Publication detail

Thin film colorimetric interferometry

HARTL, M. LIŠKA, M.

English title

Thin film colorimetric interferometry

Type

journal article - other

Language

en

Original abstract

Measurement technique for the study of very thin lubrication films down to one nanometer in a point contact between a steel hall and a transparent disc is used to explore the relationship between central and minimum film thickness and rolling speed at the interface between elastohydrodynamic and boundary lubrication for a series of lubricating fluids. This technique based on the colorimetric interferometry combines powerful film thickness mapping capabilities with high accuracy. It was confirmed that both hexadecane and mineral base oil obey the linear relationship between log central and minimum film thickness and log rolling speed predicted by elastohydrodynamic theory down to approximately one nanometer. Conversely, squalane and additive-treated mineral base oil showed film thickness enhancement at slow speeds caused by boundary layers formation within the lubricant film. Obtained experimental data was used for the determination of pressure-viscosity coefficients of test fluids. The measurement technique also enabled us to produce information about the influence of boundary layers on film thickness shape.

English abstract

Measurement technique for the study of very thin lubrication films down to one nanometer in a point contact between a steel hall and a transparent disc is used to explore the relationship between central and minimum film thickness and rolling speed at the interface between elastohydrodynamic and boundary lubrication for a series of lubricating fluids. This technique based on the colorimetric interferometry combines powerful film thickness mapping capabilities with high accuracy. It was confirmed that both hexadecane and mineral base oil obey the linear relationship between log central and minimum film thickness and log rolling speed predicted by elastohydrodynamic theory down to approximately one nanometer. Conversely, squalane and additive-treated mineral base oil showed film thickness enhancement at slow speeds caused by boundary layers formation within the lubricant film. Obtained experimental data was used for the determination of pressure-viscosity coefficients of test fluids. The measurement technique also enabled us to produce information about the influence of boundary layers on film thickness shape.

Keywords in English

Lubrication, Film thickness

RIV year

2001

Released

01.04.2001

ISSN

0569-8197

Journal

Tribology Transactions

Volume

44

Number

2

Pages count

276

BIBTEX


@article{BUT39923,
  author="Martin {Hartl} and Ivan {Křupka} and Miroslav {Liška},
  title="Thin film colorimetric interferometry",
  journal="Tribology Transactions",
  year="2001",
  volume="44",
  number="2",
  month="April",
  issn="0569-8197"
}