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球形颗粒磁性粉末是电磁粉末离合器(一种自动控制元件)传递转矩的工作介质。颗粒直径按离合器工作间隙δ的大小在数微米到数百微米内变化(一般按1/16δ的平均值配比粒度)。磁粉离合器的各种特性与磁粉性能密切相关。磁粉在离合器的连结过渡状态和滑差状态下工作时经受摩擦、高温和氧化的作用,各种性能逐步降低,直至磁粉传递转矩比初始值下降30%而失效,这时必需更换磁粉。对于磁粉失效,据已有报导,可归纳三种观点:一种认为是由磁粉磨损所致,其氧化物系由磨损产物形成;另一种认为是由磁粉氧化所造成或是由氧化和磨损造成;还有一种认为是由磁粉氧化
Spherical particles of magnetic powder is electromagnetic powder clutch (an automatic control element) to transfer torque working medium. Particle diameter according to the size of the clutch working gap δ within a few microns to hundreds of microns change (usually 1 / 16δ ratio of the average size). Various characteristics of magnetic clutch and magnetic properties are closely related. Magnetic powder in the transitional state of the clutch connection and sliding state work under friction, high temperature and oxidation, a variety of performance gradually reduced until the magnetic powder transmission torque than the initial value of 30% of the failure, then the need to replace the magnetic powder. For magnetic powder failure, it has been reported that three kinds of views can be summarized: one is thought to be caused by wear of the magnetic powder, the oxide of which is formed by the wear product, the other is thought to be caused by oxidation of the magnetic powder or oxidation and wear Caused by; there is another that is oxidized by the magnetic powder