润滑介质对摩擦性能影响差异分析

摘要

L-CKD150润滑油和复合锂基润滑脂广泛运用于石油装备润滑减磨.为研究2种润滑介质对摩擦副摩擦磨损性能及磨损机制的影响差异,采用MMW-1型微机控制立式万能摩擦磨损试验机,开展不同接触压力和线速度及不同润滑环境下摩擦学实验研究.结果表明:实验工况下,销-盘摩擦副表面以磨粒磨损为主,同时存在黏着磨损;相比于L-CKD150润滑工况,复合锂基润滑脂润滑时销-盘表面黏着磨损更为严重,进而加大摩擦因数的波动幅度,最大波动幅度为L-CKD150润滑下的3.7倍;盘试样表面磨粒磨损与接触压力有关,0.5 MPa接触压力下,L-CKD150润滑时磨粒磨损较严重,1.5 MPa下则复合锂基润滑脂润滑时更严重,磨粒磨损是影响盘试样磨损量差异的主要因素.%L-CKD150 lubricant oil and compound lithium lubrication grease are widely used in the lubrication and wear reducing of the oil and gas equipment.To investigate the influence difference of L-CKD150 lubricant oil and compound lithium lubrication grease on tribological properties and wear mechanism of friction pairs,the tribology experiments were carried out under different contact pressure and linear velocity as well as different lubrication condition by using pin-on-disc friction pair of MMW-1 vertical universal tribometer.The results show that under the experimental conditions,the wear mechanism of pin-disc friction surface is mainly abrasive wear,accompanying by adhesive wear.Compared with L-CKD150 lubrication,the adhesive wear of pin-disc surface under compound lithium grease lubrication is more serious,which results in the increasing of the fluctuation amplitude of friction coefficient,and the maximum fluctuation amplitude is 3.7 times of that under L-CKD150 lubrication.The abrasive wear of disc specimen surface is related to the contact pressure,under the contact pressure of 0.5 MPa,the abrasive wear of disc specimen surface is more serious when lubricated by L-CKD150,while under the contact pressure of 1.5 MPa,the abrasive wear is more serious when lubricated by compound lithium grease,and abrasive wear is the main factors to influence the wear loss of pin specimens.