点接触方式纳米锌润滑添加剂自修复规律的研究

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.

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

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.