Effect of Contact Lubricant on Contact Resistance Characteristics — Contact Resistance of Lubricated Surface and Observation of Lubricant Molecules —

Terutaka TAMAI  Masahiro YAMAKAWA  Yuta NAKAMURA  

IEICE TRANSACTIONS on Electronics   Vol.E99-C   No.9   pp.985-991
Publication Date: 2016/09/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E99.C.985
Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electro-Mechanical Devices)
contact lubricant,  contact resistance,  surface asperity,  ellipsometry,  contact lubricants,  

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The electrical lubricants have been accepted to reduce friction of contacts and to prevent degradation of contact resistance. However, as the lubricant has an electrical insulation property it seems that application to contact surface is unsuitable for contact resistance. These mechanisms in contact interfaces have not fully understood. In this paper, relationships between contact resistance and contact load were examined with both clean and lubricated surfaces. Orientation of the lubricant molecules was observed by high magnification images of STM and AFM. There was no difference in contact resistance characteristics for both clean and lubricated surfaces in spite of lubricants thickness. The molecules were orientated perpendicular to the surface. This fact turns over an established theory of adsorption of non-polar lubricant to surface.