Abstract

We investigated superparamagnetic nanolubricants and verified the influence of the magnetic field, particle size, and concentration on the tribological performance. The superparamagnetic nanoparticles were synthesized with two different sizes (7 and 15 nm) and dispersed in mineral oil with concentrations of 0.2 and 0.4 wt% The tribological tests were performed using a high-frequency reciprocating rig (HFRR), with and without a constant magnetic field acting in the nanolubricant. The positive effect of the magnetic field on the friction behavior was verified only in the nanolubricant with particles with diameter of 15 nm, at some concentration. In terms of the worn area, the magnetic field promoted a wear reduction for all combinations of size and concentrations. Regarding the wear mechanism, there were fewer grooves on the worn surface and with a smaller depth when the magnetic field was applied to the nanolubricant. For all experimental conditions abrasion was the main wear mechanism.

摘要

我们研究了超顺磁性纳米润滑剂，并验证了磁场，粒度和浓度对摩擦性能的影响。合成了具有两种不同尺寸（7和15 nm）的超顺磁性纳米粒子，并将其分散在浓度为0.2和0.4 wt％的矿物油中。使用高频往复钻机（HFRR）在有和没有恒定磁场的情况下进行了摩擦学测试。在纳米润滑剂中起作用。仅在具有一定浓度的直径为15 nm的纳米润滑剂中，证明了磁场对摩擦行为的积极影响。就磨损面积而言，磁场有助于减小尺寸和浓度的所有组合的磨损。关于磨损机理，当磁场施加到纳米润滑剂上时，磨损表面上的凹槽更少，深度更小。在所有实验条件下，磨损都是主要的磨损机理。