SURFACE TEMPERATURES AT SLIDING INTERFACES IN VACUA AND METAL ADHESION.
Technical documentary rept., 15 Nov 63-15 Feb 64,
RENSSELAER POLYTECHNIC INST TROY N Y DEPT OF MECHANICS
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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
- Test Facilities, Equipment and Methods