摘要
硬质合金用钴粉的制备主要采用分解还原法,其原料为CoC2O4.2H2O、CoCO3.xH2O或Co3O4等。本文详细分析讨论了3种不同原材料的分解还原过程机理。并根据分解还原机理,利用形核和长大理论讨论和评价3种不同原材料制备所获得的钴粉的品质。指出制备超细球形钴粉的首要条件为采用超细球形原料;其次为从工艺上提高钴颗粒的形核速率,并降低其长大速率。从原材料上讲工艺控制的难易程度为CoC2O4.2H2O>CoCO3.xH2O>Co3O4。
Cobalt powder used in cemented carbides is mainly fabricated by hydrogen decomposition-reduction technology using cobalt compounds of cobalt oxalate（CoC2O4·2H2O）,cobalt carbonate（CoCO3·xH2O）,or cobalt oxide（Co3O4） as raw materials.The decomposition-reduction mechanisms of the above three cobalt compounds have been analyzed and discussed in detail in the present paper.According to the decomposition-reduction mechanisms,the effects of the character of raw materials powders and the technology parameters on the quality of cobalt powders were also discussed based on nucleation and growth theories.The results indicate that the ultra-fine spherical raw materials powders are necessary to obtain ultra-fine spherical cobalt powders.It is very important to improve the nucleation rate of the cobalt particles and restrain their growth rate during decomposition-reduction,and the order of the raw materials from difficult to easy for controlling technology is CoC2O4·2H2OCoCO3·xH2OCo3O4.
出处
《粉末冶金材料科学与工程》
EI
2010年第6期593-596,共4页
Materials Science and Engineering of Powder Metallurgy
基金
国家科技重大专项(20092X04012-032)
关键词
钴化合物
分解还原
超细球形钴粉
形核
长大
cobalt compound
decomposition-reduction
ultra-fine spherical cobalt powder
nucleation
growth
