Fe_(3)O_(4)@CuO磁流体的制备和边界润滑性能

Preparation and Boundary Lubrication Performance of Fe_(3)O_(4)@CuO Magnetic Fluid

采用化学共沉淀法合成了纳米Fe_(3)O_(4)和纳米Fe_(3)O_(4)@CuO粒子。采用场发射透射电镜(FETEM)、X射线衍射仪(XRD)、振动样品磁强计(VSM)和傅里叶变换红外光谱仪(FTIR)对纳米粒子进行表征。采用表面活性剂法制备了不同粒子含量的PAO3磁流体。利用磁流体对外加磁场的响应特性和紫外分光光度计对磁流体分散性进行了表征。采用摩擦副为12CrNi4A和Si_(3)N_(4)的UMT-3往复摩擦磨损试验机对磁流体的摩擦学性能进行了评估。摩擦实验结果表明,含纳米Fe_(3)O_(4)粒子的PAO3基磁流体的润滑效果比较差。而质量分数为1%的纳米PAO3基Fe_(3)O_(4)@CuO粒子磁流体润滑时的摩擦系数相比于PAO3油润滑降低了29.6%,磨痕宽度降低了49.6%。从磨痕表面分析来看,这得益于CuO的摩擦烧结作用,在摩擦表面形成了有效的摩擦膜并修复磨损表面。

Nano Fe_(3)O_(4) particles and nano Fe_(3)O_(4)CuO particles were synthesized by chemical coprecipitation. The nanoparticles were characterized by field emission transmission electron microscopy (FETEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and fourier transform infrared spectrometer (FTIR). Polyalphaolefin (PAO) 3 magnetic fluids with different particle contents were prepared by surfactant method. The magnetic fluid was characterized by some changes of magnetic field and ultraviolet spectrophotometer. The friction and wear tester is UMT-3. The friction pairs are 12CrNi4A and Si_(3)N_(4). The experimental results show that the addition of nano Fe_(3)O_(4) increases the friction and wear. Compared with PAO3 oil, the friction coefficient of PAO3 based magnetic fluid lubricated with nano Fe_(3)O_(4) and CuO composite nanoparticles is reduced by 29.6% and the wear scar width is reduced by 49.6%. From the analysis of wear mark surface, this is due to the friction sintering effect of CuO, and an effective friction film is formed on the friction surface to repair the wear surface.