Self-Lubrication of Chlorine-Implanted Titanium Nitride Coating |
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Authors: | Tatsuhiko Aizawa Thananan Akhadejdamrong Chihiro Iwamoto Yuichi Ikuhara Atsushi Mitsuo |
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Affiliation: | School of Engineering, University of Tokyo 153-8904, Japan;Tokyo Metropolitan Industrial Technology Research Institute, Tokyo, Japan |
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Abstract: | Chlorine implantation into TiN coatings decreases the wear loss and the friction coefficient. Even by low-dose chlorine implantation, the wear volume is decreased by three orders of magnitude or more, and the friction coefficient becomes <0.1. This self-lubrication mechanism is related to the presence and mobility of implanted chlorine atoms inside the columnar TiN microstructure. According to observations of chlorine-implanted TiN coatings using high-resolution transmission electron microscopy, the chlorine atoms are present in the damaged region, where TiN is composed of nanosized grains. From these data, a self-lubrication mechanism is proposed with chlorine catalyzing the oxidation of titanium and leading to the formation of some tribological reaction product. |
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Keywords: | wear/wear resistance coatings titanium nitride nitrides |
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