Steady-State Wear and Friction in Boundary Lubrication Studies
Abstract
A friction and wear study was made at 20 deg C to obtain improved reproducibility and reliability in boundary lubrication testing. Ester-base and C-ether-base fluids were used to lubricate a pure iron rider in sliding contact with a rotating M-50 steel disk in a friction and wear apparatus. Conditions included loads of 1/2 and 1 kg and sliding velocities of 3.6 to 18.2 m/min in a dry air atmosphere and stepwise time intervals from 1 to 250 min for wear measurements. The wear rate results were compared with those from previous studies where a single 25-min test period was used. Satisfactory test conditions for studying friction and wear in boundary lubrication for this apparatus were found to be 1 kg load; sliding velocities of 7.1 to 9.1 m/min (50 rpm disk speed); and use of a time stepwise test procedure. Highly reproducible "steady-state wear rates" and "steady-state friction coefficients" were determined under boundary conditions. Wear rates and coefficients of friction were constant following initially high values during run-in periods.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1980
- Accession Number
- ADA363018
Entities
People
- William R. Jones Jr.
- William R. Loomis
Organizations
- National Aeronautics and Space Administration