HDDR法生产Sm2Fe17Nx磁粉的关键是获得细小的晶粒.通过XRD,SEM,EDX等手段研究了Sm2Fe17合金粉在脱氢-再化合过程中的相及微观结构的演化规律.结果表明:在真空条件下,650℃时,已经歧化为SmHx和α-Fe 的合金粉的脱氢-再化合开始,先形成非稳定的TbCu7结构的SmFe7相,随着再化合温度的升高,SmFe7相逐渐向稳态相Sm2Fe17转变,在850℃时转变完全;在再化合过程中,合金粉的颗粒大小不发生变化,但内部晶粒已经明显细化;850℃脱氢-再化合1 h,晶粒大小约50 nm.
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