氟醚与丁腈橡胶在航空液压油中的老化行为对比研究

 以氟醚 FM-1D橡胶为研究对象,在高温的 15号航空液压油中进行了老化,对老化后的拉伸强度、拉断伸长率、压缩永久变形、质量变化、体积变化、表面及断口形貌等进行了研究,并与丁腈橡胶进行了对比。结果表明,氟醚橡胶具有优异的耐热空气及耐介质老化性能,其拉伸强度、拉断伸长率、压缩永久变形在170℃以下的液压油介质中长期老化后保持稳定,耐热性能基本保持不变,氟醚橡胶在液压油中的质量和体积变化随温度升高而增加,随时间的延长保持稳定,在质量、体积变化及稳定性方面优于丁腈橡胶胶料。另外,长时间老化过程中其压缩永久变形退化规律基本符合指数的衰减规律,但拉伸性能的退化规律则明显不符合指数的衰减规律,拉伸性能老化速度常数随温度的变化不适合采用常用的Arrhenius方程（P=Ae^-Kt）来进行寿命预测。

Comparative study on aging behaviors of fluorane and nitrile butadiene rubbers in aviation hydraulic oil

Fluoroether rubber is usually used as a sealing material in high temperature oil environment. In this study, FM-1D fluoroether rubber is the research object and is aged at high temperature in No. 15 aviation hydraulic oil. Its tensile strength, elongation at break, compression permanent deformation, mass change, volume change, surface and fracture morphology after aging are studied and compared with those of nitrile butadiene rubber. The results are as follows. Fluoroether rubber has excellent aging resistance to aviation hydraulic oil medium. Its tensile strength, elongation at break and compression permanent deformation may keep stable after aging in the hydraulic oil medium below 170℃. Its heat resistance basically remains unchanged. Changes of mass and volume of fluoroether rubber in hydraulic oil increase with increase of temperature and keep stable over time. It is better than the nitrile butadiene rubber compound in terms of mass, volume changes and stability. In the aging process of fluoroether rubber, degradation of compression permanent deformation basically conforms to the exponential decay law, but degradation of tensile property obviously does not conform to that law, and model Arrhenius (P=Ae^-Kt) equation does not apply to life prediction either.