Evaluation of Several Space Lubricants Using a Vacuum Four-Ball Tribometer

Jones, William; Poslowski, Agnieszka K.; Shogrin, Bradley A.; Herrera-Fierro, P.; Jansen, Mark J.

doi:10.1080/10402009908982223

Cited by 22 publications

(11 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In earlier studies, thin lubricant layers were applied to PoD and SOT discs and thickness was quantified by direct reflectance micro-FTIR with grazing angle objectives to enhance sensitivity (Shogrin et al 2003;Jones, Poslowski et al 1999;Shogrin et al 1996). Calibration was performed by establishing optical constants for Beer's law by measuring film thickness with ellipsometry in the visible wavelength range (Pepper 1995).…”

Section: Lubricant Quantification In Studies By Ftirmentioning

confidence: 99%

“…The standard ASTM method D4172-94(2004)E1, adapted for ultrahigh vacuum measurements, was used to compare wear rates of various PFPE fluids (143AC, S-200, and Z-25) with three synthetic hydrocarbons, a MAC (2001a), a MAC formulated with antiwear and antioxidant additives (2001), and an unformulated PAO (PAO-100), as well as an unformulated silahydrocarbon (pentasilahydrocarbon) (Jones, Poslowski et al 1999). The wear rates determined in this investigation were ranked as follows:…”

Section: Postmortem Analysis Of Space Lubricants-fundamental Investigmentioning

confidence: 99%

See 1 more Smart Citation

Liquid Space Lubricants Examined by Vibrational Microspectroscopy

Street

2008

Analytical Letters

View full text Add to dashboard Cite

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.

show abstract

Section: Lubricant Quantification In Studies By Ftirmentioning

confidence: 99%

Section: Postmortem Analysis Of Space Lubricants-fundamental Investigmentioning

confidence: 99%

Liquid Space Lubricants Examined by Vibrational Microspectroscopy

Street

2008

Analytical Letters

View full text Add to dashboard Cite

show abstract

“…Using the vacuum four-ball tribometer, the friction and wear characteristics of the neat pentasilahydrocarbon were compared to the three commercially available PFPEs and an unformulated Pennzane (Figure 11) [21]. As can be seen, this unformulated silahydrocarbon has wear rates comparable to Pennzane and superior to the PFPEs.…”

Section: Triboloqical Propertiesmentioning

confidence: 99%

Research on liquid lubricants for space mechanisms

Jones

Shogrin

Jansen³

2000

J of Synthetic Lubrication

Self Cite

View full text Add to dashboard Cite

Four research areas at the NASA Glenn Research Center involving the tribology of space mechanisms are highlighted.These areas include: soluble boundary lubrication additives for perfluoropolyether liquid lubricants, a Pennzane dewetting phenomenon, the effect of ODC-free bearing cleaning processes on bearing lifetimes and the development of a new class of liquid lubricants based on silahydrocarbons.

show abstract

“…MACs consisting of a di-and tri-substituted (2-octylodecyl) cyclopentane ring possess potential applicability towards aerospace mechanisms and micro electromechanical systems (MEMS) due to their good chemical inertness, excellent viscosity properties, low volatility, low pour points and high thermal stability. Extensive research has demonstrated that MACs possess excellent tribological properties as a lubricant on earth and in space [63][64][65].…”

Section: Liquid Lubricantsmentioning

confidence: 99%

Carbon-based solid-liquid lubricating coatings for space applications-A review

2015

View full text Add to dashboard Cite

Despite continuous improvements in machine elements over the past few decades, lubrication issues have impeded human exploration of the universe because single solid or liquid lubrication systems have been unable to satisfy the ever-increasing performance requirements of space tribology. In this study, we present an overview of the development of carbon-based films as protective coatings, with reference to their high hardness, low friction, and chemical inertness, and with a particular focus on diamond-like carbon (DLC) films. We also discuss the design of carbon-based solid-liquid synergy lubricating coatings with regards to their physicochemical properties and tribological performance. Solid-liquid composite coatings are fabricated via spinning liquid lubricants on solid lubricating films. Such duplex lubricating coatings are considered the most ideal lubrication choice for moving mechanical systems in space as they can overcome the drawback of adhesion and cold-welding associated with solid films under harsh space conditions and can minimize the crosslinking or chain scission of liquid lubricants under space irradiation. State of the art carbon-based solid-liquid synergy lubricating systems therefore holds great promise for space applications due to solid/liquid synergies resulting in superior qualities including excellent friction reduction and anti-wear properties as well as strong anti-irradiation capacities, thereby meeting the requirements of high reliability, high precision, high efficiency, and long lifetime for space drive mechanisms.

show abstract

Evaluation of Several Space Lubricants Using a Vacuum Four-Ball Tribometer

Cited by 22 publications

References 16 publications

Liquid Space Lubricants Examined by Vibrational Microspectroscopy

Liquid Space Lubricants Examined by Vibrational Microspectroscopy

Research on liquid lubricants for space mechanisms

Carbon-based solid-liquid lubricating coatings for space applications-A review

Contact Info

Product

Resources

About