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Friction and wear property of a-CNx coatings sliding against Si3N4 balls in water

Author:
Fei Zhou   Xiaolei Wang   Koji Kato   Zhendong Dai  


Journal:
Wear


Issue Date:
2007


Abstract(summary):

Amorphous carbon nitride coatings (a-CNx) were deposited on Si(100) wafers and Si 3N 4 disks using ion beam assisted deposition (IBAD), and their composition and chemical bonding were determined by X-ray photoelectron spectroscopy (XPS). The a-CN x coatingspsila hardness was measured by nano-indentation and the friction and wear behavior of a-CN x coating sliding against a Si 3N 4 ball in water was investigated. The results indicated that the a-CN x coatings contained 12at.% nitrogen and the major chemical bonding was sp 2 CN and sp 3 C=N. The nano-hardness of the a-CN x coatings was 29GPa. At a sliding velocity of 0.16m/s and after running-in, the mean steady-state friction coefficient varied around 0.02 when the normal load was lower than 3.5N, and then decreased abruptly from 0.018 to 0.007 at 5N. For self-mated Si 3N 4, the specific wear rate of a Si 3N 4 ball was a little higher than that of a Si 3N 4 disk, while for a-CNx/Si 3N 4, the specific wear rate of a Si 3N 4 ball was slightly smaller than that of a-CN x coating. Furthermore, the specific wear rate of Si 3N 4 ball sliding against a-CN x coating was reduced by a factor up to 35 in comparison to that against Si 3N 4 in water. This indicated that the wear mechanism of a-CN x coating/Si 3N 4 ball was the formation of a carbonaceous transfer film on the a-CN x coatings via a tribochemical reaction between a-CN x coatings and water induced by friction, while that of self-mated Si 3N 4 ceramics was the formation of silica gel on the contact zone via the reaction of silicon nitride and water.[All rights reserved Elsevier].


Page:
1253-1258


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