|
|
|
| Research on preparation of copper coated iron powder by mechanochemistry |
| LI Shi-wen，PANG Jian-ming，FANG Jian-feng |
| China Iron & Steel Research Institute Group，Beijing 100081，China |
|
|
|
|
Abstract 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．
|
|
Received: 20 June 2019
|
|
|
|
|
|
|
2019, Vol. 29 
