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Method for preparing high-thermal conductivity graphite radiating fins

A technology of high thermal conductivity graphite and graphite heat sink, which is applied in the direction of cooling/ventilation/heating transformation, etc., can solve the problems of low mechanical strength, short service life and unfavorable processing of graphite heat sink, so as to achieve the convenience of subsequent processing and use, and the service life Longer, improve the effect of mechanical properties

Inactive Publication Date: 2011-01-19
TIANNUO PHOTOELECTRIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There are certain defects in the above-mentioned method, one of which uses hydrofluoric acid to purify graphite and has the following deficiencies: one is the harm to the material itself
Second, fluorine-containing wastewater is too harmful
Its two, the mechanical strength of the prepared graphite heat sink is not high, the service life is short, easy to fall off, etc., and it is not conducive to subsequent processing

Method used

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  • Method for preparing high-thermal conductivity graphite radiating fins
  • Method for preparing high-thermal conductivity graphite radiating fins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] b. Then wash the treated graphite powder with water at room temperature to pH=6.5;

[0029] c. Put the washed graphite powder into a graphite expansion furnace for high-temperature expansion. The temperature of the graphite expansion furnace expands at a high temperature of 800 ° C for 20 hours, and then slowly cools to room temperature;

[0030] d. get the carbon black that the particle diameter is 0.5 μ m- is the composite particle of graphite powder, according to graphite powder: after the mass parts proportioning of carbon black=8: 1 is mixed, make density by flexible graphite coiled material production equipment: 0.5g / cm 3 , Thickness of 5mm graphite heat sink.

[0031] Example 2:

Embodiment 2

[0033] b. Then wash the treated graphite powder with water at normal temperature to pH=5;

[0034] c. Put the washed graphite powder into a graphite expansion furnace for high-temperature expansion. The temperature of the graphite expansion furnace expands at a high temperature of 1000 ° C for 3 hours, and then slowly cools to room temperature;

[0035] d. get the carbon black that particle diameter is 200 μ m to be the composite particle of graphite powder, after graphite powder: carbon black=2: 1 mass portion proportioning mixes, it is 1.5g to make density by flexible graphite coiled material production equipment / cm 3 , Thickness of 0.05mm graphite heat sink.

[0036] Example 3:

Embodiment 3

[0038] b. Then wash the treated graphite powder with water at room temperature to pH=6.0;

[0039] c. Put the washed graphite powder into the graphite expansion furnace for high-temperature expansion. The temperature of the graphite expansion furnace expands at a high temperature of 900 ° C for 10 hours, and then slowly cools to room temperature;

[0040] d. get the carbon black that particle diameter is 100 μ m and be the composite particle of graphite powder, according to graphite powder: carbon black=5: 1 mass part proportioning after orientation arrangement, make density by flexible graphite coiled material production equipment: 1.2g / cm 3 , Thickness of 3.0mm graphite heat sink.

[0041] Example 4:

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Abstract

The invention provides a method for preparing high-thermal conductivity graphite radiating fins. The method comprises the following steps of: a, soaking graphite powder serving as a raw material in acid treatment solution obtained by mixing sulfuric acid and hydrogen peroxide at the temperature of between 20 and 100 DEG C for 20 to 120 minutes; or treating the graphite powder by a high-temperature purification method; or soaking the graphite powder in mixed solution obtained by mixing fluorides and strong acid for 20 to 150 minutes; b, washing the treated graphite powder until the pH value is 5 to 6.5; c, putting the washed graphite powder into a graphite expansion furnace for expansion at the temperature of between 800 and 1,000 DEG C for 3 to 20 hours, and slowly cooling the graphite powder to room temperature; and d, in the mass ratio of the graphite powder to compound particles of 2-8:1, preparing the graphite radiating fins with the thickness of 0.05 to 5mm by using graphite coiled material manufacturing equipment.

Description

Technical field: [0001] The invention relates to a graphite heat sink with high thermal conductivity, and more specifically relates to a new type of heat conduction material used for heat conduction and heat dissipation of electronic products. Background technique: [0002] With the rapid development of microelectronics integration technology and high-density printed board assembly technology, the assembly density has increased rapidly, the volume of electronic components and logic circuits has been reduced by thousands of times, and electronic instruments and equipment are becoming lighter, thinner, shorter and smaller. direction development. Under high-frequency operating frequency, the working thermal environment of semiconductors moves rapidly towards high temperature. At this time, the heat generated by electronic components accumulates and increases rapidly. Under the ambient temperature of use, electronic components must still work normally with high reliability , an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K7/20C01B31/04
Inventor 余凤斌朱焰焰
Owner TIANNUO PHOTOELECTRIC MATERIAL
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