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- W2022794037 abstract "Direct-reduced (DR) Nd15Fe77B8 and Nd15Fe77 - xB8Gax powders with x = 0.5, 1, 2 and 4, were treated by the HDDR process at various temperatures in order to optimise the processing parameters. The investigation of the magnetic properties was carried out on wax-bonded samples on a vibrating sample magnetometer (VSM) and polymer-bonded magnets on a permeameter. The influence of Ga additions on the microstructure of direct-reduced NdFe B-type material was investigated by means of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It was found that the direct-reduced NdFeB powders containing Ga additions show significantly increased intrinsic coercivities of up to 895 kAm−1 compared to those of the ternary alloy or those of direct-reduced powders with Zr additions. The remanence appears to be, for Nd15Fe77 - xB8Gax, with x = 0.5, 1 and 2, relatively constant over a processing temperature range of ∼50°C; with remanence values of up to 720 mT. The maximum remanence values decrease with increasing Ga content. Under the conditions employed in these experiments, the HDDR treatment removes existing anisotropy in the as-received coarse grain material, thus leading to predominantly isotropic behaviour." @default.
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- W2022794037 date "1997-05-01" @default.
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- W2022794037 title "HDDR processing of direct-reduced Nd15Fe77-B8Ga powders" @default.
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