A kind of preparation method of high density cu/cucr gradient composite material
A composite material and dense technology, which is applied in the field of preparation of high-density Cu/CuCr gradient composite materials, can solve problems such as thermal cracks, pores easily produced by laser welding technology, harmful effects, etc., and achieve high electrical and thermal conductivity, low cost, and low cost. The effect of air content
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Embodiment 1
[0027] The preparation of Cu / CuCr gradient composite material in this embodiment is carried out as follows:
[0028] Step 1. Weigh 700g of Cu powder and 300g of Cr powder respectively, and mix for 10h by mechanical mixing method to obtain uniform CuCr mixed powder;
[0029] Step 2. Fill 10g Cu powder and 8g CuCr mixed powder into the sintered graphite mold in turn; adjust the height of the upper and lower pressure heads of the sintered graphite mold and the position of the powder green body in the mold; Preloading, the pressure is ~10MPa;
[0030] Step 3. Wrap the powdered graphite mold with a carbon felt that is as high as the graphite mold, the thickness of which is ~5mm, and then put it into the furnace cavity of the discharge plasma sintering furnace, evacuate to below 5Pa, and feed direct current Pulse current sinters the powder into shape. Its sintering process is as follows:
[0031] Sintering pressure: 30MPa;
[0032] Sintering temperature: 850°C;
[0033] Heating...
Embodiment 2
[0037] The preparation of the Cu / CuCr gradient composite material of the present embodiment is carried out as follows:
[0038] Step 1. Weigh 700g of Cu powder and 300g of Cr powder respectively, and mix for 10h by mechanical mixing method to obtain uniform CuCr mixed powder;
[0039] Step 2. Fill 10g Cu powder and 8g CuCr mixed powder into the mold in turn; adjust the height of the upper and lower pressure heads and the position of the powder body in the mold; use a manual hydraulic press to pre-press the loaded powder, and the pressure is ~ 10MPa;
[0040] Step 3. Wrap the powdered graphite mold with a carbon felt that is as high as the graphite mold, the thickness of which is ~5mm, and then put it into the furnace cavity of the discharge plasma sintering furnace, evacuate to below 5Pa, and feed direct current Pulse current sinters the powder into shape. Its sintering process is as follows:
[0041] Sintering pressure: 10MPa;
[0042] Sintering temperature: 900°C;
[00...
Embodiment 3
[0047] The preparation of the Cu / CuCr gradient composite material of the present embodiment is carried out as follows:
[0048] Step 1. Weigh 700g of Cu powder and 300g of Cr powder respectively, and mix for 10h by mechanical mixing method to obtain uniform CuCr mixed powder;
[0049] Step 2. Fill 10g Cu powder and 8g CuCr mixed powder into the mold in turn; adjust the height of the upper and lower pressure heads and the position of the powder body in the mold; use a manual hydraulic press to pre-press the loaded powder, and the pressure is ~ 10MPa;
[0050]Step 3. Wrap the powdered graphite mold with a carbon felt that is as high as the graphite mold, the thickness of which is ~5mm, and then put it into the furnace cavity of the discharge plasma sintering furnace, evacuate to below 5Pa, and feed direct current Pulse current sinters the powder into shape. Its sintering process is as follows:
[0051] Sintering pressure: 60MPa;
[0052] Sintering temperature: 700°C;
[005...
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Abstract
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