在脉冲电磁场(PEMF)作用下,以氯化钴为母液、草酸铵为沉淀剂,采用草酸盐沉淀法制备了尺度较小且粒度分布均匀的草酸钴粉体.初步分析了PEMF与草酸钴制备体系的交互作用机理.同时,利用FTIR争电导率实验为机理模型提供了强有力的实验证据.结果表明,施加PEMF条件下获得的沉淀产物为β-CoC2O4·2H2O,其平均粒径为3.5403μm,与未施加PEMF条件下制备的样品相比降低了60.13%.PEMF作用下,反应体系中稳定晶核数量的增加以及形核率的提高是草酸钴粒度减小及粒度分布得到改善的原因所在.
Small-size and monodispersed cobalt oxalate powders were prepared using CoCl2 solution and (NH4)2C2O4 solution by a precipitation process under the action of pulsed electromagnetic field (PEMF). The mechanism model of interaction between PEMF and reaction system was elementarily established. Meantime,the FTIR and conductivity data verified strongly the above mechanism of PEMF. The results indicate that the products prepared under the action of PEMF give rise to the formation of β-CoC2O4 · 2H2O particles and the av-erage diameter of as-prepared β-CoC2O4 · 2H2O powders is 3. 5403μm. Compared with the sample prepared with-out PEMF treatment, the average diameter is decreased by 60. 13％. The increases of the quantity of stable co-balt oxalate crystal nucleus and nucleation ratio result in decrease of the size and improvement of the size distri-bution of cobalt oxalate particles.
参考文献
| [1] | Liu Sha;Xu Kaihua;Wang Min .[J].International Journal of Refractory Metals and Hard Materials,2006,24:405-412. |
| [2] | 黄培云.粉末冶金原理[M].北京:冶金工业出版社,1982:50-60. |
| [3] | Tikkanen M H;Taskinen A;Taakinen P .[J].Powder Metallurgy,1975,18:259-282. |
| [4] | 高晋,王洪军.前驱物颗粒的形貌对钴粉形貌的影响[J].稀有金属与硬质合金,2002(02):15-18,27. |
| [5] | S. Roure;D. Bouvard;P. Doremus;E. Pavier .Analysis of die compaction of tungsten carbide and cobalt powder mixtures[J].Powder Metallurgy,1999(2):164-170. |
| [6] | Gillia O;Bouvard D .[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2000,279(1-2):185-191. |
| [7] | Mao L C;Shan Z Q;Yin S H et al.[J].Journal of Alloys and Compounds,1999,293-295:825-828. |
| [8] | Liu Y;Zhu Y;Zhang Y et al.[J].Journal of Materials Chemistry,1997,7(05):787-789. |
| [9] | 黄利伟.影响草酸钴分解速度及钴粉粒度的因素[J].有色金属（冶炼部分）,2007(01):41-45. |
| [10] | 刘志宏 .镍钴草酸盐制备中的形貌和粒度控制[D].长沙:中南大学,2007. |
| [11] | 袁平.草酸钴沉淀工艺对钴粉粒度影响的研究[J].硬质合金,2001(01):12-15. |
| [12] | 高晋,陈青林.活性球化剂对草酸钴形貌的影响[J].稀有金属与硬质合金,2001(03):20-22. |
| [13] | 王玉棉,李存增,侯新刚.表面活性剂在超细钴粉制备中的应用[J].兰州理工大学学报,2006(06):9-11. |
| [14] | 刘鹏成,王玉棉,侯新刚.新型超细钴粉的制备及添加剂对其性能影响[J].甘肃冶金,2006(01):24-26. |
| [15] | Niu HL.;Chen QW.;Zhu HF.;Lin YS.;Zhang X. .Magnetic field-induced growth and self-assembly of cobalt nanocrystallites[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,2003(7):1803-1805. |
| [16] | Wang F;Gu H Z;Zhang Z C .[J].Materials Research Bulletin,2003,38:347-351. |
| [17] | WANG Jian-zhong;QI Jin-gang;DU Hui-ling .Heredity of Aluminum Melt Caused by Electric Pulse Modification ( I )[J].Journal of Iron and Steel Research International,2007(4):75-78. |
| [18] | Yao S T;Vekilov P G .[J].Nature,2000,406:494-497. |
| [19] | 施尔畏;陈之战;元如林.水热结晶学[M].北京:科学出版社,2004:80-82. |
| [20] | 王建中 .电脉冲孕育处理技术与液态金属团簇结构假说的研究[D].北京:北京科技大学,1998. |
| [21] | 徐游.电磁学[M].北京:科学出版社,2004:278-279. |
| [22] | 陈松 .湿法制备单分散Co<,3>O<,4>粉末的形貌和粒度控制研究[D].中南大学,2003. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%