Abstract
Liquid or solid reaction products that are insoluble in the lubricant and the metallic wear debris generated in the wear track are partially deposited around the wear track where they can be easily studied after experiments. A ball-on-plate friction apparatus operating in the mild wear regime is used for investigating these deposits and the wear tracks when dibenzyldisulphide, oleic acid and propionic acid dissolved in white oil are used. To examine the tracks and the deposit around it the optical microscope, the scanning electron microscope and electron probe microanalysis as well as solubility and heat stability tests are used. Dibenzyldisulphide forms high molecular weight compounds which are deposited around the wear track, mainly at the outlet region. A large amount of sulphur was found in the wear track. Oleic acid also forms liquid and solid high molecular weight compounds. In all cases the metal wear debris consists of pellets of about 1 μm size.
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