Accession Number : AD0800015

Title :   THE SLIDING BEHAVIORS OF ELECTROPLATED GOLD ON STEEL SURFACES.

Descriptive Note : Technical rept. Jan-Dec 65,

Corporate Author : AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH

Personal Author(s) : Takagi, Riitsu ; Liu, Tung

Report Date : JUL 1966

Pagination or Media Count : 27

Abstract : The friction and wear of gold plated steel surfaces was investigated by means of the repeated sliding of spherical rider on a gold plated flat specimen at a slow speed of 0.17 mm/sec and a load range of 200 - 2000 grams.440C stainless and 52100 steels were selected both as rider and substrate materials. A commercial electroplating process was used to deposit gold films to a thickness range 0.1 to 10 microns. The friction coefficient obtained with a 440C stainless steel rider rapidly arrives at a steady value of 0.1 to 0.3. No film breakdown was observed with 440C riders. When a 52100 steel rider was used, the friction coefficient varied widely over the range of 0.1 to 0.6. Three basic types of friction versus number traverses curves were observed: (a) slowly decreasing friction with thick film and low load, (b) rapidly decreasing friction, and (c) increasing friction with thin film and high loads. The lowest theoretical friction coefficient of 0.1 was only obtained with Type B curves while film breakdown was always accompanied by a Type C curve. Gold plated 52100 steel flats generally led to less friction than the corresponding 440C stainless steel flats, the difference is not nearly as marked as the difference in rider material. (Author)

Descriptors :   *METAL FILMS), *GOLD), (*LUBRICANTS, (*WEAR RESISTANCE, STAINLESS STEEL, SUBSTRATES, HIGH TEMPERATURE, LIFE EXPECTANCY, FRICTION, EFFECTIVENESS, VACUUM APPARATUS, VAPOR PLATING, HARDENING, BEARINGS.

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE