蛇纹石和油酸作为润滑油添加剂的减摩抗磨性能

Friction Reduction and Antiwear Properties of Serpentine and Oleic Acid as Lubricating Oil Additives

利用高能球磨机制备平均粒径约1μm的蛇纹石超细粉体,并将其与油酸按质量比2∶1混合分散到PAO10基础油中,利用四球试验机探究其作为润滑油添加剂的减摩抗磨性能,利用白光干涉仪分析磨斑表面三维形貌,并用EDAX对磨斑表面元素进行分析。结果表明:蛇纹石与油酸混合加入基础油中具有更好的减摩抗磨效果;蛇纹石粉体与油酸混合后能够在摩擦副表面形成含有Si、Mg元素的修复膜,而单一的蛇纹石粉体在摩擦过程中不能成膜,这是因为,油酸作为分散剂能够吸附摩擦过程中产生的金属磨粒并使其分散到润滑油里,减少磨粒对摩擦表面造成的磨粒磨损;油酸有机修饰层吸附到蛇纹石颗粒表面,改善了蛇纹石颗粒在基础油中的分散性。

Ultrafine serpentine powder with average particle size of 1 μm was prepared with high-energy ball-milling method.Serpentine powder was added to the PAOIO base oil with oleic acid according to mass ratio of 2 ： 1.The friction and antiwear properties of the lubricant additives were investigated by four-ball machine, and the three dimensional mor- phology of worn surface was characterized by the White Light Interferometers, and the elements of worn surface were ana- lyzed with EDAX. Results indicate that compared powder and oleic acid can reduce friction and wear to serpentine powder, the compound additives consisted of serpentine more efficiently.A tribofilm is formed on the worn surface with the pres- ence of Si, Mg elements under the compound additives of serpentine powder and oleic acid, while the tribofilm cannot be formed on the worn surface lubricated under the single additive of serpentine powder.It is because that the oleic acid as a dispersant can absorb metal wear particles produced in the friction process, and disperse them into lubricant, so the abra- sive wear is reduced on worn surface.The organic tribofim of oleic acid is absorbed onto the particle surface of serpentine, which improves disperse of the particles in the base oil.