The Preparation and Nature of Surface Films from Zinc Dialkyldithiophosphate
| Autor: | R. C. Coy, R. J. Bird, J. F. Hutton |
|---|---|
| Rok vydání: | 1980 |
| Předmět: |
chemistry.chemical_classification
Materials science Sulfide Plane (geometry) Mechanical Engineering Metallurgy General Engineering chemistry.chemical_element Surfaces and Interfaces Zinc Block (periodic table) Surface film Surfaces Coatings and Films Ferrous Thiophosphate chemistry.chemical_compound chemistry Mechanics of Materials Composite material Lubricant |
| Zdroj: | A S L E Transactions. 23:121-130 |
| ISSN: | 0569-8197 |
| Popis: | An Amsler wear-testing machine has been modified to accept mechanisms by which the nominal line-contact between a rotating disk and a stationary flat plane can be traversed slowly along the plane. Lubricant reaction films formed at the contact are thus made available over an area of about 9 × 6 mm2. It has been found that the most uniform films are produced by maintaining a constant coefficient of friction during the traverse. Running-in of the disk is also beneficial. More extensive coverage is obtained by repeating the traverse over a given block. At least two types of film are produced with zinc dialkyldithiophosphates (ZDTPs): a thiophosphate film and a ferrous sulfide film. The latter is associated with localised high-wear score marks. Most films appear to be patchy. Thiophosphate film formed from s-butyl ZDTP additive comprises patches separated by almost bare metal whereas the film from n-butyl ZDTP is more continuous. The results are discussed in relation to the interpretation of analytical and ph... |
| Databáze: | OpenAIRE |
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