Awarded Research Themes and Reports
Note: "Affiliation" in the table is based on the day of grant.
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| Grant Year | Research Theme | Principal Investigator, Co-Investigator (Country) |
Research Content Summary / Related Publication / Main Report |
|---|---|---|---|
| 2014 First |
Thermal stability improvement of ultrathin boundary lubricant films on a DLC film | Prof. Hiroshi Tani (Japan) 14A06 |
Ⅰ. Summary This project focused on: (1) investigate the thermal behavior of friction and wear on the ultrathin perfluoropolyether (PFPE) boundary lubricant film on a diamond-like carbon (DLC) film, (2) to verify the molecular design concept of thermally stable PFPE lubricant films on DLC, and (3) to determine the tribochemical reaction of PFPE lubricant films on DLC at high temperature and propose the PFPE composite film, including the additive, to reduce the tribochemical reaction. As the results, we clarified that (1) the ultra-thin PFPE lubricant film decreased the friction coefficient with the temperature increase until the transition temperature and that increased the friction coefficient over the transition temperature, (2) the transition temperature was affected by the adsorption energy of lubricant molecules to DLC surface, (3) the PFPE molecules with the chemical bonding to DLC surface showed the high transition temperature and the small lubricant depletion by laser heating. Ⅱ. Related Publication (Researcher doesn't agree to disclose main report.) 14A06 Related Publication (HP).pdf Affiliation of Principal Investigator: Kansai University |
| Nanomaterials for tribological applications in the aerospace | Prof. Reshef Tenne (Israel), Prof. Lev Rapoport (Israel) 13B01 |
Ⅰ. Summary In this project we strive to develop new lubrication technology suitable for space applications. The technology is based on new nanoparticles synthesized in the Weizmann Institute laboratory (RT). At the same time a new set-up for tribological measurements in space conditions is mounted in the laboratory of LR at the Holon Institute of Technology. The newly synthesized nanoparticles of MoS2 have fullerene-like (closed cage) structure and are doped by either rhenium or niobium atoms, which makes them negatively or positively charged at their surfaces. The extremely challenging synthesis of these nanoparticles is briefly delineated. The characterization of the nanoparticles and the determination of the doping level (<200 ppm), which was found to be extremely difficult in this case, is briefly mentioned. The new set-up for tribological measurements under vacuum and cryogenic conditions is nearing completion and will be tested and run in the next few months. Ⅱ. Main Report (including Related Publication) 13B01 Main Report (HP).pdf Affiliation of Principal Investigator: Weizmann Institute of Science |
|
| 2014 Second |
New lubrication diagnostic technic with combination of eddy current examination and ultrasonic flaw detection method | Prof. Akitoshi Takeuchi(Japan)
14B01 |
Ⅰ. Summary Rolling or sliding lubrication surfaces tend to be lubricated by the low viscosity oil for high efficiency. In this study, coupled ultrasonic probe with two longitudinal wave transducers for the observation of inlet and outlet in the ball was developed. Echo height in ultrasonic wave reflected from the boundary between outer ring and a ball depends on the bearing load, the formation of lubrication film in inlet and outlet position, and the return delay of lubricant such as oil and grease eliminated by the ball. Additionally, eddy current method was employed. The tendency of eddy current change with average film thickness is similar to the ultrasonic method. However, the eddy current which is proportional to the bearing load is hardly influenced by oil film rupture in contrast to ultrasonic method. Therefore, the potential that combination of the ultrasonic method and the eddy current method becomes reliable lubrication diagnosis method was confirmed. Ⅱ. Related Publication (Researcher doesn't agree to disclose main report.) 14B01 Related Publication (HP).pdf Affiliation of Principal Investigator: Kochi University of Technology |
| Investigation of nanoscale tribological behavior of metallic glasses for micro-electro-mechanical applications | Prof. Louzguine Dmitri(Japan) 14B08 |
Ⅰ. Summary As the surface oxide plays an important role in the nanoscale tribological behavior of metallic glasses the effect of surface oxides on the wear process was studied. An AFM equipped with a single crystal diamond tip was chosen as a tool for studying nanoscale single asperity contact and wear behavior. Various metallic glasses, namely: Al85Yb8Ni5Co2, Fe50Cr15Mo14C15B6, Ni55Zr30Ti10Pd5, Zr50Ti10Cu20Co10Al10, Co48Cr15Mo14C15B6Tm2, Ti43Zr10Cu36Ni9Sn2, Zr62.5Cu22.5Fe5Al10 and Mg65Cu25Gd10 glassy alloys were prepared and tested. Among the metallic glasses with high enough surface quality the Zr62.5Cu22.5Fe5Al10 is the most scratch resistant alloy followed by the Ti43Zr10Cu36Ni9Sn2 and Mg65Cu25Gd10 metallic glasses. Cu47Zr45Al8 ribbon and Zr62Cu22Fe5Al10Gd1 bulk metallic glassy samples were also tested before and after annealing in air. Growth of the surface oxide improves a single-cycle and multi-cycle wear resistance owing to high hardness and protective properties of the oxide. Polished Cu47Zr45Al8 alloy also showed high wear resistance after annealing. Ⅱ. Related Publication (Researcher doesn't agree to disclose main report.) 14B08 Related Publication (HP).pdf Affiliation of Principal Investigator: Tohoku University |