磷酸胺在合成酯航空润滑油中的摩擦学特性

Tribological Characteristics of Amine Phosphate in Synthetic Ester Aviation Lubricant

磷酸三甲酚酯(TCP)与合成酯具有良好的相容性,是合成酯航空润滑油中常用的抗磨剂。但具有极性的合成酯航空润滑油容易与TCP在摩擦表面形成竞争吸附,对抗磨损性能产生不利影响。磷酸胺抗磨剂的分子极性较强(强于TCP),在与合成酯航空润滑油的吸附竞争中可能更具优势,有利于改善合成酯航空润滑油的抗磨损性能,为此对磷酸胺在合成酯航空润滑油(含有3.0%的TCP)中的摩擦学特性进行了考察。在合成酯航空润滑油(含有3.0%的TCP)中添加0.0125%~0.060%的磷酸胺,用四球机和扫描电子显微镜对合成酯航空润滑油(含有3.0%的TCP)的摩擦因数,磨痕直径及磨损表面形貌进行了评价和观察。在不同温度(50℃~150℃)和不同载荷(200 N~600 N)下,合成酯航空润滑油(含有3.0%的TCP)的摩擦因数和磨痕直径均有明显的降低,磨损表面形貌得到改善。磷酸胺可以提高合成酯航空润滑油(含有3.0%的TCP)的减摩抗磨性能,表现出了良好的摩擦学特性。

Tricresyl phosphate(TCP)had good compatibility with synthetic ester,and was a common antiwear agent in synthetic ester aviation lubricants.However,the polar synthetic ester aviation lubricant was easy to form competitive adsorption with TCP on the frictional surface,which had a negative impact on the anti-wear performance.The molecular polarity of amine phosphate anti-wear additive was stronger than that of TCP,and it might have more advantages in the adsorption competition with synthetic ester aviation lubricants,which was beneficial to improve the anti-wear performance of synthetic ester aviation lubricants.Therefore,the tribological characteristics of amine phosphate in synthetic ester aviation lubricant(containing 3.0%TCP)were investigated.0.0125%~0.060%amine phosphate was added into synthetic ester aviation lubricant(containing 3.0%TCP).The frictional coefficient,worn scar diameter and worn surface morphology of synthetic ester aviation lubricant(containing 3.0%TCP)were evaluated and observed by four ball machine and scanning electron microscope.The frictional coefficient and worn scar diameter of synthetic ester aviation lubricant(containing 3.0%TCP)were significantly reduced,and the worn surface morphology was improved at different temperatures(50℃~150℃)and different loads(200 N~600 N).Amine phosphate could improve the antifriction and anti-wear performances of synthetic ester aviation lubricant(containing 3.0%TCP),which showed good tribological characteristics.