【作者】 田建军； 张深根； 潘德安；

【Author】 TIAN Jian-jun,ZHANG Shen-gen,PAN De-an (School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

【机构】 北京科技大学新材料技术研究院功能材料研究所；

【摘要】 采用乙二醇和四甘醇,对硝酸钴和氢氧化钴进行还原制备超细钴粉,研究了不同还原剂和前驱物对钴粉形貌、结构、磁性能的影响。研究显示,必须添加NaOH乙二醇才能直接还原硝酸钴获得钴粉,但反应时间长(10h),且粉末颗粒形貌不规则,粒度分布不均匀。由于氢氧化钴是弱氧化剂,较容易还原,获得钴粉颗粒呈球形、分散性好、粒度分布均匀,平均粒径为1μm,磁性能优良:饱和磁化强度最高146.1A·m~2/kg,矫顽力达到6447.6A/m。四甘醇的还原能力远大于乙二醇,在不添加NaOH下直接还原硝酸钴获得分散性好的球形钴颗粒,由于反应温度较高(300℃),颗粒尺寸偏大,平均粒径为2μm。更多还原

【Abstract】 Co ultrafine particles have been prepared by glycol and tetraglycol synthesis using cobalt nitrate and cobalt hydroxide,respectively.The effect of the polyols and precursors on the micro-morphology,structure and magnetic properties of Co particles has been studied in this paper.The results indicate that cobalt nitrate can be reduced to Co particles by glycol with addition of NaOH after 10h at 190～200℃.The micro-morphology is irregularity and the particle size is non-uniform.Co（OH）₂ is easy to reduce by glycol because Co（OH）₂ was weak oxidant.The Co particles by synthesis from Co（OH）₂ is spherical particles with the size of 1μm.It has good dispersivity,uniform particles size and excellent magnetic properties（saturation magnetization is 146.1A·m²/ kg,coercivity is 6447.6A/m ）.The reducibility of tetraglycol is more than that of glycol.Cobalt nitrate can be reduce by tetraglycol without NaOH.Co particles are spheres and has good dispersivity and uniform particles size.But the size of the particles is bigger（2μm） because of high reaction temperature（300℃）.更多还原