Super-fine grain twin-peak copper preparing method

[0016] Example 1:

[0017] A preparation method of ultra-fine crystal bimodal copper material includes the following steps:

[0018] Mixing: Use a TLHL three-dimensional blender to uniformly mix 70% by mass nanometer copper powder and 30% by mass micron copper powder for 20 minutes to obtain mixed copper powder;

[0019] Reduction: performing hydrogen reduction on the mixed copper powder in a high vacuum furnace for 30 minutes to 60 minutes to obtain reduced mixed copper powder, and the reaction temperature is set to 400°C to 500°C;

[0020] Cooling: cooling the reduced mixed copper powder to room temperature in an argon atmosphere;

[0021] High-temperature pressurization: the cooled reduced mixed copper powder is compressed at high temperature at 700°C, 800°C, and 900°C respectively; the pressure conditions of each compression process are all 5GPa; each compression process includes boosting 15 minutes, pressure maintaining for 30 minutes, and pressure reduction for 20 minutes; the press

[0030] Example 2:

[0031] A preparation method of ultra-fine crystal bimodal copper material includes the following steps:

[0032] Mixing: Use a TLHL three-dimensional mixer to uniformly mix 90% by mass nanometer copper powder and 10% by mass micron copper powder for 20 minutes to obtain mixed copper powder;

[0033] Reduction: performing hydrogen reduction on the mixed copper powder in a high vacuum furnace for 30 minutes to 60 minutes to obtain reduced mixed copper powder, and the reaction temperature is set to 400°C to 500°C;

[0034] Cooling: cooling the reduced mixed copper powder to room temperature in an argon atmosphere;

[0035] High-temperature reduction: the cooled reduced mixed copper powder is compressed at high temperatures at 700°C, 800°C, and 900°C; the pressure conditions of each compression process are all 5 GPa; each compression process includes a pressure increase 15 Minutes, pressure retention for 30 minutes, and pressure reduction for 20 minutes; the pressure reten