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| Effect and optimization of process variables on preparation of copper coated iron
powder by mechanochemistry |
| LI Shiwen，PANG Jianming，FANG Jianfeng，PAN Congchao，SONG Yaoxin |
| New Metallurgy Hi-Tech Group Co.，Ltd.，China Iron and Steel Research Institute Group，Beijing 100081，
China |
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Abstract By the orthogonal design of 4 factors and 3 levels，taking the coating rate of copper coated iron powder
（CCIP）as an index，the influence of process variables on preparation of（CCIP）by mechanochemistry was analyzed，
the priority of factors were determined and the superior combined level was selected. The results show that
the sequence of factors is：mixing time、sintering time、batching ratio、reduction temperature，and the optimal level
combination is the ratio of iron powder to copper oxide powder is 4：1，the high-speed mixing time is 20 min，the
sintering temperature is 900 ℃，the sintering time is 3 h. At this time，the coating rate of copper coating layer can
reach 95%. The analysis indicats that copper coated rate increases first but then drops with the increase of mixing
time. The reason is that over a certain mixing time，some CuO particles on the Fe-CuO composite particles are
peeled off under the strong mechanical force and the activity of bare surface of Fe particles decreases due to oxidation
or adsorption of tiny fine particles，which make readsorption of CuO particles difficult. Thus，the coating rate
is reduced. At the same time，the increase of sintering time can reduce the porosity as well as densification of the
copper coated layer，and improve the coating rate.
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Received: 23 July 2019
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2020, Vol. 30 
