Effect of Vacuum Degree on Wear

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  • 真空度の摩耗におよぼす影響
  • シンクウド ノ マモウ ニ オヨボス エイキョウ

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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.<BR>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.<BR>The results obtained are as follows:<BR>(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.<BR>(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.<BR>(3) The hardened patches are more effective in the wear resistance than the oxide film at the wear surface.

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