【摘要】 利用磁脂密封试验台,研究在海水环境中磁脂从初始状态到稳定运转直至失效的全生命周期的性能变化。采用电镜和差热反应等方法对分散剂、磁性包覆颗粒以及载液的酸值和分油进行分析,研究磁脂的变化过程,得到其变化规律和磁脂失效的判据。结果表明:磁脂的结块硬化是引起磁脂失效的主要原因;磁脂发生结块硬化时,载液的分油加剧,载液承载作用减弱,出现磁性包覆颗粒分散稀疏带并呈现扩展趋势,但磁性颗粒没有发生氧化反应,分散剂形态仍保持良好。更多还原

【Abstract】 The change of full life-cycle performances of magnetic greases from the initial state to the steady state until the dead end in sea-water was investigated by using the magnetic grease seal test bed. By analyzing the dispersant,magnetic coated particles,and the value and oil separation of loading fluid by the methods of SEM,TEM and differential thermal analysis,the change process of magnetic greases was researched to find out the law of change of magnetic greases and the criterion of faults prediction of the magnetic greases. The results show that cross-linking hardening is the main reason to lead to the invalidation of magnetic greases. When the cross-linking hardening happens,the oil separation of loading fluid is increased and the carrying capacity is weakened,magnetic coated particles disperse sparsely and trend to diffusion. But there is no occurrence of oxidation reactions in magnetic particles,and the shape of dispersants is remained in good condition.更多还原