铁磁流体密封在六十年代以前就提出来了,当时由于没有制造出用于密封的长寿命铁磁流体而告失败。七十年代初期,美国铁磁流体公司成功地研制了转轴的铁磁流体密封,并在商业上提供这类密封系列。他们的成功关键在于研制出了适用不同条件下的长寿命密封铁磁流体。本文主要介绍我们研制出来的密封用铁磁流体的制造方法、性能及其实验结果。 Ferromagnetic fluid seals were proposed before the 1960s when they failed because they did not produce long-lived ferrofluids for sealing. In the early 1970s, Ferrofluidics Inc. successfully developed ferrofluid seals for the shaft and offered this type of seal commercially. The key to their success lies in the development of a long life sealed ferrofluid for different conditions. This paper mainly introduces the manufacturing method, performance and experimental results of ferrofluid we developed.