The Adsorption of Slider Air Bearing Surface and the Behavior of Adsorbed Film under Ulta-high Shear Flow

超高剪切流下滑块空气轴承表面吸附及吸附膜行为

• 批准号: 17560122
• 负责人: BO ZHANG
• 金额: $ 2.05万
• 依托单位: Saga University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560122/
• 关键词: Micro; nano tribology; Head; disk interface; Langmuir adsorption; Pumping effect; Contamination; Takeoff and touchdown load; High shear strain; Hard disk drive; 吸着; 空気軸受; 希薄効果; ポンピング効果; せん断流; スライダ; 磁気ヘッド

Theoretical analysis based on the pumping effect with the Langmuir adsorption shows that,1. The pumping effect may be divided into two classifications depending on the value of the parameter λ: the shear flow rate-controlling pumping effect for λ<0.1 and the adsorption rate-controlling pumping effect for λ>0.4.2. When λ>10, molecular dynamics should be used for analysis of the movement of the adsorbed molecules on the slider surface instead of the continuum such as proposed in this paper, because the adsorbed film is so thin that adsorbed molecules distributes sparsely on the slider surface.3. The accumulation rate of the contaminant is proportional to the disk surface velocity, but inversely proportional to the flying height of the slider for λ<0.1Experiments on the behaviour of the takeoff and touchdown of the air bearing shows that,1. There are takeoff load and touchdown load, and the air bearing functions normally only in between the loads.2. The takeoff load corresponds to the preload, and the touchdown load the load capacity. The takeoff load increases slightly with the disk speed, while the touchdown load decreases as the disk speed increases.

基于朗缪尔吸附的泵浦效应的理论分析表明：1.根据参数λ的值，泵送效应可以分为两类：λ<0.1时的剪切流率控制泵送效应和λ> 0.4时的吸附率控制泵送效应。当λ>10时，由于吸附膜很薄，吸附分子在滑块表面的分布很稀疏，因此应采用分子动力学方法来分析吸附分子在滑块表面的运动，而不是本文所提出的连续介质.当λ<0.1时，污染物的累积速率与磁盘表面速度成正比，而与滑块的飞行高度成反比。有起飞载荷和着陆载荷，空气轴承功能正常，只有在负载之间.起飞载荷对应于预载荷，着陆载荷对应于载荷能力。起飞载荷随轮盘速度的增加而略有增加，而着陆载荷随轮盘速度的增加而减小。

项目成果

The evaporation and readsorption of lubricant film molecules in hard disks

硬盘中润滑油膜分子的蒸发和再吸附

• 发表时间: 2005
• 期刊: Microsystem Technologies. 11
• 作者: 張 波;中島 晃
• 通讯作者: 中島 晃

Pumping effect of sliders in hard disk systems

• DOI: 10.1007/s11249-004-2755-6
• 发表时间: 2005
• 期刊: Tribology Letters
• 影响因子: 3.2
• 作者: Bo Zhang;A. Nakajima