Thermal oxidation of two aviation synthetic lubricant base oils

FEI Yiwei， GUO Feng， YAO Ting， YANG Hongwei， CHENG Zhisheng

（Department of Aviation Oil and Material, China Air Force Logistics College, Xuzhou 221000, China）

Abstract： The thermal degradation of two synthetic lubricants base oils, polyαolefins (PAO) and diesters (DE), was investigated under oxidative pyrolysis condition and their properties were characterized in simulated “areoengine” by comparing the thermal stability and identifying the products of thermal decomposition as a function of exposure temperature. The characterization of the products were performed by means of Fourier transform infrared spectrometry (FTIR), gas chromatography/mass spectrometry (GC/MS) and viscosity experiments. The results show that PAO has the lower thermal stability, being degraded at 200 ℃ different from 300 ℃ for DE. Several byproducts are identified during the thermal degradation of two lubricant base oils. The majority of PAO products consist of alkenes and olefins, while more oxygencontained organic compounds are detected in DE samples based on GC/MS analysis. The related reaction mechanisms are discussed based on the experimental results.

Key words： synthetic aviation lubricant base oils; thermal stability; oxidative pyrolysis; GC/MS analysis; viscosity degradation

CLD number： V317.1   Document code： A

Article ID： 16748042（2015）04039609   doi： 10.3969/j.issn.16748042.2015.04.016

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两种合成航空润滑基础油高温氧化衰变机理研究

费逸伟， 郭峰， 姚婷， 杨宏伟， 程治升

（空军勤务学院 航空油料物资系， 江苏 徐州221000）

摘要: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。

关键词:合成航空润滑基础油； 热安定性； 氧化分解； GC/MS分析； 黏度衰变

引用格式：FEI Yiwei， GUO Feng， YAO Ting， et al. Thermal oxidation of two aviation synthetic lubricant base oils. Journal of Measurement Science and Instrumentation, 2015, 6(4)： 396404. ［doi： 10.3969／j.issn.16748042.2015.04.016］

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