用直流电弧等离子法蒸发Co-B非晶合金,以Co-B非晶合金靶材,制备了BN包裹Co和少量CoB合金的纳米颗粒,用高分辨电镜、X-Ray衍射及选区电子衍射和光致发光光谱及红外光谱对其进行了表征.结果表明,所制备的纳米颗粒是一种具有核壳结构的纳米胶囊,尺寸为10-100 nm,核由Co和少量CoB合金组成,壳是厚度为3～5 am的BN;Co/CoB作为催化剂在蒸发时促使B与N反应,生成BN包覆在其表面形成纳米胶囊.壳核结构能防止纳米Co颗粒的氧化和团聚.这种纳米胶囊的饱和磁化强度为63.16 Am2/kg,矫顽力为23.16 kA/m.其矫顽力比相应的块体材料提高的主要原因,是颗粒尺寸变小和多畴粒子畴壁的钉扎作用.
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