第四章、第五章与第六章属于第二部分研究，磁流体推进式微型泵的研制。
Chapter Four, Chapter Five and Chapter Six belong to the second part, Research on the fabrication of DC MHD micropump.
磁流体密封技术具有无磨损、使用寿命长及适用于静动密封的特点，正被广泛应用于石油化工的泵、阀、釜及压缩机等领域。
Magnetic fluid seal is wildly used in pump, valve and kettle of the petroleum and chemical industry because of its low wear and long life.
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