The mechanism of wear of polytetrafluoroethylene above the melting point
| Autor: | Seiichi Ueda, Kyuichiro Tanaka |
|---|---|
| Rok vydání: | 1976 |
| Předmět: |
Range (particle radiation)
Materials science Polytetrafluoroethylene Surfaces and Interfaces Atmospheric temperature range Condensed Matter Physics Surfaces Coatings and Films law.invention Rubbing Mechanism (engineering) chemistry.chemical_compound chemistry Mechanics of Materials law Materials Chemistry Melting point Electron microscope Composite material |
| Zdroj: | Wear. 39:323-333 |
| ISSN: | 0043-1648 |
| DOI: | 10.1016/0043-1648(76)90058-2 |
| Popis: | The effects of temperature and sliding speed on the friction and wear properties of polytetrafluoroethylene (PTFE) were studied over the temperature range 280°–380°C. Friction showed little variation with temperature, whereas an abrupt increase in wear rate occurred at the melting point as the temperature was increased. The changes in friction with sliding speed were similar in the temperature ranges above and below the melting point. The abrupt increase in wear rate occurring at low sliding speeds was relatively small. The wear rate decreased with temperature increase in the range of temperatures above the melting point. The mechanism of wear of PTFE above the melting point is discussed on the basis of an electron microscope examination of the frictional surfaces, and a mechanism using a modified model of the banded structure is proposed. A long film of thickness about 250 A is produced on the frictional surface of the PTFE as a result of destruction of the banded structure during the wear process, and this film transfers to the countersurface, resulting in wear of the PTFE. The modes of formation and transfer of the film are similar to those for the case of rubbing PTFE below the melting point. |
| Databáze: | OpenAIRE |
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