纳米颗粒添加剂对切削油摩擦学性能的影响

Effect of Nanoparticle Additives on Tribological Properties of Cutting Oil

切削油是一种常用的切削润滑介质,在高速、精密和难加工材料切削时,其减摩抗磨性能难以满足需要,添加纳米粒度的固体润滑剂是一种有效的解决方法。采用表面活性剂将石墨、MoS_(2)、WS_(2)、SiO_(2)和Al_(2)O_(3)五种纳米颗粒稳定分散于L-MH46绿色切削油中,并配置成不同种类和浓度的纳米颗粒润滑液,进行不同润滑液下YG6硬质合金和Inconel 718镍基合金的摩擦学试验。对摩擦系数进行测试分析,并利用金相显微镜和白光干涉仪对磨损表面进行表征,研究不同纳米颗粒添加剂对切削油减摩抗磨性能的影响。结果表明:向切削油中加入纳米颗粒添加剂能够有效减小摩擦系数、降低磨损程度和提升摩擦表面质量。其中,15%浓度的MoS2颗粒润滑液具有最好的减摩效果,摩擦系数f可降至0.043,10%浓度的SiO_(2)颗粒润滑液可以获得更稳定的摩擦系数(f=0.052);15%浓度的SiO_(2)颗粒润滑液具有最好的抗磨性能,能够获得最优的磨损表面形貌及最小的磨损宽度(585.44μm)。该研究对于切削润滑介质的发展和应用具有一定的参考价值。

Cutting oil is a kind of common cutting lubrication medium,but its anti-friction and anti-wear properties are difficult to meet the requirements when it is used in high-speed,precision or difficult to machining materials,and adding micro-nano particle size solid lubricant is an effective solution.Graphite,MoS_(2),WS_(2),SiO_(2)and Al_(2)O_(3)nanoparticles are stably dispersed in L-MH46 green cutting oil with surfactants to form different kinds and concentrations of nanoparticle lubricants.Tribological tests on cemented carbide YG6 and nickel-based alloy Inconel 718 are carried out under different lubricants.The friction coefficient is tested and analyzed,and the wear surface is characterized by metallographic microscope and white light interferometer.The effect of different nanoparticle additives on the anti-friction and anti-wear properties of cutting oil is studied.The results show that adding nanoparticle additive to cutting oil can effectively reduce friction coefficient,reduce wear degree and improve friction surface quality.Among them,MoS2 particle lubricant with 15%concentration has the best friction-reducing effect,and the friction coefficient f can reach 0.043.SiO_(2)particle lubricant with 10%concentration can achieve a more stable friction coefficient,the friction coefficient f is 0.052.The optimum wear surface morphology and the minimum wear width of 585.44μm can be obtained by SiO_(2)particle with a concentration of 15%.The research has certain reference value for the development and application of cutting lubrication media.