| Project/Area Number |
05452147
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
設計工学・機械要素・トライボロジー
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| Research Institution | The Institute of Physical and Chemical Research (RIKEN) |
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Principal Investigator |
MISHINA Hiroshi Riken, Surf.& Interf.Lab., Scientist, 表面界面工学研究室, 先任研究員 (50142641)
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| Co-Investigator(Kenkyū-buntansha) |
KANEKAMA Ungan Riken, Surf.& Interf.Lab., Scientist, 表面界面工学研究室, 先任研究員 (00087454)
KOHNO Akio Riken, Surf.& Interf.Lab., Scientist, 表面界面工学研究室, 先任研究員 (20087456)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 1994: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1993: ¥3,300,000 (Direct Cost: ¥3,300,000)
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| Keywords | Tribology / Ultrafine particle / Friction / Wear / Lubricity |
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| Research Abstract |
Meterials that exist on a frictional surface, from a lubricant to atmospheric gas molecules under dry friction, are an important factor in determining the tribological properties of solid. In this study the friction and wear properties of frictional surfaces with metallic ultrafine particles were examined. The lubricity of the ultrafine particles was explained from the triboligical properties of frictional metal surfaces with Al, Cu, Ni, Fe, or Ag ultrafine particles having a 30-100 nm average diameter. The ultrafine particles showed all types of lubricity on the frictional surfaces, such as a boundary lubricating action, the fluid lubricating action od free particles and solid lubricating action, and the following four types were confirmed.
(1) When ultrafine particles strongly adhere to transferred particles, the production of wear particles is accelerated and wear increases. Lubricity does not appear at this time. (2) When ultrafine particles strongly adhere to the frictional surfaces the ultrafine particles prevent the contact of solids by being present on the frictional surfaces and decrease friction and wear (boundary lubricating action). (3) When ultrafine particles do not adhere to solid surfaces or wear particles, the ultrafine particles prevent solid contact under the conditions where they move freely between the frictional surfaces and decrease wear (fluid lubricating action of free particles). (4) When ultrafine particles greatly adhere to the solid surfaces and form a solid film, they provide a lubricating action through the solid film (solid lubricating action).
The lubricity of ultrafine particles appears in any of the couditions above (2), (3) and (4). The appearance of the four types of actions strongly depends on a combination of frictional materials and ultrafine particle materials.
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