纳米WS_2作为润滑油添加剂的分散稳定性及摩擦学性能

Dispersion Stability and Tribological Properties of WS_2 Nanoparticles as Additive in Lubricating Oil

将纳米二硫化钨微粒作为低温切削油CTY-B的添加剂,制备不同质量分数的纳米二硫化钨油样,考察Span-80、十二烷基苯磺酸钠及聚乙二醇6000作为表面活性剂对油样分散稳性能的影响,采用HRS-2M型高速往复摩擦试验机研究纳米二硫化钨对低温切削油CTY-B摩擦学性能的影响,使用扫描电子显微镜观察磨损表面的形貌,利用能谱仪测定磨损表层的元素含量,并对润滑机制进行分析。试验结果显示:Span-80作为表面活性剂对纳米二硫化钨的分散效果最优;纳米二硫化钨能够有效提升低温切削油CTY-B的摩擦学性能,当添加的质量分数为2%时,摩擦因数以及磨痕宽度相比基础油润滑条件下分别降低了24. 8%和16. 4%;在摩擦过程中纳米二硫化钨易沉积在磨损表面的低凹处,形成一层不连续的保护薄膜,从而降低接触面的损伤并起到一定的修复作用。

Nano-tungsten disulfide oil samples with different mass fraction were prepared by using nano-tungsten disulfide particles as additives of cryogenic cutting oil CTY-B.The effects of Span-80,sodium dodecyl benzene sulfonate and PEG-6000 as surfactant on the dispersion stability of the cutting oil were investigated,and the tribological property of nano-tungsten disulfide in CTY-B was evaluated by using a HRS-2M high speed reciprocating tribotester.The micromorphology and element composition of worn surface were characterized by using scanning electron microscopy and energy dispersive spectrometer,and the lubrication mechanism was analyzed.The results show that Span-80 has the best dispersion effect as surfactant on nano-tungsten disulfide particles.Nano-tungsten disulfide as additive can effectively improve the tribological properties of CTY-B,when the mass fraction of nano-tungsten disulfide is 2%,the friction coefficient and wear scar width are reduced by 24.8%and 16.4%respectively compared with the base oil.During the friction process,nano-tungsten disulfide is easy to deposite on the concave surface to form a discontinuous protective film,which can reduce the damage of the contact surface and play a certain role in repairing.