Abstract

This paper presents the results of a study of the effect of the graphite nanoplates (GNP) concentration on the tribological and rheological characteristics of grease lubricants based on used motor oils and calcium soaps. GNP were obtained by the original electrochemical method. Grease lubricants were tested for residual water content, dropping point, penetration, and wear limit. The size of wear spot was determined using a four-ball friction machine. It was found that by GNP content increasing the water content monotonically rises from 0.6 to 2.3 wt. %. The penetration decreases from 44 to 31 mm with increasing GNP content. Also, the dropping point rises from 79 to 88 °C at the GNP concentration of 150 ppm, and then decreases to 81 °C. The minimal size of wear spot (0.215 mm) is also observed at a GNP concentration equal to 150 ppm. It is 25.1% lower than that of the control sample that does not GNP contain.

摘要

本文介绍了石墨纳米板 (GNP) 浓度对基于用过的机油和钙皂的润滑脂的摩擦学和流变学特性影响的研究结果。GNP是通过原始的电化学方法获得的。对润滑脂润滑剂的残留水含量、滴点、渗透和磨损极限进行了测试。使用四球摩擦机确定磨损点的大小。发现随着 GNP 含量的增加，水含量从 0.6 wt 单调上升到 2.3 wt。%。随着 GNP 含量的增加，穿透力从 44 毫米降低到 31 毫米。此外，在 GNP 浓度为 150 ppm 时，滴点从 79 °C 上升到 88 °C，然后下降到 81 °C。在 GNP 浓度等于 150 ppm 时也观察到磨损点的最小尺寸 (0.215 mm)。现在是 25 岁。