Abstract
Relationships between the coercivity of hydrogenation disproportionation desorption recombination (HDDR) Nd12.5Fe81.5−xCo6Bx bonded magnets and boron content were investigated. Nd2Fe17 phase with planar magnetic anisotropy is present in the microstructure when x= 4at%–5.88at%, which does not reduce the coercivity of the bonded magnets. High-resolution transmission electron microscopy (TEM) images show that Nd2Fe17 phase exists in the form of nanocrystals in the Nd2Fe14B matrix. There is an exchange-coupling interaction between the two phases so that the coercivity of HDDR Nd12.5Fe81.5−xCo6Bx bonded magnets is hardly reduced with a decrease in boron content.
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