航空煤油泵轴尾机械密封副材料特性

为选择适合在航空煤油介质中工作的机械密封副材料,对材料的摩擦特性进行了研究,利用摩擦磨损试验机得到不同工况条件与表面粗糙度下材料的摩擦因数、温升,在原子力显微镜(AFM)下对3组典型配对材料的微观磨损形貌进行观测,分析磨粒磨损和黏着磨损的行为差异,计算磨损的关键参数。研究发现:聚四氟乙烯（PTFE)在既定条件下为性能最佳的软材料；硬材料表面粗糙度值为0.05时的摩擦性能最佳,不同硬材料间性能差异不大。研究发现PTFE在配磨材料上产生的犁沟效应最轻微,黏附的元素颗粒最少；黏着磨损会造成表面高度分布函数的偏移,利用离散化求解公式得到了黏着体积与平均黏着厚度。 

Material characteristics of mechanical seal in shaft end of aviation kerosene pump

In order to select the mechanical seal materials suitable for working in aviation kerosene, the frictional characteristics of these materials were studied. Through the friction-wear tester, the friction coefficients and the temperature rise of materials were obtained under different working conditions and surface roughness. The microscopic wear morphology was observed for three groups of typical matching materials under the atomic force microscope(AFM). The differences between abrasive wear and adhesive wear were analyzed, and the key parameters of wears were calculated. It found that, when the conditions were set, polytetrafluoroethylene (PTFE) was the best soft material, and the hard materials got the best friction performance when their surface roughness equaled 0.05. Besides, different materials had few differences in their performance. It also found that PTFE caused the least amount of element migration on hard surface which, in turn, caused the smallest single abrasive grain grooves. The adhesive wear caused the migration of surface height distribution function. In addition, the adhesive volume and average adhesive thickness were inferred by discretization solving formula.