Preparation of anisotropic Nd(Fe,Mo)12Nx magnetic materials by the strip-casting technique.

Strip-casting technique is used to prepare anisotropic Nd(Fe,Mo)₁₂N_x compounds. It is found that, by this technique, the single-phase Nd(Fe,Mo)₁₂ compounds can be directly obtained without postannealing at a rolling velocity of 3 m/s and with an Fe-to-Mo ratio of 7. Under the same nitrogenation conditions, it is easier to introduce the nitrogen atoms into the strip-cast Nd(Fe,Mo)₁₂ powders than into the conventionally cast powders. The microstructure studies of the ingots show that not only the size of strip cast Nd(Fe,Mo)₁₂ grains is small, but also the size distribution of the grains is narrow as compared with those of conventionally cast ingots. Thus, the strip-casting technique is used to synthesize the anisotropic powders of Nd(Fe,Mo)₁₂N_x with a B_r of 1.10 T, an _iH_c of 448 kA/m, and a (BH)_max of 160 kJ/m³. [ABSTRACT FROM AUTHOR]