化学还原法制备非晶态纳米Co—B合金粉末的研究.pdfVIP

维普资讯 学兔兔 第26卷第2期 粉末冶金技术 Vo1．26，No．2 2008年4月 Powder Metallurgy Technology Apr．2008 化学还原法制备非晶态纳米Co—B合金粉末的研究 袁子洲 陈金妹 陆 叶 (兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室，兰州 730050) 摘 要： 研究了用硼氢化钠还原氯化钴水溶液中的钴离子时反应条件对反应产物的成分和结构的影响。用 化学分析法分析产物的成分；用 x射线衍射、选区电子衍射及差热扫描量热仪确定产物的结构；用透射电子 显微镜观察产物的形貌。试验结果表明：当把硼氢化钠水溶液加入到氯化钴水溶液中时，可成功制备出Co-B 二元非晶态合金纳米粉末；粉末颗粒呈球形，粒径在20—60nm之间，并且团聚成网状；硼氢化钠水溶液的浓 度越高、滴加速度越快以及提高反应温度，合金粉末中的B含量就越高；如果把氯化钴水溶液滴加到硼氢化 钠水溶液中，反应产物中有大量的Co(OH) 晶体颗粒存在，并且反应过程也不易控制。 关键词：Co-B合金；非晶合金；纳米合金粉末；化学还原法 Investigation on preparation of amorphous Co-B binary alloy nano——powder by chemical reduction Yuan Zizhou，Chen Jinmei，Lu Ye (State Key Laboratory of Gansu Advanced Non—ferrous Metal Materials，Lanzhou University of Technology，Lanzhou 730050，China) Abstract：Amorphous Co—B binary alloy nano—powders were successfully prepared by adding an aqueous solution of N~3H4 to an aqueous solution of Co C12·6H2O．The amorphous structure was confirmed by X—ray diffraction， selective area electronic diffraction and differential scanning calorimetry．The surface morphology and the particles size were observed by the transmission electron microscope．The compositions of the prepared powders were determined using chemical analysis．It is found that the powders has a nearly spherical morphology with diameters of 20—60nm and the boron content of the powder increase with increasing the addition rate and concentration of