No.1006E 2009 Study of Tribology over the Past Twenty Years −Fundamentals and Applications−

Category CONTRIBUTION
Author Professor Koji KATO
Department of Mechanical Engineering, College of Engineering, Nihon University
Abstract The representative research results over the past 20 years at my laboratory are introduced as follows,
(1) Static friction coeffi cient changes by the shape of contact area.
(2) Different wear modes are classifi ed in one diagram as Wear Map by introducing indexes of severity of contact.
(3) Repeated sliding friction at self-mated SiC and Si3N4 in water generates friction coeffi cient below 0.01. Micro texture on contact surfaces generates friction coeffi cient in the order of 0.0001.
(4) Tribo-coating of indium on the surface of SUS440C disk generates friction coeffi cient below 0.05 against Si3N4 pin in high vacuum.
(5) N2 gas supply at the contacts of Si3N4/CNx and CNx/CNx in air generates friction coeffi cient in the order of 0.001.
(6) Tribolayer formed by tribo-chemical reaction changes friction and wear drastically.
Keyword micro-slip, wear map, water lubrication, tribo-coating, N2-gas lubrication, tribolayer
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