The invention discloses micro-nano double-stage porous
copper. By using a sintered porous Cu framework as a substrate, double continuous micro-
nano porous structures are formed on the substrate, wherein the average aperture of micro-holes is 2.18 microns to 3.68 microns, and the average aperture of nano-holes is 153nm to 234nm, so that organic combination of
sintering preparation of the micro-holes and de-alloying preparation of the nano-holes in a
copper matrix is realized, and the micro-nano double-stage porous
copper has the characteristics of a micro-hole / nano-hole composite hole structureand a three-dimensional double continuous
ligament / pore canal structure. A preparation method of the micro-nano double-stage porous copper comprises the following specific steps: 1, uniformly mixingpowder Cu with
powder Zn in a certain proportion to obtain mixed
powder and compressing the mixed
powder into a blank, putting the blank into an
atmosphere tube type furnace, heating the blank to a certain temperature, and cooling the blank to a
room temperature after heat insulation is carried out for a certain time so as to obtain a precursor CuZn
alloy; and 2, putting the precursor into a
hydrochloric acid solution and performing de-alloying until air bubbles are not obviously effused so as to obtain the micro-nano double-stage porous copper. The preparation process of the micro-nano double-stage porous copper is simple and convenient, and is easy for realization.