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RESEARCH PAPERS

Mechanism of Lubrication by Surrounding Gas Molecules in Adhesive Wear

[+] Author and Article Information
Norimune Soda

Institute of Physical and Chemical Research, Hirosawa, Wako-shi, Saitama, Japan

Tadashi Sasada

Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, Japan

J. of Lubrication Tech 100(4), 492-499 (Oct 01, 1978) (8 pages) doi:10.1115/1.3453261 History: Received May 12, 1978; Online October 20, 2010

Abstract

To explain quantitatively the lubricating effect of gas molecules on adhesive wear, the authors have introduced a new concept of mean free time of a small contact point. When a bridge formed between two contact points is sheared off and a small clean surface is exposed to surrounding gases, it must have a free time t until it forms the next bridge when sliding. During this time t, the gas molecules attack the clean spot and can easily form a chemisorbed monolayer when the contact pressure p is low or when the sliding speed v is low. The authors have verified the fundamental relation between the mean free time t and the value pv, and have found that the critical transition point from the mild to severe wear corresponds to the condition where the mean free time of a sheared junction is just enough to be covered by the chemisorbed monolayer of surrounding gas molecules.

Copyright © 1978 by ASME
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