Organic Buildup On Slider Leading Edge Tapers And Its Effect On Wet Stiction

Xuan, J.; Chen, Ga-Lane; Chao, J.

doi:10.1109/intmag.1993.642774

Cited by 2 publications

(2 citation statements)

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“…Broad bands in the 3600-3000, 1669, and 1436 cm 21 areas of Fig. 7 correlate well with other literature studies of polymeric fluorinated carboxylic acids (Carré and Markowitz 1985;Eapen et al 1994;Xuan et al 1993). The presence of a strong broad band at 3600-3000 cm 21 suggests that some of the adsorbed carboxylate is hydrogen-bonded.…”

Section: Postmortem Analysis Of Space Lubricants-fundamental Investigsupporting

confidence: 88%

“…The spectroscopic evidence led to the proposed degradation pathway for all PFPE involving defluorination, chain scission, and formation of carbonyl end groups as suggested in prior literature (Carré 1985;Eapen et al 1994;Xuan et al 1993). Carboxylic acid groups form quickly when carbonyl groups react with humidity in the air, and in turn react with surface metal ion species to form carboxylates.…”

Section: Postmortem Analysis Of Space Lubricants-fundamental Investigmentioning

confidence: 59%

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Liquid Space Lubricants Examined by Vibrational Microspectroscopy

Street

2008

Analytical Letters

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Considerable effort has been expended to develop liquid lubricants for satellites and space exploration vehicles. These lubricants must often perform under a range of harsh conditions such as vacuum, radiation, and temperature extremes while in orbit or in transit and in extremely dusty environments at destinations such as the moon and Mars. Historically, oil development was guided by terrestrial application, which did not provide sufficient space lubricants. Novel fluids such as perfluorinated polyethers provided some relief but are far from ideal. With each new fluid proposed to solve one problem, other problems have arisen. Much of the work performed at National Aeronautics and Space Adminstration's (NASA) Glenn Research Center, in elucidating mechanisms by which chemical degradation of space oils occur, has been done by infrared and Raman microspectroscopy, which this review details. Fundamental lubrication studies are presented as well as actual case studies, in which vibrational spectroscopy led to millions of dollars in savings and potentially prevented loss of mission.

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Section: Postmortem Analysis Of Space Lubricants-fundamental Investigsupporting

confidence: 88%

Section: Postmortem Analysis Of Space Lubricants-fundamental Investigmentioning

confidence: 59%