Zobrazeno 1 - 10
of 204
pro vyhledávání: '"Tomoko, Hirayama"'
Autor:
Naoki Yamashita, Tomoko Hirayama
Publikováno v:
Frontiers in Mechanical Engineering, Vol 10 (2024)
In boundary lubrication, adsorbed molecular films formed by lubricant additives on the metal surfaces of sliding parts effectively reduce friction and wear. A method is presented for simultaneously measuring friction and the gap at a metal–lubrican
Externí odkaz:
https://doaj.org/article/01744535ea784ad59a4da930ab3b88f1
Publikováno v:
Frontiers in Mechanical Engineering, Vol 10 (2024)
Grease is used as a lubricant in a wide range of fields, including bearings, because it reduces friction, prevents harmful wear of components, protects against rust and corrosion, and acts as a seal to prevent the invasion of dirt and water. Although
Externí odkaz:
https://doaj.org/article/032a8fdb85fa4009836adb80ece86b61
Publikováno v:
Tribology Online, Vol 18, Iss 7, Pp 469-481 (2023)
Epoxy-UHMWPE composites were filled with squalane, a hydrogenated form of naturally occurring hydrocarbon lubricant, squalene. The hybrid composite composition of 15 mass% of UHMWPE, 2 mass% of squalane and the rest epoxy was found to be the optimum
Externí odkaz:
https://doaj.org/article/777c53253a3844dfaaf19879bad07b9d
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-9 (2023)
Abstract An operando analysis method has been established for evaluating the interfacial structure of an adsorbed layer formed by an additive on a metal surface under fluid lubricated conditions. A parallel-face narrow gap viscometer installed in an
Externí odkaz:
https://doaj.org/article/18aa21b8c4234abca74eeb2f164e24ce
Autor:
Naoki Yamashita, Tomoko Hirayama, Norifumi L. Yamada, Yutaro Shimizu, Kazuhiro Oda, Hideki Kawamoto
Publikováno v:
Tribology Online, Vol 17, Iss 4, Pp 246-256 (2022)
An investigation was conducted of the low-friction and low-wear mechanism of the adsorbed layer formed by dibasic acid ester derivative. First, the film thickness and film density of the adsorbed layer on an iron surface was evaluated by neutron refl
Externí odkaz:
https://doaj.org/article/90d96266937d4a54995fee0f1038cb9e
Autor:
Weiqi Shen, Dongjiang Han, Tomoko Hirayama, Naoki Yamashita, Tadashi Oshio, Hideo Tsuneoka, Kazuo Tagawa, Kazuhiro Yagishita
Publikováno v:
Tribology Online, Vol 17, Iss 3, Pp 216-226 (2022)
The friction coefficient when a Fe surface was lubricated with an additive mixture of N-Oleoyl sarcosine (NOS), a commercial organic friction modifier, and zinc dialkyldithiophosphate (ZDDP) was measured at 100°C using a ball-on-disk tribometer unde
Externí odkaz:
https://doaj.org/article/35a9688a6f944ef0b8268c746bf65a4a
Autor:
Weiqi Shen, Dongjiang Han, Tomoko Hirayama, Naoki Yamashita, Tadashi Oshio, Hideo Tsuneoka, Kazuo Tagawa, Kazuhiro Yagishita
Publikováno v:
Tribology Online, Vol 17, Iss 3, Pp 227-238 (2022)
The tribological properties of a mixture of a commercial organic friction modifier, N-oleoyl sarcosine (NOS), and a commercial anti-wear additive, zinc dialkyldithiophosphate (ZDDP), were investigated. The results suggest a synergistic effect between
Externí odkaz:
https://doaj.org/article/e4287eb39933418c9261317bbf8838dc
Publikováno v:
Tribology Online, Vol 16, Iss 4, Pp 271-278 (2021)
Ball bearings on the main shaft of rocket engine turbopumps which supply cryogenic propellants to the main combustion chamber are critical elements of the entire propulsion system of a rocket. A self-lubricating ball bearing with a retainer made of g
Externí odkaz:
https://doaj.org/article/f8dcc99775cf46838330b077c1fc9e7c
Autor:
Yuxi Song, Kenji Fukuzawa, Tomoko Hirayama, Naoki Yamashita, Norifumi L. Yamada, Shintaro Itoh, Naoki Azuma, Hedong Zhang
Publikováno v:
Macromolecules. 56:1954-1964
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3b2a0e14f3eb803a64255473d12727e1
https://doi.org/10.1021/acs.macromol.2c02238
https://doi.org/10.1021/acs.macromol.2c02238
Publikováno v:
Journal of Tribology. 145
The friction characteristics of SUS440C-Si3N4 lubricated by polytetrafluoroethylene (PTFE) under cryogenic environment have not been researched well. The lubrication mechanisms in such friction condition need to be clarified to improve the fidelity o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5f5ebcd5ac8ca88e6f34aaa4c8bdd2fe
https://doi.org/10.1115/1.4062486
https://doi.org/10.1115/1.4062486