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OALib Journal期刊
ISSN: 2333-9721
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bn包覆co纳米胶囊的制备和性能
Keywords: 无机非金属材料,电弧法,纳米胶囊
Abstract:
？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10-100nm,核由co和少量cob合金组成,壳是厚度为3-5nm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63.16am2/kg,矫顽力为23.16ka/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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