磺酸钙/油酸改性碳基二硫化钼的制备及在乳化油中的摩擦学性能

Preparation of Calcium Sulfonate/OA Modified Carbon Based Molybdenum Disulfide and Its Tribological Properties in Emulsified Oil

为了研究MoS_(2)/C复合粉体的改性及其对乳化油润滑性能的影响,以膨胀石墨和MoS_(2)为原料、油酸和高碱值磺酸钙为修饰剂,通过等离子体辅助球磨原位完成粉体的制备及改性,利用扫描电镜、透射电镜、拉曼光谱及红外光谱仪对粉体进行表征。结果表明:等离子体辅助球磨20 h后,在等离子体的热爆协同作用下,膨胀石墨被不断剪切剥离形成了近石墨烯片层结构,部分MoS_(2)被细化为20 nm左右的鳞片状,部分MoS_(2)由于热爆飞溅到石墨层上并冷凝形成石墨烯包覆的球状结构,这些MoS_(2)微粒均匀附着在碳基石墨片层上;同时,在辅助球磨过程中,油酸中的羧基与膨胀石墨和磺酸钙的羟基基团发生酯化反应,完成对粉体的表面改性,粉体具有较大的亲油化度值,并可抑制MoS_(2)/C的氧化。将制备的改性MoS_(2)/C添加在乳化油中进行摩擦学性能测试,发现改性后的MoS_(2)/C沉积吸附在表面磨痕上,同时在摩擦副表面生成一层硫酸/磺酸盐化学膜,有效抑制了水分对MoS_(2)/C减摩自修复性能的影响,使乳化油保持良好的润滑性能。

In order to study the modification of MoS_(2)/C composite powder and its effect on the lubricating performance of emulsified oil,the powder was prepared and modified in situ by plasma assisted ball milling with expanded graphite and MoS_(2) as raw materials,oleic acid and high alkali calcium sulfonate as modifiers.The powder was characterized by scanning electron microscope,transmission electron microscope,Raman spectrum and infrared spectrometer.The results show that after 20 h of plasma assisted ball milling,under the synergistic effect of plasma thermal explosion,the expanded graphite is continuously sheared and peeled off to form a near graphene lamellar structure,part of MoS_(2) is refined into a flake shape of about 20 nm,and part of MoS_(2) splashes onto the graphite layer due to thermal explosion and forms a graphene coated spherical structure due to cold condensation.These MoS_(2) particles are uniformly attached to the carbon based ink lamellar layer.At the same time,during the ball milling process,the carboxyl group in oleic acid reacts with the hydroxyl group of expanded graphite and calcium sulfonate to complete the surface modification of the powder.The powder has a large degree of lipophilicity and can inhibit the oxidation of MoS_(2)/C.The prepared modified MoS_(2)/C was added to the emulsified oil for tribological performance test.It was found that the modified MoS_(2)/C was deposited and adsorbed on the surface wear marks,and a layer of sulfuric acid/sulfonate chemical film was formed on the surface of the friction pair,which effectively suppressed the influence of water on the friction reduction and self-healing performance of MoS_(2)/C and kept the emulsified oil with good lubricating performance.