Accession Number : ADA330279

Title :   Role of Alloying Elements in Adhesive Transfer and Friction of Copper-Base Alloys.

Descriptive Note : Technical paper,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Buckley, Donald H.

PDF Url : ADA330279

Report Date : JUN 1978

Pagination or Media Count : 18

Abstract : Sliding friction experiments were conducted in a vacuum with binary-copper alloy riders sliding against a conventional bearing-steel surface with normal residual oxides present. The binary alloys contained 1 atomic percent of various alloying elements. Auger spectroscopy analysis was used to monitor the adhesive transfer of the copper alloys to the bearing-steel surface. There appears to be a relation between adhesive transfer and the reaction potential and free energy of formation of the alloying element in the copper. The more chemically active the element and the more stable its oxide, the greater is the adhesive transfer and wear of the copper alloy. Transfer occurred in all the alloys except copper-gold after relatively few (25) passes across the steel surface.

Descriptors :   *ADHESION, *COPPER ALLOYS, *STEEL, *FRICTION, VACUUM, SURFACES, OXIDES, BEARINGS, TRANSFER, AUGER ELECTRON SPECTROSCOPY, FREE ENERGY, BINARY ALLOYS, SLIDING FRICTION.

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE