Accession Number : AD0631342

Title :   SURFACE TEMPERATURES AT SLIDING INTERFACES IN VACUA AND METAL ADHESION.

Descriptive Note : Technical documentary rept., 15 Nov 63-15 Feb 64,

Corporate Author : RENSSELAER POLYTECHNIC INST TROY N Y DEPT OF MECHANICS

Personal Author(s) : Ling,F. F.

Report Date : MAR 1964

Pagination or Media Count : 58

Abstract : A friction and wear apparatus is described for use in vacua which has no supporting bearings other than the sliding surfaces whose friction and wear characteristics are to be investigated. The moving specimen is suspended and rotated magnetically, external to a vacuum chamber enclosing the test section. Typical temperature, friction and wear data are shown. Moreover, a mechanism of metal adhesion is postulated and a formula on the coefficient of adhesion derived. The experimental equipment to confirm the validity of the theory, at least phenomenologically, is described. The experimental equipment permits loading of predetermined amounts under varied temperatures and durations in vacua; the force of separation is then measured. The simple theory indicates the parameters of the problem: contact load, duration of loading, temperature at the interface, and 'cleanliness' of the interface. The last item is measured through two quantities: (a) a reduced activation energy; and (b) a reduced time exponent of the process. The relationship between adhesion and friction is discussed. (Author)

Descriptors :   (*FRICTION, SURFACE TEMPERATURE), (*ADHESION, SURFACE TEMPERATURE), (*TEST EQUIPMENT, FRICTION), VACUUM, MAGNETIC FIELDS, LOADS(FORCES), HEAT OF ACTIVATION, WEAR RESISTANCE, THEORY, WELDING, METALS

Subject Categories : Test Facilities, Equipment and Methods
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE