Influence of Li Grease Thickener Types on Film Thicknesses Formed between Smooth and Dented Surfaces

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F17%3APU125982" target="_blank" >RIV/00216305:26210/17:PU125982 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.jstage.jst.go.jp/article/trol/12/5/12_262/_pdf/-char/en" target="_blank" >https://www.jstage.jst.go.jp/article/trol/12/5/12_262/_pdf/-char/en</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.2474/trol.12.262" target="_blank" >10.2474/trol.12.262</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Influence of Li Grease Thickener Types on Film Thicknesses Formed between Smooth and Dented Surfaces

Popis výsledku v původním jazyce

The lubricant film thickness behaviors of lithium (Li) thickener type greases and their base oil were investigated for the contact between a glass disk and a smooth/dented steel ball using an optical interferometry. The main focus is to understand grease film behaviors including high speed history and contact surface conditions. A Li stearate thickened grease showed similar behaviors to the base oil itself and the thickener particles were not observed on the contact. Thickener particle entrainments were observed in greases with Li 12-hydroxy stearate and Li complex thickeners. Track patterns formed in the downstream of the contacts correlated with the thickener particle entrainments to the contacts. The Li stearate thickened grease showed quick starvation phenomenon without a scoop which maintains fully flooded conditions. The particle entrainments of Li 12-hydroxy stearate and Li complex thickened greases were less observed after measurements at high speeds. On the dented surfaces, the particle entrainments of the Li 12-hydroxy stearate grease were more frequent than those of Li complex grease. These results suggest that thickener chemical structures have influence on the grease film formation. The thickener with higher polarity could promote the entrainment of greases into contact.

Název v anglickém jazyce

Influence of Li Grease Thickener Types on Film Thicknesses Formed between Smooth and Dented Surfaces

Popis výsledku anglicky

The lubricant film thickness behaviors of lithium (Li) thickener type greases and their base oil were investigated for the contact between a glass disk and a smooth/dented steel ball using an optical interferometry. The main focus is to understand grease film behaviors including high speed history and contact surface conditions. A Li stearate thickened grease showed similar behaviors to the base oil itself and the thickener particles were not observed on the contact. Thickener particle entrainments were observed in greases with Li 12-hydroxy stearate and Li complex thickeners. Track patterns formed in the downstream of the contacts correlated with the thickener particle entrainments to the contacts. The Li stearate thickened grease showed quick starvation phenomenon without a scoop which maintains fully flooded conditions. The particle entrainments of Li 12-hydroxy stearate and Li complex thickened greases were less observed after measurements at high speeds. On the dented surfaces, the particle entrainments of the Li 12-hydroxy stearate grease were more frequent than those of Li complex grease. These results suggest that thickener chemical structures have influence on the grease film formation. The thickener with higher polarity could promote the entrainment of greases into contact.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/GA17-23235S" target="_blank" >GA17-23235S: Vliv tepelných vlastností kontaktních těles na tok maziva v Hertzových nehladkých kontaktech</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Tribology Online

ISSN

1881-2198

e-ISSN

—

Svazek periodika

12

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

JP - Japonsko

Počet stran výsledku

12

Strana od-do

262-273

Kód UT WoS článku

000583227700002

EID výsledku v databázi Scopus

2-s2.0-85041035514