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Preparation method of nano-porous copper cooling fin

A nanoporous copper and heat sink technology, applied in the field of metal materials, can solve the problems of heavy weight and difficult processing of pure copper heat sinks, and achieve the effects of light weight, good heat dissipation and easy processing.

Inactive Publication Date: 2016-11-09
袁春华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: as the function of the computer becomes more and more powerful, the heat dissipation requirements for the heat sink are getting higher and higher, the existing alloy heat sink is difficult to meet the heat dissipation requirements of the computer, and the pure copper heat sink has an excessive weight , the disadvantages of difficult processing, and the problem that it is easy to exceed the CPU’s limitation on the weight of the heat sink. The invention provides a preparation method for a nanoporous copper heat sink. The present invention uses copper nitrate as a raw material, and succinic acid, tetraethyl Ammonium bromide and hydrazine hydrate react to prepare nano-copper powder, and the graphite structure carbon nitride prepared by melamine is used as a pore-opening agent, and copper fiber is used as a reinforcing agent to blend with it, and press-molded in a heat sink mold to obtain a green body , and sintered at high temperature, and then use metallographic sandpaper to smooth the porous copper surface until it is bright and without scratches. After polishing, the nanoporous copper heat sink is made

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] Weigh 30g of succinic acid, 30g of tetraethylammonium bromide, and 50g of copper nitrate, add them into a grinder and grind them until transparent, add 250mL of hydrazine hydrate with a mass fraction of 80%, heat to 160°C, keep warm for 4h, filter, and use The mass fraction is 50% ethanol solution, washed 3 times, placed in a 100°C drying oven and dried to constant weight to obtain nano-copper powder; weigh 40g of melamine and place it in a box furnace, and heat it at 2.0°C / min under a nitrogen atmosphere React at 580°C for 3 hours, cool to room temperature, and take out to obtain carbon nitride with graphite structure; add the above-mentioned carbon nitride with graphite structure and the above-mentioned nano-copper powder into a planetary ball mill, ball mill at 200r / min for 6h, and pass the mixed powder over 200 Mesh sieve, mix the sieved mixed powder with 2g of copper fiber with a diameter of 80 μm, put it into a heat sink mold, and use a pressure of 180MPa, and a pr...

example 2

[0021] Weigh 40g of succinic acid, 40g of tetraethylammonium bromide, and 70g of copper nitrate, add them into a grinder and grind until transparent, add 280mL of hydrazine hydrate with a mass fraction of 80%, heat to 170°C, keep warm for 4.5h, and filter. Wash 4 times with 50% ethanol solution, place in a 102°C drying oven and dry to constant weight to obtain nano-copper powder; weigh 50g of melamine and put it in a box furnace, under nitrogen atmosphere, at 2.2°C / min Heat to 590°C and react for 3.5 hours, cool to room temperature, take out to obtain carbon nitride with graphite structure; add the above carbon nitride with graphite structure and the above nano-copper powder into a planetary ball mill, ball mill at 250r / min for 7 hours, and mix the powder Pass through a 200-mesh sieve, mix the sifted mixed powder with 2.5g of copper fibers with a diameter of 90 μm, put it into a heat sink mold, and use a pressure of 190MPa and a pressing time of 1.5min to obtain a green body af...

example 3

[0024]Weigh 50g of succinic acid, 50g of tetraethylammonium bromide, and 80g of copper nitrate, add them into a grinder and grind them until transparent, add 300mL of hydrazine hydrate with a mass fraction of 80%, heat to 180°C, keep warm for 5h, filter, and use The mass fraction is 50% ethanol solution, washed 5 times, placed in a 105°C drying oven and dried to constant weight to obtain nano-copper powder; weigh 60g of melamine and place it in a box furnace, and heat it at 2.5°C / min in a nitrogen atmosphere React at 600°C for 4 hours, cool to room temperature, and take it out to obtain graphite structure carbon nitride; add the above graphite structure carbon nitride and the above nano-copper powder into a planetary ball mill, ball mill at 300r / min for 8h, and pass the mixed powder over 200 Mesh sieve, mix the sieved mixed powder with 3g of copper fibers with a diameter of 100μm, put it into a heat sink mold, and use a pressure of 200MPa, and a pressing time of 2min to obtain ...

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Abstract

The invention relates to a preparation method of a nano-porous copper cooling fin and belongs to the field of metal materials. The requirements for cooling of cooling fins are higher and higher along with increasingly powerful functions of a computer, an existing alloy cooling fin meets the computer cooling requirement difficultly, and a pure copper cooling fin has the defects of being too large in weight and high in machining difficulty and also has the problem that the limitation of a CPU to the weight of the cooling fin is prone to being exceeded. The preparation method of the nano-porous copper cooling fin comprises the steps that copper nitrate serves as raw materials and react with succinic acid, tetraethylammonium bromide and hydrazine hydrate to prepare nano-copper powder, a graphite structure carbon nitride prepared from melamine serving as an opening agent and a copper fiber serving as a reinforcing agent are mixed with the nano-copper powder, extrusion forming is conducted in a cooling fin mould, and a green body is prepared and subjected to high-temperature sintering forming; then the surface of porous copper is ground through abrasive paper for metallograph until the surface of the porous copper is smooth and free of scratches, and after polishing is conducted, the nano-porous copper cooling fin is prepared.

Description

technical field [0001] The invention relates to a preparation method of a nanoporous copper heat sink, belonging to the field of metal materials. Background technique [0002] With the development of science and technology, the application range of porous metal materials is getting wider and wider, the functions are getting stronger and stronger, and new varieties are constantly emerging. The so-called porous metal refers to an artificial metal material containing a large number of three-dimensional pore structures inside. Porous metal has dual characteristics of function and structure, and most of them inherit the original advantages of the base metal, such as the excellent electrical and thermal conductivity of copper, and the good Anti-corrosion candle performance, biocompatibility of titanium, etc. At the same time, due to the existence of a large number of pore structures inside, the material has many advantages that its base metal does not have. Porous metal material...

Claims

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Application Information

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IPC IPC(8): C22C9/00C22C1/08B22F9/24B22F3/02B22F3/11C22C32/00
CPCC22C9/00B22F3/02B22F3/1103B22F9/24C22C32/0068
Inventor 袁春华王龙
Owner 袁春华
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