摘要
密封级氟橡胶F275通常是在高温油液环境下使用的密封材料。本研究以密封级氟橡胶F275为研究对象,分别在150℃的RP-3航空煤油和HP-8B航空润滑油介质中连续浸泡90 d,通过观察氟橡胶F275在不同时间的表面形貌及拉伸断口形貌,分析油液对其微观组织的影响;通过测试氟橡胶F275的拉伸强度、断裂伸长率及压缩永久变形,分析研究力学性能变化情况;采用TG、DSC分析方法,研究氟橡胶F275热性能变化。研究表明:试验前30 d,氟橡胶的力学性能变化幅度较大、而30 d之后力学性能变化幅度变缓并趋于稳定,试验90 d后,在RP-3和HP-8B两种介质中拉伸强度由18.26 MPa下降到12.86 MPa和13.49 MPa,断裂伸长率由185.66%下降到147.10%和169.70%;在试验60 d时氟橡胶表面有不同程度的溶胀,表面出现喷霜和凹坑;在90 d的试验期间,氟橡胶的耐热性能保持不变。
The seals made from fluoroelastomer F275 usually work in high temperature oil medium. This experiment conducted the aging test of F275 in 150 ℃ RP- 3 aviation kerosene and HP- 8B aviation lubricant oil medium within 90 days. Morphology and tension fracture morphology were used to analyze the microstructure. The tensile strength,elongation at break and the compression were investigated to analyze the mechanical properties,thermo gravimetric and differential scanning calorimeter were used to characterize the thermal property changes of F275. The results showed that the mechanical properties decreased greatly at the early 30 days. The change trend was slower and the mechanical properties almost unchanged since aged 30 days. After 90 days,the tensile strength decreased from 18. 26 MPa to 12. 86 MPa and 13. 49 MPa in RP- 3 and HP- 8B oil medium,the elongation at break decreased from 185. 66% to 147. 10% and 169. 70%. The surface of F275 appeared swelling,blooming and appear holes after aging for 60 days. The thermal property of F275 keep stability within 90 days.
出处
《失效分析与预防》
2015年第4期212-216,共5页
Failure Analysis and Prevention
基金
中航工业产学研项目(cxy2013CH18)
关键词
密封级氟橡胶
航空油液
力学性能
微观形貌
seal-grade fluoroelastomer
oil medium
mechanical properties
morphology
