Abstract
Influence exerted by modification of vermiculite on the tribotechnical characteristics of oil additives was studied. The wear rates were compared for additives containing polytetrafluoroethylene and vermiculite treated with 5–7% hydrochloric acid, followed by modification with polytetrafluoroethylene, and vermiculites modified with chitosan and polyphenylsiloxane. The wear rate was studied in three stages: first (application of an additive), 3 min; second (formation of a coating), 60 min; and third (tribotests), 180 min. Polytetrafluoroethylene and vermiculite modified with polytetrafluoroethylene were compared. It is shown that introduction of polyphenylsiloxane on the vermiculite surface leads to a sharp decrease in the wear rate in the second and third stages. The worn-out oil was analyzed and the formation of a metal-siloxane coating was confirmed. The mechanical and morphological characteristics of the films formed on friction surfaces were studied. The best results were obtained for coatings with an additive containing polyphenylsiloxane.
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