Tribo-Electromagnetic Phenomena of Hydrogenated Carbon Films—Tribo-Electrons, -Ions, -Photons, and -Charging

[+] Author and Article Information
Keiji Nakayama

Mechanical Engineering Laboratory, Namiki 1-2, Tsukuba, Ibaraki 305, Japan

Benyebka Bou-Said

Laboratoire de Mecanique des Contacts, Institut National des Sciences Appliquees de Lyon, Batiment 103, 20 Avenue Albert Einstein, 69621 Villeurbanne Cedex France

Hiroshi Ikeda

Tsukuba Research Center, Technical Research Laboratory, Nippon Sheet Glass Co., Ltd., 5-4, Tokodai, Tsukuba, Ibaraki 300-26, Japan

J. Tribol 119(4), 764-768 (Oct 01, 1997) (5 pages) doi:10.1115/1.2833882 History: Received March 19, 1996; Revised August 01, 1996; Online January 24, 2008


Triboemission of negatively charged particles and positively charged particles, tribo-charging and friction coefficient were measured simultaneously using a frictional system with diamond sliding on hydrogenated carbon films in ambient air. The hydrogen content of the carbon films varied from 0 to 43 at. percent. All the carbon films tested emitted both negatively and positively charged particles during sliding. For films with hydrogen content of from 0 to 15 at. percent, neither tribo-charging nor tribo-photons were observed; beyond 15 at. percent hydrogen content, tribo-charging and tribo-photons were observed. With increasing hydrogen content, the emission intensity of the negatively and positively charged particles, photons and tribo-charging increased. It is concluded that a micro-plasma state is formed at the frictional contacts of diamonds sliding on hydrogenated carbon films.

Copyright © 1997 by The American Society of Mechanical Engineers
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