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Influence of UV irradiation in low frictional performance of CN x coatings
Author(s) -
Tokoroyama Takayuki,
Kamiya Makoto,
Umehara Noritsugu,
Wang Chao,
Diao Dongfeng
Publication year - 2012
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.1168
Subject(s) - materials science , tribometer , irradiation , auger electron spectroscopy , x ray photoelectron spectroscopy , coating , analytical chemistry (journal) , graphite , transmission electron microscopy , scanning electron microscope , ultraviolet , substrate (aquarium) , composite material , friction coefficient , chemical engineering , nanotechnology , chemistry , optoelectronics , physics , oceanography , chromatography , geology , nuclear physics , engineering
The influence of ultraviolet (UV) irradiation on low frictional performance of CN x coatings with 100 nm thickness having nitrogen contents of 9%, 14% and 19% deposited on Si(100) substrate by ion beam mixing was investigated in N 2 atmosphere environment. Three UV lights of 254, 312 and 365 nm were used to irradiate the surface of CN x / Si(100) for 60 min. The changes of N / C ratio and atomic binding energy in the coating were analysed using Auger electron spectroscopy and X‐ray photoelectron spectroscopy, respectively. The friction coefficient of Si 3 N 4 ball sliding against CN x was measured by a pin‐on‐disc tribometer, and wear tracks were analysed by the transmission electron microscope image. The results showed that UV irradiation on CN x coating can decrease the critical frictional cycles for low friction coefficient and that the mechanism is due to the formation of graphite‐like structure in the topmost CN x coating. Copyright © 2012 John Wiley & Sons, Ltd.