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We studied the magnetic properties of Nd-Dy-Fe-Co-B-Zr-Ga magnet powders produced by the hydrogenation-decomposition-desorption-recombination (HDDR) process, using a hydrogen pressure of 0.1 MPa. Magnet powders with iHC higher than 1200 kA/m were obtained from alloys of Nd11.3Dy1.3Fe80-yCoyB7.0Zr0.1Ga0.3, y≤11.6 at%. It was found that annealing in an Ar atmosphere added after the HD treatment in the HDDR process improved the magnetic anisotropy of the magnet powders. Typical magnetic properties of the magnet powders obtained by this process are as follows: Br=1.27T, iHc=1280 kA/m, (BH)max=283 kJ/m3, and β=-0.44%/°C.
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亮治 et al. (1998) studied this question.
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