Method for preparing light highly-conductive hot carbon nano composite material

A composite material and high thermal conductivity technology, applied in the field of carbon nanomaterials, can solve problems such as long production cycle, influence of density and purity on thermal conductivity, high raw material requirements, etc., to achieve improved high temperature thermal conductivity, excellent product repeatability, and preparation process simple effect

Active Publication Date: 2008-08-27
上海纳晶科技有限公司
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Problems solved by technology

[0003] Traditional heat-conducting materials are mainly metals, such as silver, copper, aluminum, alloys and their oxides or nitrides. The material has a high density and a heavy weight. When the temperature changes, the stress generated between the metal heat-conducting material and the chip is likely to cause The device fails to work; in addition, the density and purity of the metal material have a great influence on the thermal conductivity, and it is not resistant to corrosion. Most of the metal or alloy materials have high costs, which limit the application of this type of thermal conductivity material in high-power devices. application
[0004] Carbon materials have become one of the hotspots in the development of high thermal conductivity materials due to their excellent properties such as low density, high thermal conductivity, low expansion coefficient, and high strength. Among them, diamond and graphite materials are typical. Diamond is a high-strength, high-hardness material. Insulated high thermal conductivity material with a thermal conductivity of up to 2000W / m*k, but its application is limited due to its high cost. Graphite materials have high strength, electrical conductivity and thermal shock resistance. The thermal conductivity of ordinary graphite materials The conductivity at room temperature is 100W / m*k, while the theoretical thermal conductivity of graphite single crystal can reach 2100W / m*k; the traditional preparation method of high thermal conductivity graphite material is mainly: calcining raw materials, crushing, sieving, On the basis of the mass ratio of fine powder, add binder for mechanical mixing and thermal kneading, then molding, circular roasting, and finally graphitization treatment. The whole production cycle is long, and it has low yield, high raw material requirements, and high consumption. Can wait for disadvantage
[0005] Carbon nanotubes are a kind of graphite material, so carbon nanotube composite materials also have the characteristics of light weight, high strength, high elastic modulus and ductility below 2000 °C, and even at high temperatures of 1000 °C under atmospheric conditions. It has a small thermal expansion coefficient, but carbon nanotubes are easily oxidized by high temperature in an oxygen environment, and their strength and performance will be destroyed

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  • Method for preparing light highly-conductive hot carbon nano composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of bulk carbon nanotube composites by blending method:

[0020] Prepare 20g of carbon nanotube powder by electric arc method or laser method, and then soak it in hydrochloric acid or nitric acid or sulfuric acid solution with a concentration of 6mol / L for 24 hours to purify carbon nanotubes; then take 15g of carbon nanotube powder after cleaning, filtering and drying Tube; The mesophase pitch is diluted to a concentration of 12.5wt% with carbon tetrachloride;

[0021] Use wet ball milling to mix carbon nanotubes: choose a satellite ball mill, the ball mill tank is a steel tank, the grinding balls are 5 large steel balls, 20 small steel balls, the outer diameter of the large steel ball is 10mm, the outer diameter of the small steel ball is 6mm, and the total mass is 151.1g ; The ball milling speed is 100 rpm; the ball milling time is 0.5 hours;

[0022] Take out the ball-milled mixture, pour it into 20ml of acetone, and then remove the large particles in the...

Embodiment 2

[0028] Preparation of aligned carbon nanotube composite film by injection method:

[0029] Quartz glass or silicon substrate, using nickel-chromium alloy film as the catalyst layer, preparing aligned carbon nanotube film by plasma enhanced chemical vapor deposition method, and then purifying carbon nanotube by oxidation method, the temperature is 300 °C, and the time is 0.5 hour; The high carbon resin is diluted with alcohol to a concentration of 25wt%;

[0030] Place the aligned carbon nanotube film with the substrate in a closed container, and inject the high-carbon resin solution under pressure: pressure 4Mpa;

[0031] Put the impregnated aligned carbon nanotube film into an oven and bake at 30°C for 0.5 hours;

[0032] Graphitization treatment: Vacuum furnace, under argon atmosphere, increase the temperature to 300°C, keep for 20 minutes, raise the temperature to 800°C, keep the temperature for 30 minutes; then raise the temperature to 1800°C, keep for 20 minutes;

[003...

Embodiment 3

[0035] Preparation of sheet-like nano-carbon fiber composites by impregnation method:

[0036] Pure nickel sheet or copper-nickel sheet is used as the substrate, and the carbon nanotube / fiber thick film is prepared by thermal chemical vapor deposition, with a thickness of 1-2 mm and a certain degree of flexibility; dilute the high-carbon polymer to a concentration of 10wt %;

[0037] Peel off the carbon nanotube / fiber thick film from the substrate and leave it in a 10wt% high-carbon polymer solution for 24-40 hours;

[0038] Put the impregnated aligned carbon nanotube film into an oven and bake at 30°C for 0.5 hours;

[0039] Graphitization treatment: vacuum furnace, under hydrogen environment, the temperature is raised to 300°C, kept for 20 minutes, raised to 800°C, kept for 30 minutes, then raised to 1800°C, kept for 20 minutes;

[0040] In the case of hydrogen circulation, the temperature is naturally cooled and taken out to obtain a light-weight and high-thermal-conducti...

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Abstract

The invention relates to a preparation method of light carbon nanometer composite material with high thermal conductivity, belonging to the technical field of carbon nanometer material, which comprises selecting raw materials that uses carbon nano-tubes / carbon fibers as carbon raw material and uses high-carbon organic solution as stuff, mixing and solidifying that mixes and solidifies the carbon nano-carbon organic solution / carbon fiber with the high carbon organic solution, and graphitizing that sinters the material in a vaccum furnace under the protection of inertia gas or hydrogen gas at high temperature. Compared with the prior art, the invention uses carbon nano-tube / carbon fiber as raw material and has the characters of simple preparation, low energy consumption and low cost, and improves the high-temperature thermal conductivity of carbon nano-tube / carbon fiber with confirmed light weight and high strength, thereby reducing the product weight and obtaining better plasticity, thermal conductivity and thermal stability, with simple operation and better product repeatability.

Description

[technical field] [0001] The invention relates to the technical field of carbon nanomaterials, in particular to a method for preparing a light-weight and high-thermal-conductivity carbon nanocomposite material. [technical background] [0002] With the rapid development of science and technology, high-power devices are developing toward miniaturization, light weight, compact structure, and high-efficiency operation. At the same time, high-power optoelectronic devices with high power density such as high-power light-emitting diodes (LEDs) and laser diodes (LDs) have emerged. In order to ensure The steady-state operation of devices and systems requires that heat be exported in a timely manner. Therefore, higher requirements are placed on the quality, thermal conductivity, strength, and stability of heat dissipation materials. [0003] Traditional heat-conducting materials are mainly metals, such as silver, copper, aluminum, alloys and their oxides or nitrides. The material has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/524C04B35/622C09K5/14
Inventor 张哲娟孙卓潘丽坤
Owner 上海纳晶科技有限公司
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