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Abstract
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 physical measurements.
Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference in Minneapolis, Minnesota, October 24–26, 1978
Notes
Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference in Minneapolis, Minnesota, October 24–26, 1978