机械化学法制备铜包铁复合粉的研究  

Research on preparation of copper coated iron powder by mechanochemistry

作　　者：李石稳 庞建明 方建锋 LI Shi-wen;PANG Jian-ming;FANG Jian-feng(China Iron&Steel Research Institute Group,Beijing 100081,China)

机构地区：[1]中国钢研科技集团有限公司

出　　处：《粉末冶金工业》2019年第6期6-12,共7页Powder Metallurgy Industry

摘　　要：本文提出了一种新的铜包铁粉的制备方法,利用机械力化学效应将超细CuO粉包覆在Fe粉上,通过H2还原与烧结制备出粉末冶金用的铜包铁粉。在机械力作用下,Fe与CuO在常温下可发生氧化-还原反应生成Cu、Cu2O、Fe3O4,反应类型与热力学计算结果相符。细化后的CuO粉具有更高的表面缺陷密度与表面能,这为Fe与CuO的化学反应提供了更好的动力学条件。在H2还原过程中,还原产物Cu在Fe表面形核长大获得了良好的界面结合,同时烧结作用可使Cu颗粒互相黏结,使得Cu包覆层致密、均匀。A new preparation method of copper coated iron powder was proposed in this paper.Superfine copper oxide powder was coated on iron powder by mechanochemical effect and the Cu-coated Fe powder was obtained by hydrogen reduction and sintering.Under the action of mechanical force,oxidation-reduction reactions take place between Fe and CuO to produce Cu,Cu2O,Fe3O4,and the reacting types are consistent with the results from thermodynamic calculations.The superfine copper oxide powder after milling has higher surface defect density and surface energy,which provides better kinetic conditions for the reaction of Fe and CuO.During the process of H2 reduction,the product Cu nucleates and grows on the iron surface to get a good interfacial bonding.Meanwhile,sintering can dramatically bond copper particles,which densifies and homogenizes the copper coating layer.

关 键 词：铜包铁粉 机械力化学 CuO粉 H2还原 烧结 

分 类 号：TB383.3[一般工业技术—材料科学与工程]