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为研究航空润滑油的热氧化安定性,模拟聚α-烯烃(PAO)和酯类油(DE)两种合成航空润滑基础油在发动机内的高温工况,借助傅里叶红外光谱(FTIR)、气相色谱/质谱(GC/MS)联用等仪器对反应油样的黏度和结构组成进行测试与分析。结果表明,PAO具有较差的热氧化安定性能,在200℃时就发生分解,而DE的分解温度可达到300℃。在两种航空润滑基础油的高温衰变中,均有不同的产物生成。PAO衰变产物主要包括烷烃和烯烃,而DE的衰变产物主要是含氧化合物。最后,根据实验结果分析了航空润滑基础油的高温衰变机理。
In order to study the thermal oxidation stability of aviation lubricating oil, two synthetic aviation lubricating base oils, poly (α-olefin) (PAO) and ester oil (DE), were simulated at high temperature in the engine and analyzed by Fourier transform infrared spectroscopy (FTIR) , Gas chromatography / mass spectrometry (GC / MS) and other instruments on the viscosity and the composition of the reaction oil samples were tested and analyzed. The results show that PAO has poor thermal oxidation stability, decomposes at 200 ℃, and the decomposition temperature of DE reaches 300 ℃. There are different product generations in the high temperature decay of two aviation lubricating base oils. PAO decay products mainly include alkanes and olefins, and DE decay products are mainly oxygenated compounds. Finally, the mechanism of high temperature decay of aviation lubricating base oil is analyzed based on the experimental results.