Nagoya University · Materials Science
Professor Woo-Young Lee's research lab specializes in the development and tribological characterization of advanced carbon-based coatings, particularly diamond-like carbon (DLC) and tetrahedral amorphous carbon (ta-C). The lab focuses on enhancing the wear resistance, friction reduction, and thermal stability of these coatings under varying environmental conditions such as temperature, humidity, and atmospheric composition. Key research directions include optimizing deposition parameters—such as substrate bias and plasma energy—to control sp3/sp2 bonding ratios and improve coating performance. The lab also investigates transfer layer formation and environmental sensitivity to enable durable, high-performance coatings for automotive, aerospace, and precision engineering applications.
Figures are computed from collected data and may differ slightly.
The anti-friction of diamond-like carbon (DLC) is achieved by a well-developed carbonaceous transfer layer, and Ti-doped DLC is developed into a robustly built-up carbonaceous transfer layer. The friction performance of DLC depends on the operating environment, e.g., ambient gas, humidity, temperature, lubricants, and mating material. In this study, we aimed to reveal the environmental sensitivities of Ti-DLC on friction characteristics. To this end, a Ti-DLC was rubbed against a steel ball, and
In this paper, the tribological behaviors of 1 μm of tetrahedral amorphous carbon (ta-C) coatings deposited with a different substrate bias of -0 V, -100 V and -300 V are examined under elevated temperature up to 600°C. It is found that wear behavior could be divided into two distinct regions according to testing temperature. The variation trend of the specific wear rate of ta-C coatings in region I at 23, 100 and 200°C are affected by abrasive particles which coincide with sp3 content of ta-C c
Abstract Diamond like-carbon (DLC) coatings is a form of amorphous consisting of sp2-bonded and sp3-bonded phase. Among the DLC series, DLC coatings containing a large percentage of sp3 ratio, referred as tetrahedral amorphous carbon (ta-C) coatings, have attracted significant attention as protective coatings in various fields such as tribological applications and automobile components that demand superior durability, chemical inertness and low friction at high temperature. Particularly, the fil
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