Preparation method of high-thermal-conductivity graphite whisker-oriented and reinforced metal-based composite material
A technology of high thermal conductivity graphite and copper-based composite materials, applied in the field of electronic packaging composite materials, can solve the problem of insufficient thermal conductivity, and achieve the effects of low cost, high degree of directional distribution, and improved thermal conductivity
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[0025] Example 1
[0026] In this embodiment, the diameter of the graphite whiskers is 10 microns, and the average length is 300 microns. The matrix powder used is electrolytic copper powder with a mixed particle size of 400 mesh and 2000 mesh, with a purity of 99.99%, and the mass ratio of 400 mesh copper powder to 2000 mesh copper powder is 3:1.
[0027] Mix graphite whiskers, copper powder, and lactic acid in a volume ratio of 24:16:60, and add a small amount of 4% polyvinyl alcohol solution to the composite powder slurry, and add 2ml per 100ml composite powder slurry Solution of polyvinyl alcohol. Then, the composite powder slurry is put into a directional extrusion die for directional extrusion. The die has a slit with an opening width of 0.3 mm and an extrusion pressure of 2 MPa to obtain a flaky sintered precursor with a thickness of 0.3 mm. Subsequently, the sintered precursor was dried in a tube furnace to remove the liquid medium, and the drying temperature was 130° C. ...
Example Embodiment
[0028] Example 2
[0029] In this embodiment, the diameter of the graphite whiskers is 10 microns, and the average length is 200 microns. The base powder used is 400 mesh CuCr 0.08 Alloy powder.
[0030] Mix graphite whiskers, copper powder, and lactic acid in a volume ratio of 20:20:60. Then the composite powder slurry is put into a directional extrusion die for directional extrusion. The die extrusion port is a nozzle with an inner diameter of 0.5 mm and an extrusion pressure of 2 MPa to obtain a strip-shaped sintered precursor with a diameter of 0.5 mm. Subsequently, the sintered precursor was dried in a tube furnace to remove the liquid medium, and the drying temperature was 130° C. and the temperature was kept for 3 hours. The dried sintering precursor is laminated and put into the mold, and then vacuum hot-press sintering is performed. The sintering temperature is 980°C, the pressure is 40 MPa, and the furnace is cooled after holding for 30 minutes to obtain the graphite w...
Example Embodiment
[0031] Example 3
[0032] In this embodiment, the diameter of the graphite whiskers is 10 microns, and the average length is 200 microns. The base powder used is electrolytic copper powder with a mixed particle size of 400 mesh and 2000 mesh, with a purity of 99.99%, and the mass ratio of 400 mesh copper powder to 2000 mesh copper powder is 3:1.
[0033] A layer of titanium carbide with a thickness of 0.5 microns is plated on the surface of the graphite whiskers by salt bath plating. Put graphite whiskers and NaCl / KCl mixed salt with a certain amount of titanium powder (purity 99%) in a ball mill and mix for 30 minutes. The molar ratio of NaCl to KCl in the mixed salt is 1:1. The mass fraction is 10%. After mixing uniformly, put it into a tube furnace with protective atmosphere and heat to 800°C, keep it for 60 minutes, and then cool down with the furnace. The coated whiskers are washed with water and sieved to remove excess impurities to obtain graphite whiskers coated with tit...
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