Effects of Residual Gas on Tribochemical Reactions of SUJ2 Steel in Vacuum and in Argon Gas Atmosphere

Abstract

To analyze the mechanisms of tribochemical reactions occurring between atmospheric gases and materials induced by friction, the authors have developed a friction test system with integrated XPS. The system can analyze worn surfaces in various environments using XPS without air exposure. The results of friction tests in vacuum showed that the native oxide film that formed on the bare surface was worn by friction in vacuum. The results of the friction tests in an Ar gas atmosphere also showed the same results as the friction tests in vacuum. However, it has been suggested that some tribochemical reactions with trace amounts of residual gas occur during friction tests in an Ar gas atmosphere. The results of the friction tests and XPS analyses indicated that our friction test system with integrated XPS was useful for analyzing tribochemical reactions between atmospheric gases and materials.

Tribological behavior of in situ fabricated graphene–nickel matrix composites

“…It is seen in Fig. 7f that the Fe 2p 3/2 spectrum was deconvoluted into two components centered at 709.7 and 711.0 eV, corresponding to metal FeO and Fe 2 O 3 , 21 which suggests that the worn surface of steel ball is oxidized severely. This is consistent with the O 1s spectra in Fig.…”

Effects of Residual Gases on Tribo-Chemical Reaction of Nickel in Hydrogen Gas Atmosphere

“…In our present study, we analyzed the mechanism of the tribo-chemical reactions of nickel in a hydrogen environment using x-ray photoemission spectroscopy (XPS) combined with a friction test system [23]. This system is capable of analyzing the sliding metal surfaces without exposure to air.…”