难的。最后，我们发现过滤阴极弧（FCA）沉积方法将成功地产生所需的薄膜。在销-盘型磨损试验中，具有小于10 nm高度的微凸体的氮化FCA碳膜被示出能够减少销磨损。这证明了功能分离保护膜是可能的，这一概念将增加微凸体的高度，并被认为是降低磁头磁盘间距的一个问题。在此基础上，研究了圆盘抛光技术对圆盘粗糙度的影响。研究了抛光条件对磁头磨损的影响，结果表明，传统的砂带抛光和新提出的金刚石滑块接触抛光都能有效地降低磁头磨损，此外，还研究了磁盘润滑剂对磁头磨损的影响。结果表明，润滑剂的分子量越大，头部磨损越小，磷腈型官能端基比羟基端基在减少头部磨损方面更有效。