Research On Preparation And Tribological Performance Of Nanoparticles

In the field of tribolgy,the application of traditional oil -soluble additives of antiwear and reducing friction has been confined due to itself defect. An oil agent has a low load bearing capacity,extreme pressure andantiwear additives often contain the element of sulph,phosphorus,chlorine,which pollute surrouding enviorement,which have been restricted to use overseas.Deweloping lubricating oil additive with good antiwear,high load-bearing capacity and self-repair of wear surface is one of the important questions in tribology.Nano-materials show broad application due to its unique physical and chemical characteristics in the field of tribology,and become potential lubricating oil additives.Despite the present research still in the initial stage,many problems requir to be solved,however,lots of experimental results indicate that nano-materials possess the charateristics of reduing wear,antiwear and extreme pressure resistance.The preparation methods and its tribological characteristics of nanometer particles have been studied in this paper. With the reference of many relevant materials,the author prepared a fined molybdenum disulfide powder with a average size of 800nm by ball milling,and a nano-copper with average size of 30nm in micromulsion solution method,and synthesized surface-modified titanium dioxide nanoparticles with average size of 40nm in organic media via sol-gel method.The tribological performances of three particles were studied by universal test as well,with the result of fined molybdenum disulfide powder with good reducing wear and antiwear performance at low load,nano-copper with good reducing wear and antiwear performance at high load,surface-modified titanium dioxide nanoparticles maintaining stable reducing wear and antiwear performance from low load to high load due to its characteristics of organic and inorganic nanocomposite.The results indicate that the nanocomposite is the most perspective oil additive.The reducing wear and antiwear mechanism of nano oil additive was studied with in-situ tribochemical principle.Nano additives possess broadly developing prospect with its above-mentioned performance.