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Solid Lubrication with Carbon Onions at High Temperature in Vacuum

Published online by Cambridge University Press:  01 February 2011

Atsushi Hirata
Affiliation:, Tokyo Institute of Technology, Department of Mechanical Sciences and Engineering, 2-12-1 O-okayama, Meguro-ku, Tokyo, 152-8550, Japan, +81-3-5734-2163, +81-3-5734-2893
Shinji Saito
Affiliation:, Tokyo Institute of Technology, Tokyo, 152-8550, Japan
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Solid lubricant properties of carbon onions prepared from diamond nanoparticles through a heat treatment at 1700°C have been examined at high temperatures up to 300°C in air and vacuum. Sliding friction between a silicon disk on which carbon onions were dispersed and a stainless steel ball was measured by means of ball-on-disk type friction testing. Friction coefficients in vacuum decreased with temperatures and became stable above 100°C for longer service lives. On the contrary to this, friction coefficients in air increased with temperatures despite Raman spectroscopic analysis showed that the structure of carbon onions were stable in dry air up to 300°C.

Research Article
Copyright © Materials Research Society 2008

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