Cyclic Phosphazenes as Advanced Lubricants for Thin Film Magnetic Media

Perettie, D. J.; Johnson, William F.; Morgan, Ted; Kar, Kamal K.; Potter, Gregg E.; DeKoven, Benjamin M.; Putzig, C. L.; Chao, J.; Lee, Y. C.; Gao, Chenjing; Russak, M. A.

doi:10.1142/9789812819321_0012

Cited by 8 publications

(5 citation statements)

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“…Kasai et al [19] and Kasai [20] showed that PFPE degradation is catalysed by Lewis acid sites present on the Al 2 O 3 of the Al 2 O 3 ±TiC slider surface. Perettie et al [7] indicated that there was no decomposition of X-1P in contact with the Al 2 O 3 ±TiC surface; however, no direct evidence of catalytic degradation of Z-Dol under typical operating conditions was presented [4].…”

Section: Degradation Of Hydrogenated Carbon Coatings On Mechanically mentioning

confidence: 99%

“…Yang et al [6] reported that X-1P by itself performs well on hard disks during contact start±stop (CSS) and stiction tests with a lubricant thickness of about 0.5 nm. Perettie et al [7] reported that X-1P outperformed Z-Dol in CSS testing at 30 8C and 80 per cent relative humidity and had comparable CSS performance at ambient conditions, and there was no decomposition of X-1P in contact with the Al 2 O 3 ±TiC surface. Zhao and Bhushan [4] reported that X-1P exhibits better tribological performance than Z-Dol in drag, CSS and ball-on-flat tests.…”

Section: Introductionmentioning

confidence: 99%

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Lubrication studies of head-disk interfaces in a controlled environment: Part 1: Effects of disk texture, lubricant thermal treatment and lubricant additive on the durability of the head-disk interface

Zhao

Bhushan

2000

Proceedings of the Institution of Mechanical Engineers, Part J:

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Decomposition and tribological performance of Z-Dol and X-1P lubricants on the magnetic recording thin-film disks are studied during sliding in a high-vacuum environment. Gaseous products generated from the head±disk interfaces and frictional force are detected and monitored as functions of the sliding distance by using a quadrupole mass spectrometer and friction measurements. The thin-film disks with mechanical and laser texture were used and different thermal treatments were applied to the lubricant films. The effects of the disk texture, lubricant thermal treatment and lubricant additive on the degradation and durability of head±disk interface, are studied in detail. Experimental results show that, firstly, fluorocarbon fragments are generated from lubricants during a period of sliding with a low and stable coefficient of friction, followed by a sharp rise in the frictional force and generation of gaseous products of diamond-like carbon overcoat material. The disk texture has effects on the decomposition of the lubricant and durability of the head±disk interface; the laser-textured disk surface caused Z-Dol lubricant to decompose at lower sliding distances and with more gaseous species compared with the mechanically textured disk. Thermal treatment of the lubricant films and the application of X-1P as an additive to the ZDol lubricant improved the durability of the head±disk interfaces.

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Section: Degradation Of Hydrogenated Carbon Coatings On Mechanically mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Lubrication studies of head-disk interfaces in a controlled environment: Part 1: Effects of disk texture, lubricant thermal treatment and lubricant additive on the durability of the head-disk interface

Zhao

Bhushan

2000

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…The decreased population density of hydroxyl units would lead to increased vulnerability to catalytic degradation at low RH. This exposure could be abated by using a Lewis base additive such as X1P (partially fluorinated hexaphenoxy-cyclotriphosphazene) [9,10]. A mixture of Z-dol and X1P, however, has a miscibility issue.…”

Section: Summary and Commentsmentioning

confidence: 99%

Hydrogen bonding in lubricants for hard disk drives

Kasai

Raman

2006

Tribol Lett

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Hydrogen bonding interaction within a small ensemble of water molecules, that within a group of water molecules and endgroups of Z-dol and Z-tetraol, and the effect of electrolyte ionic pair such as LiCl upon these interactions were examined by the molecular dynamics method based on the potential given by a semi-empirical SCF quantum mechanics. It was revealed that the strength of the hydrogen bond increased rapidly as the size of droplet increased, relating to the population density of hydroxyl units, and that such interaction was amplified significantly by the presence of electrolyte ionic pair. An extraordinary interaction was thus predicted between Z-tetraol and aqueous solution of alkali halide. An experimental study thence conducted revealed that Z-tetraol and aqueous NaCl solution (2 M) formed an extremely stable water-in-oil type emulsion. The emulsion consists of spheroids of several nanometers across wherein several thousands of water molecules are encased by several tens of Z-tetraol endgroups. The interfacial layer of each spheroid is formed and stabilized by the hydrogen bonding interaction between the hydroxyl units of the tetraol-ends and water molecules enhanced by the electrolyte ionic pairs. When disks coated with Z-tetraol were tested for flyability at high humidity, the head-disk interaction detected acoustically increased with time. Spontaneous formation of globules resulting from interaction of tetraol end-groups and water molecules assisted by ubiquitously present alkali halide contaminant would account for the observed increase of the head-disk interaction. Possible structures of perfluoropolyether lubricants ideal for magnetic disk application are discussed.

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“…A new approach which combines the main base lubricant (AMXXXX or ZDOL) with an additive has been shown to provide better wear [6], [7]. This new system also minimizes friction and material build up at the interface..…”

Section: Designing Disks For Proximity Recordingmentioning

confidence: 99%

Proximity recording design considerations

Doan¹

1997

IEEE Trans. Magn.

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Proximity recording" terminology has been used for the head/media system with the head jlying close to the media surface. With current media technology, the glide avalanche is about 1 pin ; a head which flies at less than 2 pin has been considered to be in the proximity regime. To date there has been little amounts of literature or study on this subject. This paper proposes a new regime of the head/media interface that the proximity recording technology is based upon. It is called the pseudo contact regime. This paper will present new considerations in the designs of airbearing and suspensions for the proximity recording head as well as additional tribological issues. IntroductionIn magnetic recording the most effective way to gain higher areal density has been to reduce spacing loss. Flying height is one of the largest contributors, hence there is a large body of literature and much research focused on this topic. Engineers in the magnetic recording industry have been able to bring the flying height down from 10 pin to 2 pin in a ten year period. This accomplishent is credited both to the airbearing designers and the tribologists.

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Cyclic Phosphazenes as Advanced Lubricants for Thin Film Magnetic Media

Cited by 8 publications

References 0 publications

Lubrication studies of head-disk interfaces in a controlled environment: Part 1: Effects of disk texture, lubricant thermal treatment and lubricant additive on the durability of the head-disk interface

Lubrication studies of head-disk interfaces in a controlled environment: Part 1: Effects of disk texture, lubricant thermal treatment and lubricant additive on the durability of the head-disk interface

Hydrogen bonding in lubricants for hard disk drives

Proximity recording design considerations

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