选择高岭土和纳米二氧化硅为触变剂,考察了触变剂类型及含量对硅油基磁流变液的摩擦磨损性能的影响,记录了摩擦系数随时间的变化曲线,测量了磨斑直径,采用SEM观察了磨斑的表面形貌,分析了磨损机理。结果表明,纳米二氧化硅在磁流变液中的抗磨性能优于高岭土。随着二氧化硅含量的增加,磁流变液的润滑性能变差,而磁流变液的抗磨性能在二氧化硅含量为1%时出现最佳值。硅油基磁流变液的磨损机理为三体磨粒磨损,触变剂的加入对磁流变液的磨损形式没有影响,但改善了磨损环境。
The influence of the types and content of thixotropies on tribological properties of methyl silicon oilbased magnetorheological （MR） fluids were investigated on a four-ball tribological tester. The effect of thixot- ropy on friction coefficient and wear scar diameter was discussed. And the morphologies of the wear steel surfaces lubricated with MR fluids were observed by a scanning electron microscope. It was found that the wear properties of SiO2-based MR fluids were better than that based on kaolin. The friction coefficient of MR fluid increased with the increase of SiO2 contents. The lowest wear scar diameter could be obtained when the weight percentage of SiO2 was 1%. The wear mechanism of methyl silicon oil-based MR fluids was three body abrasions, the thixotropies did not affect the wear patterns, but they could improve wear performance of the MR fluid.
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