Graphite Lubrication in Grey Cast Iron
| Autor: | E. Langer, E. Knuth-Winterfeldt |
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| Rok vydání: | 1954 |
| Předmět: | |
| Zdroj: | Nature. 173:497-498 |
| ISSN: | 1476-4687 0028-0836 |
| DOI: | 10.1038/173497b0 |
| Popis: | DURING work with the Lunn apparatus1 on dry friction between a sliding tungsten carbide ball and a grey cast iron test-piece, two different types of tracks were obtained. The first type of track had a black appearance when examined with the naked eye or in the microscope, and a continuous film of deformed graphite covered the surface of the track. The L value of this film was high, which indicated good electric conductivity of the film. The second type of track had a bright, metallic appearance, and on examination with the microscope very small amounts of deformed graphite were observed. In this case, the L value was low, which indicated the build-up of an insulating film—even if the specific pressure is of the magnitude of 10,000–12,000 lb./sq. in. |
| Databáze: | OpenAIRE |
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