Abstract
A friction measurement device has been developed which permits continuous measurement of static and kinetic coefficient of friction at ultrahigh vacuum. Sliding motion inside the vacuum chamber is accomplished by using a disk rotated by a zero-leakage, direct-drive rotary seal. The coefficient of friction is measured using a strain-gauge system which is compatible with the ultrahigh vacuum test environment. An example of the type of results obtained with the device is given. The apparatus has been continuously operated at pressures in the 10−10 Torr region.
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