Anomalous low friction under boundary lubrication of steel surfaces by polyols

L. Joly-Pottuz, J. M. Martin, M. I. De Barros Bouchet, M. Belin

研究成果: Article査読

34 被引用数 (Scopus)

抄録

We present here anomalous low friction obtained with highly polished steel on steel hard contact lubricated by glycerol under severe mixed and boundary regimes (λ ratio below 1). We investigated the effects of contact pressure, sliding speed, and temperature on friction coefficient and electrical contact resistance. The mechanism of low friction (typically below 0.02) is thought to have two origins: first a contribution of an ultrathin EHL film of glycerol providing easy shear under pressure, second the chemical degradation of glycerol inside the contact when more severe conditions are attained, generating a nanometer-thick film containing shear-induced water molecules. This new mechanism, called "H-bond Network model", is completely different from the well-accepted "Monolayer" model working with polar molecules containing long aliphatic chains. Moreover, we show outstanding superlubricity (friction coefficient below 0.01) of steel surfaces directly lubricated by a solution of myo-inositol (also called vitamin Bh) in glycerol at ambient temperature (25 °C) and high contact pressure (0.8 GPa) in the absence of any long chain polar molecules. Mechanism is still unknown but could be associated with friction-induced dissociation of inositol and H-bond interactions network of water-like species with steel surface.

本文言語English
ページ(範囲)21-29
ページ数9
ジャーナルTribology Letters
34
1 SPEC. ISS.
DOI
出版ステータスPublished - 2009 4月
外部発表はい

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 表面および界面
  • 表面、皮膜および薄膜

フィンガープリント

「Anomalous low friction under boundary lubrication of steel surfaces by polyols」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル