A powder metallurgy preparation method of fine-grain diamond-copper-based composite heat dissipation material
A copper-based composite and powder metallurgy technology, applied in the field of powder metallurgy, can solve the problems of large number of pores, lower thermal conductivity of heat sink, and inability to fill metal materials, so as to improve sintering density and solve engineering application problems.
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[0026] A powder metallurgy preparation method for a fine-grained diamond-copper-based composite heat dissipation material, comprising the following steps:
[0027] S1: Weighing according to weight percentage: 4.2-11.6% by weight of fine-grained diamond, 1-5% by weight of water atomized ultrafine CuSn15 bronze powder, 0.1-0.5% by weight of composite nickel / copper carbon fiber / silicon carbide whisker, 1.5-3.0% by weight polyvinylpyrrolidone alcohol solution, and the balance is electrolytic copper powder;
[0028] S2: Cold compacting: the raw material powder is mixed and granulated with K90 alcohol solution as a granulation binder, and then cold pressed into a sheet-shaped green body in a steel mold;
[0029] S3: High-temperature reduction pre-sintering: put the cold-pressed tablet into a hydrogen reduction furnace for high-temperature reduction pre-sintering;
[0030] S4: High-temperature and high-pressure densification sintering: put the pre-reduced sintered body into a graphi...
Embodiment 1
[0041] A four-column hot-press sintering machine was used to prepare a sheet-shaped diamond / copper composite heat dissipation substrate with a specification of 15mm (length) × 15mm (width) × 1mm (thickness), a total of 160 pieces, 16 pieces / mold (4 layers of material / mold, Single charge 4 slices). Wherein, the design addition amount of diamond is described by volume concentration (adding 4.4 carat diamond in 1 cubic centimeter volume, is defined as 100% volume concentration), when actually dropping into diamond, convert to weight after conversion according to the design volume concentration. In the present embodiment, composite titanium / nickel plating (titanium plating weight gain is 0.3%, nickel coating weight gain is 20%) diamond mass ratio is 7.7% (corresponding design volume concentration is 60%), The mass proportion of ultrafine CuSn15 powder is 1%, the weight proportion of composite nickel / copper-coated carbon fiber (length 74 μm) is 0.5%, and the balance is electrolytic...
Embodiment 2
[0065] Densification sintering was carried out using a six-sided top press to prepare a diamond / copper heat dissipation substrate with the same specifications and proportions as in Example 1.
[0066] Take steps (1) to (4) in Example 1 to prepare a pre-reduced sintered diamond / copper heat sink;
[0067] Place the above-mentioned pre-reduced sintered sheets in the pyrophyllite assembly block, 10 pieces / group, and use graphite with a thickness of 2mm as the spacer between the sheets, and sinter and densify at high temperature and high pressure in a six-sided top press, at a temperature of 950°C , Keep warm for 3 minutes at a pressure of 4.5GPa, remove the mold and pick up the parts after natural cooling;
[0068] The workpiece is fixed on the rotary polishing device, and the soft polishing cloth with short-pile fiber and the polishing liquid are used for polishing with water as the medium, and then the polished workpiece is ultrasonically cleaned in industrial alcohol solution a...
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