A facile method for fabricating super-slippery surface with long term and high-efficiency sustained release performance
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Penetration (warfare)
Immersion
Mineral oil
Environmentally Friendly
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Grease
Dry lubricant
Molybdenum disulfide
Suspension
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Before the proper lubricant selection can be made, the tribological system must be identified to its fullest extent. This system includes the type of motion, speeds, temperatures, loads and the environment that is specific to the application. Once these parameters are identified, lubrication engineers or tribo-engineers can use their knowledge of the different lubricant chemistries to make a lubricant selection that will optimize the performance of the application. In addition to lubricant chemistry knowledge, the lubrication engineer also must analyze the application based on the identified tribological system. This analysis includes such topics as speed factors, elastohydrodynamic lubrication, extreme pressure lubrication, emergency lubrication and various special application requirements.
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Transparent-pin wear tests with in-situ microellipsometer measurement were performed on thin-film magnetic disks with different lubricants. We found that pin wear started when the decrease in the lubricant thickness at the pin slide-path leveled-off and that pin wear sometimes started when the lubricant thickness was still larger than that of the adsorbed lubricant. These mean that the free lubricant on the disk surface is not replenishing the real points of pin-disk sliding. Consequently, we considered that the replenishment of free lubricant to the real points of pin sliding is more important than the fact whether the average lubricant thickness exceeds the adsorbed lubricant thickness or not. Tests on disks with different lubricants show that the lower the lubricant viscosity, the greater the lubricant loss and the smaller the pin wear. We find that a low-viscosity-lubricant is better in replenishing free lubricant to the real points of sliding than high-viscosity-lubricant is.
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Thus far, it has been shown that lubricant depletion occurs at a relatively low temperature of approximately 200°C in thermally assisted magnetic recording (TAMR). Because the lubricant on the disk surface plays an important role in maintaining the reliability and durability of the head-disk interface (HDI), lubricant depletion is one of the critical issues in hard disk drives. Thus, there is a great need to develop technology that supplies lubricant to the HDI as the amount of lubricant decreases, so that the thickness of the lubricant film remains constant. In this study, we conducted a fundamental study of vapor lubrication using perfluoropolyether (PFPE) lubricants as the first step. In other words, we conducted an experimental study to elucidate the fundamental mechanism of vapor lubrication and to investigate the technological feasibility of applying vapor lubrication to hard disk drives. In addition, the possibility of using vapor lubrication in hard disk drives with contact sliders was also investigated. As a result, it was confirmed that vapor lubrication would be useful to overcome the lubricant depletion issue.
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Journal bearings are widely used for supporting high-speed rotational machinery, such as turbines compressors and HDD spindles, because of their high load carrying capacity, stability, and durability. Recently, the engineering trend is oriented to higher speed and smaller sizes of rotational machinery, and then it is important to enhance the stability of the journal bearings. From latest work, high stability is obtained under the starved lubrication conditions. However, the temperature rise of the lubricant may occur under the starved lubricatioa Therefore, it is necessary to know the temperature characteristics of the bearings under the starved lubrication. In this paper, the temperature rise of the lubricant under the starved lubrication in the small borejournal bearing is examined. It is found that the starved lubrication allows suppressing the temperature rise by selecting an appropriate supply lubricant quantity and reducing the friction loss.
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Flying height
Dry lubricant
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Admixture of lubricant with metal powder can assist or retard densification according to the applied pressure and the lubricant content. Lubricant exuded on to the die wall under pressure seems to be the main lubricating factor. The change-over or transition pressure from lubrication to inhibition varies in a Gaussian manner with lubricant content. Molecular films of lubricant are sufficient, but for reduction in ejection pressure a minimum content of 0.2% lubricant is necessary. Die-wall lubrication is far more useful and effective than admixed lubricant. Simultaneous die lubrication and admixture is of no value.
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Magnetic head wear performance was studied usingvarious kinds of D-4OH lubricant thickness of hard disk(HD) media. Different characteristic behavior wasobserved in each lubricant thickness. The difference ofthe behavior was well related with media frictioncoefficiency. At the same time, surface free energychanged as well as it. According to lubricant coverageanalysis, it was found that the head wear behaviordepended on the lubricant coverage and head mediainteraction. Furthermore, molecular dynamics methodwas applied to observe lubricant molecular distributionand the coverage changed as a function of lubricantthickness.
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