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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Embodiment 1
[0026] The graphite whiskers in this embodiment have a diameter of 10 microns and an average length of 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%, wherein 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 evenly in a volume ratio of 24:16:60, add a small amount of polyvinyl alcohol solution with a mass concentration of 4% to the composite powder slurry, and add 2ml per 100ml of composite powder slurry solution of polyvinyl alcohol. Then put the composite powder slurry into a directional extrusion die for directional extrusion. The extrusion port of the die is a gap with an opening width of 0.3 mm, and the extrusion pressure is 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, ...
Embodiment 2
[0029] The graphite whiskers in this embodiment have a diameter of 10 microns and an average length of 200 microns. The matrix 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 evenly. Then put the composite powder slurry into a directional extrusion die for directional extrusion. The extrusion port of the die is a nozzle with an inner diameter of 0.5 mm, and the extrusion pressure is 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. for 3 hours. The dried sintered precursors are laminated into a mold, followed by vacuum hot pressing and sintering. The sintering temperature is 980°C, the pressure is 40MPa, and the graphite whisker / copper composite material is obtained after holding the heat for 30 minutes and then cooling with ...
Embodiment 3
[0032] The graphite whiskers in this embodiment have a diameter of 10 microns and an average length of 200 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%, wherein 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 whisker by means of salt bath plating. Graphite whiskers and the NaCl / KCl mixed salt that adds a certain amount of titanium powder (purity 99%) are put into ball mill and mix 30 minutes, and the mol ratio of NaCl and KCl in the mixed salt is 1:1, and the ratio of titanium powder in the mixed salt The mass fraction is 10%. After mixing evenly, put it into a tube furnace with a protective atmosphere and heat it to 800°C, keep it warm for 60 minutes and then cool it with the furnace. The coated whiskers are washed with water and sieved to remov...
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