Publication detail

Behavior of thin viscous boundary films in lubricated contacts between micro-textured surfaces

KŘUPKA, I. HARTL, M. POLIŠČUK, R.

Czech title

Chování viskózních mezných filmů v mazaných kontaktech mezi třecími povrchy s cílenou modifikací topografie

English title

Behavior of thin viscous boundary films in lubricated contacts between micro-textured surfaces

Type

journal article - other

Language

en

Original abstract

Thin film colorimetric interferometry was used to map changes in film thickness in the vicinity of micro-dents of various depths produced on rubbing surfaces. It has been shown in recent studies that shallow micro-features within concentrated contact can increase mean film thickness by supplying more lubricant to the contact; however, this beneficial effect can also be accompanied by a local film thickness reduction. Nevertheless, these observations were done with mineral base oils that exhibited no boundary films formation. In this study the behavior of micro-textured surfaces are observed using formulated lubricant containing polyalcylmethacrylate (PAMA), viscosity index improver with boundary film forming properties. Obtained results show that an enlarged film thickness due to the presence of viscous boundary films is formed within the whole contact and these boundary films minimize the local film thickness reduction caused by micro-dents and further increase the efficiency of surface texturing within non-conformal contacts. It can be suggested from the obtained results that joint action of both boundary film formation and surface texturing combines both contributions that can help to increase tribological performances in different stages of machine parts operation by increasing lubrication film thickness.

Czech abstract

Článek shrnuje výsledky studia chování viskózních mezných filmů v mazaných kontaktech mezi třecími povrchy s cílenou modifikací topografie.

English abstract

Thin film colorimetric interferometry was used to map changes in film thickness in the vicinity of micro-dents of various depths produced on rubbing surfaces. It has been shown in recent studies that shallow micro-features within concentrated contact can increase mean film thickness by supplying more lubricant to the contact; however, this beneficial effect can also be accompanied by a local film thickness reduction. Nevertheless, these observations were done with mineral base oils that exhibited no boundary films formation. In this study the behavior of micro-textured surfaces are observed using formulated lubricant containing polyalcylmethacrylate (PAMA), viscosity index improver with boundary film forming properties. Obtained results show that an enlarged film thickness due to the presence of viscous boundary films is formed within the whole contact and these boundary films minimize the local film thickness reduction caused by micro-dents and further increase the efficiency of surface texturing within non-conformal contacts. It can be suggested from the obtained results that joint action of both boundary film formation and surface texturing combines both contributions that can help to increase tribological performances in different stages of machine parts operation by increasing lubrication film thickness.

Keywords in Czech

tenké mazací filmy; tloušťka; cílená modifikace topografie; mezné filmy

Keywords in English

Thin film lubrication; Film thickness; Surface texturing; Boundary films

RIV year

2008

Released

12.05.2008

Publisher

Elsevier

Location

NL

ISSN

0301-679X

Journal

Tribology International

Volume

42

Number

X

Pages from–to

1–7

Pages count

7

BIBTEX


@article{BUT47111,
  author="Ivan {Křupka} and Martin {Hartl} and Radek {Poliščuk},
  title="Behavior of thin viscous boundary films in lubricated contacts between micro-textured surfaces",
  journal="Tribology International",
  year="2008",
  volume="42",
  number="X",
  month="May",
  pages="1--7",
  publisher="Elsevier",
  address="NL",
  issn="0301-679X"
}