In order to understand the solubility of proton in oxides by a new approach using basicity of oxides, the water solubility in ceria and zirconia has been determined by SIMS and FT-IR measurements. From dopant-concentration depending of water solubility, the validity of hydroxyl capacity has been discussed.

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Poly(tetrafl uoroethylene) (PTFE)-blended poly(ether-etherketone) (PEEK)-based materials for bearings was evaluated by ring-on-disc test equipment. The role of PTFE on load carrying capacities was studied from the viewpoint of tribochemistry. The load carrying capacities of PEEK-based materials were improved by the addition of PTFE. The dispersion degree of PTFE in PEEK strongly affected the tribological properties. Time-of-fl ight secondary ion mass spectroscopy and X-ray photoelectron spectroscopy were employed to study the surface chemistry of the rubbed surface. The results indicate that the formation of boundary fi lm composed of PTFE is benefi cial to improve load carrying capacities.

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Diamond-like carbon (DLC) provide very excellence performance in term of friction coefficient and wear resistance under boundary   lubrication. the  nano characteristic of the transformed  layer has not  been studied  in terms  of its  hardness  which is believed to  have a significant  effect in the tribological  performance. This study presented the scratch test of the DLC transformed layer was obtained from the AFM scratch test that governs the friction behavior of DLC. As a result, the hardness of the DLC transformed layer depends on the oil temperature, where the sliding interface of DLC softened during the friction test due to graphitization process