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

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 a...

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Autores principales:	Kazumi Sakai, David Kostal, Yuji Shitara, Motohiro Kaneta, Ivan Krupka, Martin Hartl
Formato:	article
Lenguaje:	EN
Publicado:	Japanese Society of Tribologists 2017
Materias:	grease ehl film thickness lubricants track pattern Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/56b6e75c4a7d435583f7bb3227fe988d
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spelling	oai:doaj.org-article:56b6e75c4a7d435583f7bb3227fe988d2021-11-05T09:19:54ZInfluence of Li Grease Thickener Types on Film Thicknesses Formed between Smooth and Dented Surfaces1881-219810.2474/trol.12.262https://doaj.org/article/56b6e75c4a7d435583f7bb3227fe988d2017-12-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/12/5/12_262/_pdf/-char/enhttps://doaj.org/toc/1881-2198The 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.Kazumi SakaiDavid KostalYuji ShitaraMotohiro KanetaIvan KrupkaMartin HartlJapanese Society of Tribologistsarticlegreaseehlfilm thicknesslubricantstrack patternPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 12, Iss 5, Pp 262-273 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	grease ehl film thickness lubricants track pattern Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	grease ehl film thickness lubricants track pattern Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Kazumi Sakai David Kostal Yuji Shitara Motohiro Kaneta Ivan Krupka Martin Hartl Influence of Li Grease Thickener Types on Film Thicknesses Formed between Smooth and Dented Surfaces
description	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.
format	article
author	Kazumi Sakai David Kostal Yuji Shitara Motohiro Kaneta Ivan Krupka Martin Hartl
author_facet	Kazumi Sakai David Kostal Yuji Shitara Motohiro Kaneta Ivan Krupka Martin Hartl
author_sort	Kazumi Sakai
title	Influence of Li Grease Thickener Types on Film Thicknesses Formed between Smooth and Dented Surfaces
title_short	Influence of Li Grease Thickener Types on Film Thicknesses Formed between Smooth and Dented Surfaces
title_full	Influence of Li Grease Thickener Types on Film Thicknesses Formed between Smooth and Dented Surfaces
title_fullStr	Influence of Li Grease Thickener Types on Film Thicknesses Formed between Smooth and Dented Surfaces
title_full_unstemmed	Influence of Li Grease Thickener Types on Film Thicknesses Formed between Smooth and Dented Surfaces
title_sort	influence of li grease thickener types on film thicknesses formed between smooth and dented surfaces
publisher	Japanese Society of Tribologists
publishDate	2017
url	https://doaj.org/article/56b6e75c4a7d435583f7bb3227fe988d
work_keys_str_mv	AT kazumisakai influenceofligreasethickenertypesonfilmthicknessesformedbetweensmoothanddentedsurfaces AT davidkostal influenceofligreasethickenertypesonfilmthicknessesformedbetweensmoothanddentedsurfaces AT yujishitara influenceofligreasethickenertypesonfilmthicknessesformedbetweensmoothanddentedsurfaces AT motohirokaneta influenceofligreasethickenertypesonfilmthicknessesformedbetweensmoothanddentedsurfaces AT ivankrupka influenceofligreasethickenertypesonfilmthicknessesformedbetweensmoothanddentedsurfaces AT martinhartl influenceofligreasethickenertypesonfilmthicknessesformedbetweensmoothanddentedsurfaces
_version_	1718444410765574144

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

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