DIFFUSION OF NITROGEN ATOMS DURING PREPARING Sm_2Fe_(17)N_y MAGNETS BY GAS-SOLID REACTION METHOD
气—固相反应法制备Sm2Fe17Ny永磁合金过程中氮原子的扩散

The diffusion behaviour of N atoms in Sm2Fe17 alloys has been studied. The relationship between the diffusion temperature, the diffusion time with average coneentration of N in samples and the distribution of N concentration in powder particle have been measured. The frequency factor D0 and activation energy Q for N atoms diffusion in Sm2Fe17 particle have been calculated. Using Fick second diffusion law the distribution of N concentration in Sm1Fe17 particles and the relationship between the distribution of N concentration with diffusion temperature, diffusion time and particle size are calculated. The calculated results are consistent with experimental results. Correspondent: (ZHOU Shouzeng, professor, State Key Laboratory of Advanced Melallic Materials, University of Science and Technology Beijing, Beijing 100083)