Hydrogen as a working atmosphere for manufacturing permanent magnets based on rare-earth metals |
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Authors: | V V Fedorov I I Bulyk V V Panasyuk |
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Affiliation: | 1.Karpenko Physicomechanical Institute,Ukrainian National Academy of Sciences,Lviv,Ukraine |
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Abstract: | The phase compositions and magnetic properties of permanents magnets of the systems Sm – Co and Nd – Fe – B are analyzed.
Features of the hydrogenation–disproportionation–desorption–recombination (HDDR) process in the Nd2 Fe14 B intermetallic are considered. Using the Dd – Fe – B system as an example, we assess stages of manufacture of commercial
permanent magnets and show the prospect of using hydrogen as a working atmosphere for the manufacture of magnetic powder.
It is established that the HDDR of Dd – Fe – B alloys leads to their homogenization, grain refinement to a grain size of 0.2
to 0.5 μm, and an increase in the volume content of the main ferromagnetic phase Dd2 Fe14 B. By optimizing such a treatment, we managed to increase the magnetic energy (by 10%) and the lift force (by 25 – 27%) of
Dd – Fe – B commercial permanent magnets. |
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