某型号航空润滑油金属催化高温氧化黏温规律的分析

Analysis on the law of viscosity and temperature of a certain aviation lubricant under high temperature oxidation catalyzed by metal

对某型号的航空润滑油经金属催化高温氧化后,温度对黏度的影响规律进行了分析,测定了油样在不同温度下的运动黏度,采用Andreda,Walther,Vogel方程对不同温度下的运动黏度进行了线性拟合分析,并对高温条件下油品黏度衰变的机理进行了探究。实验结果表明,Walther方程拟合的效果最佳,运动黏度预测值与实测值之间的相关系数高达0.984 2。在金属的催化作用下,金属表面吸附了大量高温氧化产生的自由基,增大了有效碰撞的概率,进而加速了油品的氧化,生成了烷烃、烯烃以及醛、酯等小分子类物质,使油品的运动黏度发生衰变。

The law of temperature effecting on the viscosity of a certain aviation lubricant after high temperature oxidation catalyzed by metal was analyzed. The kinematic viscosities of the lubricant samples at different temperature were measured. Subsequently,the linear fitting analysis of these kinematic viscosities was carried out using Andreda,Walther and Vogel equations,and the mechanism of the viscosity decay of the oils under high temperature conditions was explored. The experimental results showed that the Walther equation worked best when fitted,and the correlation coefficient between the predicted and measured kinematic viscosity was as high as 0.984 2. The surface of the metal adsorbed a large number of free radicals generated under high temperature oxidation. The free radicals increased the probability of effective collisions,thereby accelerated the oxidation of oils. Then the oils produced alkanes,olefins,and small molecules such as aldehydes and esters etc.,so kinematic viscosity of the oils decayed.