Friction characteristics of inorganic or organic thin coatings on solid surfaces under water lubrication |
| |
Authors: | Masabumi Masuko Akihito Suzuki Yu Sagae Maiko Tokoro Kenji Yamamoto |
| |
Affiliation: | aDepartment of Chemical Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology, S1-27, 12-1 O-okayama 2-chome, Meguro-ku, Tokyo 152-8552, Japan;bMaterials Research Laboratory, Kobe Steel Ltd., 5-5 Takatsuka-dai Nishi-ku 1-chome, Kobe, Hyogo 651-2271, Japan |
| |
Abstract: | Water has been considered as an alternative working fluid for hydraulic power systems in order to minimize the consumption of fossil fuels and mineral oils. In spite of the many advantages to this use of water, difficult technical problems remain. The key technology for establishing a water hydraulic system is tribology, because water has a lack of lubricity, and thus some coating is needed to protect the metal surfaces from corrosion and frictional wear when using water as a lubricant. It has already been demonstrated that some Si-containing materials have good lubricity in a water environment. Recently, it has been shown that diamond-like carbon (DLC) coatings also have good lubricity with water. In order to clarify the mechanism by which such materials are lubricated with water, and to develop surface coatings that have good lubricity with water, the friction characteristic of several coated metals were investigated in this study. Coatings of CrN, CrSiN, and two types of DLC were applied on an SUS630 stainless steel flat disk substrate. Additive-free distilled water was used as a lubricating fluid. The friction characteristics of these coatings at different sliding speeds were evaluated using a tribometer with two contact configurations in which stainless steel balls and a flat ring without coatings were used as mating specimens.In addition, the lubrication characteristics of organic hydro-gels such as alginic acid or its metal salt were studied by immobilizing them on the surface, and their effects on the lubrication with water were discussed. |
| |
Keywords: | Water lubrication Coatings Nitride coatings DLC coatings Hydro-gel |
本文献已被 ScienceDirect 等数据库收录! |
|