Abstract
To clarify the friction durability, both during and after the high-temperature heating of nanometer-thick diamond-like carbon (DLC) films, deposited using filtered cathodic vacuum arc (FCVA) and plasma chemical vapor deposition (P-CVD) methods, the dependence of the friction coefficient on the load and sliding cycles of the DLC films, were evaluated. Cluster-I consisted of a low friction area in which the DLC film was effective, while cluster-II consisted of a high friction area in which the lubricating effect of the DLC film was lost. The friction durability of the films was evaluated by statistical cluster analysis. Extremely thin FCVA-DLC films exhibited an excellent wear resistance at room temperature, but their friction durability was decreased at high temperatures. In contrast, the durability of the P-CVD-DLC films was increased at high temperatures when compared with that observed at room temperature. This inverse dependence on temperature corresponded to the nano-friction results obtained by atomic force microscopy. The decrease in the friction durability of the FCVA-DLC films at high temperatures, was caused by a complex effect of temperature and friction. The tribochemical reaction produced by the P-CVD-DLC films reduced their friction coefficient, increasing their durability at high temperatures.
Highlights
The development of advanced electronic data storage devices has been realized in recent years.In high-density recording magnetic disk drives, diamond-like carbon (DLC) film is usually applied to magnetic recording head-disk interfaces, as a protective film [1,2]
We studied the dependence of the durability of filtered cathodic vacuum arc (FCVA)-DLC and plasma chemical vapor deposition (P-CVD)-DLC films on their thickness, using four kinds of friction tests to evaluate the superior durability of extremely thin FCVA-DLC film at room temperature [24]
The friction force measured at room temperature after the FCVA-DLC film was heated to 200 °C was stable, and gradually increased with the load
Summary
The development of advanced electronic data storage devices has been realized in recent years. It is necessary to clarify the high temperature durability of the extremely thin DLC films used as protective films on HAMR magnetic disks and heads [10,11,12]. In our former studies, the friction coefficient and wear depth of an FCVA-DLC film were found to be initially low, before increasing rapidly at critical load, whereas the values for a P-CVD-DLC film increased gradually under nano scratch tests, even at low load. To clarify the friction durability of extremely thin DLC films at high temperatures, the dependence of the friction properties of DLC films, deposited using the FCVA and P-CVD-DLC methods, on the load and reciprocating cycle number, was evaluated at high temperatures. To clarify the process of DLC degradation caused by sliding, the dependence of the friction coefficient on the load and temperature was analyzed by nano-friction tests, using atomic force microscopy
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
