Coefficient of Friction of PTFE-Impregnated Porous Bronze Versus Temperature

reportActive / Technical Report | Accession Number: ADA040471 | Open PDF

Abstract:

DU registered trademark of the Glacier Medal Company, Ltd. is a composite material consisting of sintered bronze, impregnated primarily with polytetrafluorethylene PTFE, mounted on a steel backing. It is used as a dry lubricant in bushings and for such components as hinges both on the ground and in space. The coefficient of friction in vacuum of DU on hard anodized aluminum coated with the DU was shown to double as the temperature was lowered from 60 to -20C. The expression mu 1.33 exp-0.01092T was derived to describe this behavior. The derivation was made with the expression mu sp as a basis, where s shear strength of PTFE, and p hardness of bronze. The resulting equation or mu fits the data excellently, thereby demonstrating the validity of the adhesion theory of friction for this material.

Author(s):
Fote, Alfred A. ; Wildvank, A. H. ; Slade, Robert A.
Author Organization(s):
AEROSPACE CORP EL SEGUNDO CA IVAN A GETTING LABS
Descriptive Note:
Interim rept.
Pagination:
0023

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-0077(2270-30)-5, SAMSO-TR-77-99
Contract/Grant Number(s):
F04701-76-C-0077
Monitor Series:
TR-77-99, E081-0623, SAMSO
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control
Modernization Areas:
Microelectronics; Directed Energy
Communities of Interest:
Weapons Technologies
Descriptor(s):
*COMPOSITE MATERIALS, *TETRAFLUOROETHYLENE RESINS, *BRONZE, TEMPERATURE, ADHESION, TEST EQUIPMENT, ALUMINUM, COEFFICIENTS, POLYMERIC FILMS, COPPER COMPOUNDS, THERMAL CONDUCTIVITY, SAMPLING, LEAD COMPOUNDS, TIN COMPOUNDS, HARDNESS, ANODIC COATINGS, SINTERING, SLIDING FRICTION, SHEAR STRENGTH, HIGH VACUUM
Field(s)/Group(s):
Laminates and Composite Materials, Metallurgy and Metallography, Plastics
Report Date:
1977 May 11