点接触方式纳米锌润滑添加剂自修复规律的研究

Self-repairing Rule of Lubricant with Nano-zinc as an Additive under Point Contact

本文采用四球试验法,以含纳米锌自修复剂的基础油为润滑介质,运用均匀设计试验方法对磨损的钢球进行在线自修复试验,建立并验证回归模型,对影响自修复效果的因素量化排序.选择不同修复效果的试验条件,分别加入抗氧抗腐剂T202和空白试验研究点接触方式下自修复过程特点.用带能谱仪的扫描电镜对修复后钢球磨斑表面进行表征.结果表明:试验验证结果与预测值符合较好,说明回归模型可行、可信.纳米锌自修复剂能对磨损的钢球表面进行修复,向表层基体元素扩散并牢固结合,使磨斑直径减小,具有自修复特点.

Four-ball tests were performed to evaluate the on-line self-repairing ability of lubricant with nano-zinc as an additive to the worn steel ball.A mathematical model was established and assessed by a uniform design method,and the impact factors of self-repairing effect were quantified.The contrast test and blank test were designed and conducted to evaluate the self-repairing ability of nano-zinc as an additive.While the morphologies of the worn steel balls were observed on a scanning electron microscopy（SEM）.It was found that the experimental result and caculated result were in good agreement,and this suggested the validity of the regression formulae.As an additive,nano-zinc showed the characteristic of self-repairing,i.e.,repaired the worn surface of the steel ball,diffused in the contact area,reduced the diameter of worn scar.