中文摘要：

采用改进后的四球试验机考察在有、无磁场作用下150SN基础油和含硫代磷酸铵盐（T307）抗磨添加剂润滑油的摩擦磨损性能，并用扫描电子最微镜（SEM）观察磨斑的表面形貌，分析磁场、载荷和T307的添加量对润滑油摩擦学特性的影响。结果表明：以150SN基础油为润滑介质时，与无磁场作用时相比，磁场作用下的钢球磨斑直径较小、摩擦因数较大，即磁场作用可增强150SN基础油的抗磨性能、削弱其减摩性能；以含T307润滑油为润滑介质时，磁场作用下的钢球磨斑直径和摩擦因数均大于无磁场作用时的磨斑直径和摩擦因数，即磁场作用对含T307润滑油的抗磨性能和减摩性能都有不利影响；磁场作用会影响钢球表面膜的性质和状态，不利于T307与金属表面发生摩擦化学反应形成润滑膜。

英文摘要：

Friction and wear characteristics of 150SN base oil and oils containing ammonium thio- phosphate （T307） were evaluated by an improved four-ball tester with or without magnetic fields. The morphologies of worn surfaces lubricated with tested oils were observed by scanning electron microscope （SEM）, and the effect of the magnetic field, loading and T307 dosage on tribological properties of the oils was analyzed. The results indicate that the wear scar diameters in the magnetic field lubricated with the blank oil are smaller than those in non-magnetic field, the friction coefficients in magnetic field are larger than those without magnetic impact. Furthermore, the wear scar diameters and friction coeffi- cients lubricated with T307-doped oils under the magnetic conditions are larger, indicating the negative effect of magnetic field on tribological performance of formulated oils. The magnetic field has an unfa- vorable effect for the formation of lubrication film on the metal surface through tribochemical reactions between T307 and metal surface.