Mechanically alloyed 1:12 nitrides and carbides

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Abstract
Nd10Fe90−yMoyNx(y=8,12,15) nitrides and Nd10Fe75Mo15Cx carbides have been prepared by mechanical alloying. The experimental results show that both Tc and Ms increase from 310 to 355 °C and from 84.5 to 108.8 emu/g, respectively, when the Mo content is reduced from 15 to 8 at. %. However, the coercivity of the lower Mo content Nd10Fe90−yMoyNx compounds is decreased with a value of Hc=4.0–4.5 kOe for y=8. An increase in coercivity by 2–3 kOe was obtained after an addition of 1.5 at. % Dy in the Nd8.5Dy1.5Fe82Mo8Nx compound. Al‐bonded magnets were made with mechanically alloyed powders using Al contents from 5 to 40 wt % and bonding temperatures in the range of 600–680 °C. The coercivity of the bonded magnets was found to increase by about 1–2 kOe. The best results are obtained on a 10 wt % Al sample, bonded at 660 °C with Hc=9.5 kOe. Both the nitrides and carbides had very high coercivities (Hc≳22 kOe) at low temperatures.