新型氮磷添加剂对铜箔轧制摩擦学性能与磨损行为的影响

Effect of oil additive containing nitrogen and phosphorus on tribology performance and wear behavior of copper foil during rolling

采用四球摩擦磨损试验机分别考察新型磷系与含氮硼酸酯极压抗磨剂以不同质量分数复配后在铜箔轧制油中的摩擦学特征,利用扫描电子显微镜(SEM)观察磨斑表面形貌,利用能谱分析仪(EDS)分析磨斑表面附着物的组成,并通过冷轧实验研究铜箔轧制摩擦磨损与润滑性能的关系。基于表征润滑性能的最大无卡咬负荷、摩擦因数和磨斑直径3个参数,提出了分析润滑剂摩擦学性能新指标——极压抗磨润滑系数?。结果表明:新型氮磷添加剂在金属表面发生摩擦化学反应形成摩擦化学产物是提高其抗磨减摩性能的根本原因。铜箔与轧辊之间的磨损机制有黏着、犁削和剥离等形式,其中黏着磨损起主导作用;?代替四球测试的结果能较好地解决轧制过程的摩擦磨损问题。

The tribological characteristics of copper foil rolling oil adding a new kind of phosphorus and nitrogen-containing borate acid ester as extreme-pressure and anti-wear additives with different mass fractions of compounded system were investigated using a four-ball friction and wear tester. The surface morphologies of wear scars were observed by scanning electron microscopy （SEM）, and the composition of its surface attachments was analyzed with energy dispersive spectrometer （EDS）. The relationship between friction and wear and the lubricating performances were studied through copper foil rolling experiments. Based on the maximum no-seizer load, friction coefficient and wear scar diameter, a new performance indicator, the extreme pressure anti-wear lubrication coefficient,Ω, is put forward to analyze the lubrication properties of lubricant. The results show that the increase of the wear-resistance and antifriction is mainly attributed to the tribochemical products of the reaction between nitrogen and phosphorus additives on the surface of the metal. The wear mechanisms of copper foil and roll contain adhesive, plowing, peeling and others, in which adhesive wear plays a leading role. Ω is better to solve the problem of friction and wear during rolling instead of the four-ball test results.