Accession Number : ADA266653


Title :   Solid Lubricants for Space Structures


Descriptive Note : Final rept. 29 Jun 90-28 Jun 93,


Corporate Author : MATERIALS MODIFICATION INC FAIRFAX VA


Personal Author(s) : Sudarshan, T S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a266653.pdf


Report Date : 17 Apr 1993


Pagination or Media Count : 101


Abstract : In this Phase II effort, copper-lead alloys of three different compositions (90-10, 75/25, and 50/50 copper-lead) were processed by swirl die continuous casting in the form of ingots and further processed into powders using the gas atomization method. The powders were compacted using shock compaction and hot isostatic pressing. Friction and wear studies revealed that the 75/25 alloys had the best friction and wear rates under a range of sliding speeds and contact loads. Bearing cages, brushes, bushings and gears were produced from the different compositions and processing conditions. The components were tested in specially designed test rigs by the National Council for Tribology, U.K.. The 90/10 hot isostatically pressed bearing cages outperformed the currently used lead-bronze cages and produced mini noise for One (1) million revolutions. In the case of brushes, all the compositions and processing conditions outperformed all the materials that had been tested previously at NCT. Moderate to little improvements were observed in gears and bushings.


Descriptors :   *SOLID LUBRICANTS , *TRIBOLOGY , TEST AND EVALUATION , VELOCITY , MATERIALS , PROCESSING , COPPER ALLOYS , NOISE , SLIDING , BRONZE , BEARING CAGES , LEAD ALLOYS , ATOMIZATION , BUSHINGS , GEARS , FRICTION , CASTING , ISOSTATIC PRESSING , ALLOYS , SHOCK , WEAR


Subject Categories : Lubricants and Hydraulic Fluids
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE