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.
Russian Journal of Applied Chemistry – Springer Journals
Published: Mar 25, 2015
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