氟醚橡胶O形密封圈耐航空发动机润滑油性能的研究

Study on Aeroengine Lubricating Oil Resistance of Fluoroether Elastomer O-ring Seal

选取2种不同氟含量的氟醚橡胶制备标准O形密封圈(24.99 mm×3.53 mm),重点考察2种O形密封圈的物理性能和耐飞马Ⅱ号、长城4050和FDS-655-HTS航空发动机润滑油性能。结果表明:采用较高氟含量的氟醚橡胶(牌号VPL85730)制备的O形密封圈在3种航空发动机润滑油中的性能变化不大,而采用较低氟含量的氟醚橡胶(牌号PL855)制备的O形密封圈仅在飞马Ⅱ号润滑油中的性能保持性较好;当O形密封圈在润滑油中的性能变化较大时,其胶料中炭黑与橡胶基体会发生脱离。

Two kinds of low-temperature fluoroether elastomers with different fluorine mass fractions were selected to prepare standard O-ring seals(24.99 mm×3.53 mm).The physical properties of two O-ring seals and their resistances to Mobil OilⅡ,Great Wall 4050 and FDS-655-HTS aeroengine lubricating oils were studied.The results showed that,the properties of the O-ring seals prepared with the fluoroether elastomer(brand VPL85730)which had a higher fluorine mass fraction had little change in the three kinds of aeroengine lubricants,while O-ring seals prepared with the fluoroether elastomer(brand PL855)which had a lower fluorine mass fraction maintained stable property only in Mobil OilⅡ.When the properties of O-ring seal changed greatly in the aeroengine lubricating oil,a considerable amount of carbon black could separate from the rubber matrix.