Preliminary Evaluation of Greases to 316 degree C and Solid Lubricants to 816 degree C in Ball Bearings

Abstract

A special apparatus designed for the evaluation of high-temperature lubricants in 20-mm-boreball bearings is described. The results of bearing runs at temperatures up to 1500 deg F (816 deg C) in air are reported. At 450 deg and 600 deg F (232 deg and 316 deg C), a fluoro-carbon grease lubricated the 440-C steel bearings for longer times than did polyphenyl ether and silicone greases thickened with dyes and/ or MoS. Cobalt alloy ball bearings, lubricated either with barium fluoride - calcium fluoride coatings bonded to the cages or with porous metal cages impregnated with these fluorides, ran successfully at 1200 deg and 1500 deg F (650 deg and 816 deg C) under a thrust load of 30 lb (134 N) and at a shaft speed of 5000 rpm.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1968
Accession Number
ADA405720

Entities

People

  • Harold E. Sliney
  • Robert L. Johnson

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Aeronautics
  • Ball Bearings
  • Bearings
  • Chromium Alloys
  • Clearances
  • Cobalt Alloys
  • Composite Materials
  • Fluoropolymers
  • Friction
  • High Temperature
  • Lubricants
  • Lubrication
  • Materials Processing
  • Oxides
  • Porous Metals
  • Solid Lubricants
  • Test And Evaluation

Readers

  • Surface Engineering/Surface Coating Technology.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).