Publication detail

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

SAKAI, K. KOŠŤÁL, D. SHITARA, Y. KANETA, M. KŘUPKA, I. HARTL, M.

Original Title

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

Type

journal article in Web of Science

Language

English

Original Abstract

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.

Keywords

grease, EHL, film thickness, lubricants, track pattern

Authors

SAKAI, K.; KOŠŤÁL, D.; SHITARA, Y.; KANETA, M.; KŘUPKA, I.; HARTL, M.

Released

31. 12. 2017

Publisher

Japanese Society of Tribologist

Location

JAPAN

ISBN

1881-2198

Periodical

Tribology Online

Year of study

12

Number

5

State

Japan

Pages from

262

Pages to

273

Pages count

12

URL

https://www.jstage.jst.go.jp/article/trol/12/5/12_262/_pdf/-char/en

BibTex

@article{BUT142910,
  author="SAKAI, K. and KOŠŤÁL, D. and SHITARA, Y. and KANETA, M. and KŘUPKA, I. and HARTL, M.",
  title="Influence of Li Grease Thickener Types on Film Thicknesses Formed between Smooth and Dented Surfaces
",
  journal="Tribology Online",
  year="2017",
  volume="12",
  number="5",
  pages="262--273",
  doi="10.2474/trol.12.262",
  issn="1881-2198",
  url="https://www.jstage.jst.go.jp/article/trol/12/5/12_262/_pdf/-char/en"
}