"Aging behavior of fluororubber with high fluorine content in aviation lubricating oil"

Abstract

High fluorine content fluororubber (FKM) was used as the research object, the high temperature medium resistance of high fluorine content FKM vulcanizates in a variety of aero-engine lubricanting oils was investigated, and the changes in physical and mechanical properties of high fluorine content FKM vulcanizates caused by different types of lubricanting oils were studied. The results showed that the high fluorine content FKM vulcanizates could still maintain good compression resilience after aging in lubricating oil at 200 ℃ for 72 h, the volume change rate was lower than 12%, the mechanical properties declined slightly, and the Shore A hardness decreased significantly. The mechanical pro-perty attenuation and volume change rate of high fluorine content FKM vulcanizate were different for different kinds of oil. The corrosion of lubricating oil on high fluorine content FKM vulcanizate at high temperature included physical infiltration and che-mical corrosion.

Keywords

• fluororubber， aero-engine lubrica-ting oil， thermal aging resistance of lubricating oil， hot air aging resistance， physical and mechanical property， volume change rate，