油酸修饰铜纳米颗粒的摩擦学性能

在无水乙醇-十六烷基三甲基溴化铵(CTAB)水溶液混合体系中使用液相还原法制备了油酸修饰铜纳米颗粒.使用透射电子显微镜(TEM)对其形貌进行了表征,结果表明:油酸修饰铜纳米颗粒的粒径大小约为20 nm.用FALEX-6型四球试验机考察了其作为润滑油添加剂在液体石蜡中的抗磨减摩性能,结果表明:当添加纳米颗粒的质量分数为0.2%时就能明显降低摩擦系数,当添加纳米颗粒的质量分数为0.4%时摩擦系数下降至最低值,但当进一步增加浓度至1.0%时,摩擦系数开始有较大的增加趋势.用扫描电子显微镜(SEM)对摩擦表面进行观察,结果表明:当添加纳米颗粒的质量分数为0.4%时磨斑直径(WSD)为最小值,抗磨效果最好.

Tribological Investigation of Oleic Acid Modified Copper Nanoparticles

Oleic acid modified Cu nanoparticles were prepared by means of a redox surface modification technique in an absolute alcohol-cetyltrimethyl ammonium bromide(CTAB) mixed solution.The morphology of oleic acid modified Cu nanoparticles was characterized by transmission electron microscopy(TEM).TEM image confirmed that the average diameter of the oleic acid modified Cu nanoparticles was about 20 nm.The friction reduction and antiwear behaviors of the prepared oleic acid modified Cu nanoparticles as oil additives in liquid paraffin were evaluated with FALEX-6 model four-ball wear tester.Friction test showed that oleic acid modified Cu nanoparticles as oil additives in liquid paraffin were capable of reducing the friction coefficient even at an extremely low concentration about 0.2%.When concentration was about 0.4%,the friction coefficient got to the lowest point.When concentration was up to 1.0%,friction coefficient began to increase dramatically.The scanning electron microscope(SEM)image showed that when additive concentration was 0.4%,wear scar diameter(WSD) was up to the lowest point and the antiwear ability was the best.