Abstract
The relation between vacuum degree and wear has been made clear in the range of the low frictional velocity, but that of the high frictional velocity is unknown.This study has been carried out using a specimen of carbon steel in the range of 760∼2×10−5 mmHg. The frictional velocity is 400 rpm (1.63 m/sec) and 1200 rpm (4.89 m/sec), and the normal load is 1 kg.The results obtained are as follows:(1) In the velocity of 400 rpm, the wear loss in the range of 760∼1 mmHg decreases with the increase of vacuum degree. However, it becomes almost constant beyond a certain high vacuum degree.(2) In the velocity of 1200 rpm, a seizure phenomenon was observed on the worn surface of the ring specimen and the wear loss of the rod specimen becomes the maximum at a vacuum of 10−1 mmHg.(3) The hardened patches are more effective in the wear resistance than the oxide film at the wear surface.
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