磁性流体在均匀梯度磁场中的摩擦学性能测试研究

摘要

基于均匀梯度磁场能较准确反映出磁场影响磁性流体摩擦性能的认识，制造了一对产生均匀梯度磁场的线圈安置于改造后的 UMT3摩擦试验机中。选用聚α-烯烃合成油基磁性流体为润滑油，测试不同均匀梯度磁场大小、不同载荷和不同往复频率下的磁性流体摩擦学性能。结果显示：载荷、往复运动频率一定时，磁性流体的摩擦系数随均匀梯度磁场的增大而减小；载荷、均匀梯度磁场一定时，磁性流体的摩擦系数随随往复运动频率的增大而减小；磁性流体在均匀梯度磁场中比无磁场中具有更高的承载能力和更长的耐磨寿命。%Uniform gradient magnetic field can,more accurately,reflects the friction performance of ferrofluids in the magnetic field. Based on this,two coils,which could produce uniform gradient magnetic field,were constructed and placed on the commercial UMT3 tribo-meter. Using the poly-α-olefin synthetic oil(PAO)-based magnetic fluids as the lubricant, the tribological properties were tested with different loads,different reciprocating frequency and various magnetic field. The results show that:when the load,reciprocating frequency. The friction coefficient decreased with the increase of the magnetic field;when the load,a uniform gradient magnetic field,The friction coefficient also decreased with the increase of the reciprocating frequency;comparing with no magnetic field,the ferrofluids has higher bearing capacity and a longer wear life in the uniform gradient magnetic field.