Accession Number : ADA135067

Title :   Study of the Lubrication Mechanism of Thin Film Lubricated Concentrated Steel Contacts. The Influence of Pre-Treatment of the Steel on the Load Carrying Capacity.

Descriptive Note : Final technical rept. Apr 82-Sep 83,


Personal Author(s) : Begelinger,A ; Gee,A W J de

PDF Url : ADA135067

Report Date : Sep 1983

Pagination or Media Count : 38

Abstract : The effect of the thermochemical surface treatments carburizing, ion-nitriding and liquid-nitriding on the load carrying capacity at high speed (4 m/s) of sliding crossed cylinders of steel, thin film lubricated with a marine diesel engine oil of 60 C, is described for three values of running-in distance, namely 0 m, 30 m and 300 m; running-in being performed at a speed of 0.1 m/s. It is shown that when using untreated surfaces of ball bearing steel 100 Cr 61), carburized surfaces or ion-nitrided surfaces, loading in excess of a critical load value FNc causes a transition from partial elastohydrodynamic lubrication to unlubricated contact (scuffing regime). When using liquid-nitrided surfaces, loading in excess of FNc leads to a transition from partial EHD lubrication of boundary lubrication. This shows that liquid-nitriding considerably increases the upper limit of the temperature range in which boundary lubrication is possible.

Descriptors :   *Lubricating films, *Sliding contacts, *Sliding friction, *Steel, Thermochemistry, Surfaces, Carburizing, Nitrides, Lubrication, Test and evaluation, Loads(Forces)

Subject Categories : Lubricants and Hydraulic Fluids
      Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE