A powder metallurgy preparation method of diamond composite heat dissipation material
A composite heat dissipation material and powder metallurgy technology, which is applied in the field of powder metallurgy, can solve the problems of poor thermal conductivity of composite heat dissipation materials, insufficient density of copper-based sintered matrix, and great difference in thermal expansion coefficient, etc., to reduce the number of interfaces, low cost, Effect of improving sintered density
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[0029] A powder metallurgy preparation method of a diamond composite heat dissipation material in this embodiment comprises the following steps:
[0030] S1: Selection of raw materials: Super diamond crystals prepared by using a nickel-plated diamond single crystal with a mass fraction of 6.5% to 13.6% (corresponding to a volume concentration of 60 to 120%) and a water atomization method with a mass fraction of 1 to 5% Fine CuSn15 bronze powder, 0.3-1.0% by mass of composite nickel-plated / copper carbon fiber, or composite nickel-plated / copper silicon carbide whiskers, the balance is electrolytic copper powder, and the alcohol solution of polyvinylpyrrolidone (K90) is Granulating agent;
[0031] S2: Cold-pressed billet: the raw material powder is mixed and granulated with K90 as the granulating agent, and the granulated material is cold-pressed into a sheet-shaped green body in a steel mold;
[0032] S3: Put the cold-pressed body into a hydrogen reduction furnace for high-temp...
Embodiment 1
[0044] 120 pieces of diamond / copper heat dissipation substrates with a specification of 15mm×15mm×2mm were prepared by using an ordinary four-column hot-pressing sintering machine. When designing the product, the designed amount of diamond added is described in terms of volume concentration according to industry practice (adding 4.4 carats of diamond to a volume of 1 cubic centimeter is defined as 100% volume concentration), and the actual input of diamond is converted according to the designed volume concentration. Weigh for weight. In the present embodiment, the parts by weight of nickel-plated diamond (35 / 40 order, nickel-plated weight gain 30%) are 11.4% (volume concentration is 80%), and the addition of ultrafine CuSn15 is 1% of total feeding weight, composite The addition amount of nickel / copper-plated carbon fiber is 0.5% of the total charge, and the balance is electrolytic copper powder. The selected materials are mixed and granulated, and the addition amount of the g...
Embodiment 2
[0059] 120 pieces of diamond / copper heat dissipation substrates with a specification of 15mm×15mm×2mm were prepared by using a six-sided top press. The proportioning of material and the weighing weight are identical with embodiment 1, namely: the volume concentration of diamond (35 / 40 order, nickel-plated weight gain 30%) is 80%, and the addition of superfine CuSn15 is 1% of total feeding weight , the addition of composite nickel / copper carbon fiber is 0.5% of the total feed, and the addition of granulating agent K90 is 0.5% of the feed weight.
[0060] According to the steps (1)-(3) of Example 1, the reduced pre-sintered body was prepared.
[0061] Put the pre-reduced sintered green body into the pyrophyllite sintered assembly block, the workpieces are separated by graphite pads with a thickness of 2mm, 10 pieces / mold. Under the conditions of 950°C and 5GPa in a six-sided top press, heat-preserve and sinter for 3 minutes, remove the mold and take out the parts after natural ...
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