Processing of Cotton–Phenolic Bearing Retainers for Optimum Performance of Spacecraft High-Speed Rotating Systems

Sathyan, K.

doi:10.1080/10402004.2014.1002597

Cited by 7 publications

(5 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The common porous materials are cotton‐phenolic, nylon, polyphenylene sulfide (PPS), poly(ether ether ketone) (PEEK), polyimide (PI), and ceramics . Among these materials, polyimide has attracted great attention owing to its excellent advantages, such as mechanical properties, chemical stability, heat and wear resistance performance, especially a large number of pores available for oil storage and more controlled process of preparation …”

Section: Introductionmentioning

confidence: 99%

Selectively enhanced oil retention of porous polyimide bearing materials by direct chemical modification

Zhang

Wang

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

Porous polyimide (PI) materials containing lubricating oil have been widely used as bearing retainers in aerospace industry. High oil content and retention of porous bearing materials play an important role in assuring a successful mission of the spacecraft. Keeping both oil content and retention of bearing retainer materials high, however, is one of the bottlenecks to fulfill long lifetime missions. Chemical modification is expected to break this limitation by changing the surface properties. Inspired by this, here for the first time, the authors design a chemical method to improve silicon oil retention of porous PI samples. The results indicated that this modification could not only change the wettability of PI from hydrophilicity to hydrophobicity but also enhance the silicon oil retention from 52% to 87%. This strategy provides a novel approach to improve the oil retention of porous PI materials, which has the potential application in preparing bearing retainers with reliable, long‐term performance. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45106.

show abstract

Section: Introductionmentioning

confidence: 99%

Selectively enhanced oil retention of porous polyimide bearing materials by direct chemical modification

Zhang

Wang

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…The selected separation guarantees that there will be no force interaction for the upper and lower substrates. The surface roughness is a factor that highly affects the performance of the two fretting interfaces [30,31]. Therefore, when the analysis is focused on micro principles, it is reasonable to simulate the single asperity in a hemisphere shape [32].…”

Section: Fretting Layer Configurationmentioning

confidence: 99%

Multiscale analysis of friction behavior at fretting interfaces

et al. 2020

View full text Add to dashboard Cite

Friction behavior at fretting interfaces is of fundamental interest in tribology and is important in material applications. However, friction has contact intervals, which can accurately determine the friction characteristics of a material; however, this has not been thoroughly investigated. Moreover, the fretting process with regard to different interfacial configurations have also not been systematically evaluated. To bridge these research gaps, molecular dynamics (MD) simulations on Al-Al, diamond-diamond, and diamond-silicon fretting interfaces were performed while considering bidirectional forces. This paper also proposes new energy theories, bonding principles, nanoscale friction laws, and wear rate analyses. With these models, semi-quantitative analyses of coefficient of friction (CoF) were made and simulation outcomes were examined. The results show that the differences in the hardness, stiffness modulus, and the material configuration have a considerable influence on the fretting process. This can potentially lead to the force generated during friction contact intervals along with changes in the CoF. The effect of surface separation can be of great significance in predicting the fretting process, selecting the material, and for optimization.

show abstract

“…Nowadays, friction and lubrication are required to be accomplished under harsh working conditions, such as high speed, high stress, high vacuum, and strong radiation, which require the materials to have superior tribological properties, corrosion resistance, and long working life. [1][2][3][4][5] Accordingly, self-lubricating materials have recently emerged as one of promising technologies to address these issues. [6][7][8][9][10][11] Zhang et al [12] prepared epoxy (EP) composites filled with short carbon fibers (SCF) and silicon dioxide (SiO 2 ) nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Mesoporous silica as smart lubrication containers applied to self‐lubricating polyurethane materials

Cui

Yang

et al. 2020

J of Applied Polymer Sci

View full text Add to dashboard Cite

Self-lubricating composite with stimuli-responsive properties attracts great interest in recent years. Herein, mesoporous silica (MS) as oil-laden containers is explored to achieve self-lubricating feature. The as-prepared MS possesses a high Brunauer-Emmett-Teller (BET) surface area (1,542.35 m 2 /g), which satisfies the criterion for construction of ideal repository for storing enough liquid lubricants. In addition, the thermal stimuli-responsiveness behavior of the oil-laden mesoporous silica (OMS) for lubrication has been investigated by thermogravimetric analyzer tester. As expected, an excellent tribological performance (friction coefficient and wear rate decreased by 63.29 and 82.63%) is obtained by adding 10 wt% OMS into the polyurathene matrix, showing great promise for self-lubricating application.

show abstract

Processing of Cotton–Phenolic Bearing Retainers for Optimum Performance of Spacecraft High-Speed Rotating Systems

Cited by 7 publications

References 13 publications

Selectively enhanced oil retention of porous polyimide bearing materials by direct chemical modification

Selectively enhanced oil retention of porous polyimide bearing materials by direct chemical modification

Multiscale analysis of friction behavior at fretting interfaces

Mesoporous silica as smart lubrication containers applied to self‐lubricating polyurethane materials

Contact Info

Product

Resources

About