Tribology and Mechanics of Magnetic Storage Devices

Bhushan, Bharat; Talke, Frank E.

doi:10.1115/1.2920598

Cited by 42 publications

(83 citation statements)

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“…The product was dried in vacuum at 80°C overnight and further purified by column chromatograph. The molecular weight: 1…”

Section: Synthesis Of Lube Oil Idl2mentioning

confidence: 99%

“…The surfaces of hard disk media are deposited with a thin film of lubricant such as perfluoropolyether (PEPE) to protect the hard disk surface in a wide range of environmental conditions. 1 The media surface must be well protected from asperity contact to ensure the reliability of a hard disk drive and hence to extend its life cycle. Normally, a lubricant film with a thickness of 1-2 nm is deposited on the hard disk surface.…”

Section: Introductionmentioning

confidence: 99%

“…The crude product was purified by column chromatography using a mixture of ethyl acetate/hexane of a volume ratio of 2:3 as the eluent. A white solid of about 3.00 g was obtained, Yield, 55% 1. H NMR (400 MHz, CDCl 3 ) δ (ppm): 6.77 (dd, 4H, J = 9.2 Hz, Ar-H), 4.50 -4.40 (m, 1H), 4.20 -4.10 (m, 1H,), 4.03 -3.98 (m, 1H), 3.93 -3.85 (m, 2H), 1.46 (s, 3H), 1.40 (s, 3H).…”

mentioning

confidence: 99%

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Synthesis and properties of cyclotriphosphazene and perfluoropolyether‐based lubricant with polar functional groups

Wang

Tan

Cho

et al. 2016

Lubrication Science

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A novel hard disk lubricant IDL2 was synthesised by reacting sodium 4‐((2,2‐dimethyl‐1,3‐dioxolan‐4‐yl)methoxy)phenoate with hexachlorocyclotriphosphazene, followed by treatment with 1H,1H‐perfluoro‐3,6,9‐trioxatridecan‐1‐ol in the presence of sodium hydride and subsequent hydrolysis using sulfuric acid. The chemical structure of IDL2 was confirmed by proton nuclear magnetic resonance (1H NMR), phosphorus‐31 (31P) NMR spectroscopy and mass spectrometer. The thermal property of IDL2 was analysed using thermal gravimetric analysis (TGA) and it shows better thermal stability than two commercial lubricants Z‐DOL and Z‐Tetraol with two and four terminal hydroxy groups, respectively. IDL2 was found to have comparable hydrophobicity to commercial lubricants Z‐DOL, A20H and Z‐Tetraol with water contact angles in the range of 78 – 85°, revealing that IDL2 has analogous surface energy to these commercial lubricants. IDL2 exhibits comparable friction coefficient to A20H and Z‐Tetraol, but much lower than Z‐DOL. More interestingly, it has a much high bonding ratio when compared with commonly used commercial lubricants under the same testing conditions due to the presence of two polar hydroxy groups, which enhance the interaction between lubricant and substrate. These promising properties of IDL2 show that it would be very potential for real application as a hard disk drive lubricant. Copyright © 2016 John Wiley & Sons, Ltd.

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“…The product was dried in vacuum at 80°C overnight and further purified by column chromatograph. The molecular weight: 1…”

Section: Synthesis Of Lube Oil Idl2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Synthesis and properties of cyclotriphosphazene and perfluoropolyether‐based lubricant with polar functional groups

Wang

Tan

Cho

et al. 2016

Lubrication Science

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“…Hardness measurements on extremely thin films on a submicron scale using commercially available depthsensing instruments require a minimum thickness of 100 nm. In the macroscopic regime hardness is determined by the applied normal load divided by either the curved (surface) area (Brine11 hardness number, Rockwell hardness number, and Vickers hardness number) or the projected area of contact between the indenter and the material being tested under load (Knoop hardness number and Berkowich hardness number) (Bhushan 1990).…”

Section: Nanohardness Investigations Of Thin-films By An Afmmentioning

confidence: 99%

Applications of scanning probe microscopies in technology and manufacturing

Persch

Born²,

Engelmann³

et al. 1993

Scanning

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Within the last 10 years the scanning probe microscopies (SPMs) have been applied to a variety of problems with the main emphasis on scientific applications. The SPM techniques have to date also found their technical applications. The simple concept can easily be adapted to a variety of different applications in high technologic manufacturing processes. The scanning tunneling microscope is now considered as a standard measuring equipment, in the meantime there exists a whole family of SPMs with promising applications in not only a pure scientific environment but also in a manufacturing environment. As examples for industrial applications, we report on magnetic force microscopic investigations, on magnetic storage device components, and on a relatively new technique for nanohardness investigations of thin‐films by an atomic force microscope.

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“…Composites containing ferromagnetic particles and polymeric binders are also used extensively in magnetic recording and data storage media (4)(5)(6). For example, acicular y-Fe,O, is a typical magnetic powder widely used in recording tape manufacture.…”

Section: Introductionmentioning

confidence: 99%

Effects of flow induced orientation of ferromagnetic particles on relative magnetic permeability of injection molded composites

Fiske

Gokturk

Yazici

et al. 1997

Polymer Engineering & Sci

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Composite samples consisting of ferromagnetic asymmetric particles incorporated into a polyolefin binder were injection molded using custom designed molds which produced preferential fiber orientations. The relative magnetic permeability values of the composites were measured as a function of the filler volume fraction, injection rate, gate diameter, temperature, aspect ratio of the fibers, and fiber orientation. Fiber orientation was affected by the molding conditions and controlled the relative magnetic permeability of the composites. The degree of fiber orientation was significantly affected by the size of the opening (gate) to the mold, or by the mold geometry going from an edge‐gated cylindrical to a center‐gated disk cavity. Relative permeability values of the composites were observed to increase when the fiber orientation and the applied field were parallel to one another. For instance, highly aligned composite samples exhibited up to 30% greater relative permeability values compared to those samples which exhibit fiber orientation distributions approaching a random distribution. To our knowledge this is the first study that provides data linking the fiber orientation distribution functions of ferromagnetic asymmetric particles to the relative magnetic permeability values of injection molded composites.

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Tribology and Mechanics of Magnetic Storage Devices

Cited by 42 publications

References 0 publications

Synthesis and properties of cyclotriphosphazene and perfluoropolyether‐based lubricant with polar functional groups

Synthesis and properties of cyclotriphosphazene and perfluoropolyether‐based lubricant with polar functional groups

Applications of scanning probe microscopies in technology and manufacturing

Effects of flow induced orientation of ferromagnetic particles on relative magnetic permeability of injection molded composites

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