Abstract：With the rapid development of the fields of electronic information and new energy industries, the demand for new high-end functional metal materials has become more urgent. The micro-nano high purity copper powder has excellent characteristics, such as low sintering-temperature, low softening-temperature, high specific-surface, high electrical and thermal conductivity, and thus has become a key material in PCB interconnect, metallurgy and wind power fields. However, the preparation of micro-nano copper powders has still some difficult problems. In this paper, different preparation processes for micro-nano copper powders are analyzed, as well as their advantages and disadvantages. In the preparation of micron-sized copper powders, both electrolysis and atomization method are mainly adopted, but the purity of the copper powders obtained from the preparation is low. For the nano-sized copper powders, the liquid-phase reduction method is mainly adopted, which can meet the requirements of high purity and small size, while the difficulties of engineering mass production are needed to overcome.
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