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Preparation method of high-heat-conductivity graphite radiating fin

A technology of high thermal conductivity graphite and heat sink, applied in the direction of graphite, cooling/ventilation/heating transformation, etc., can solve the problems of high reaction temperature, difficult control, dangerous operation, etc., achieve mild reaction conditions, simple preparation process, and small environmental pollution Effect

Active Publication Date: 2013-12-25
SHENZHEN HFC SHIELDING PRODS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The problems existing in the traditional preparation method are: impregnating graphite with high-concentration sulfuric acid and nitric acid, the reaction temperature is high, the operation is dangerous, and the control is difficult; The sulfur content of expandable graphite is 3%-4.5%. This expandable graphite with high sulfur content will corrode the metal sealing surface of the partner in contact with it, making the seal invalid, seriously affecting the quality of the product and the life of the accessories, and even This problem has seriously restricted the promotion and application of expandable graphite products.
"This content only discloses the traditional method of expanding graphite, but due to the high sulfur content of the final product, it can only be applied to conventional heat dissipation products or sealing products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of a high thermal conductivity graphite heat sink, specifically comprising the following steps:

[0035] 1) Raw material selection: select graphite powder with a carbon element content of 98%, and use natural graphite powder with a natural particle size of 50 mesh.

[0036] 2) Chemical treatment: put the natural graphite powder into the ammonium peroxodisulfate solution for oxidation treatment; the concentration of the ammonium peroxodisulfate solution is 95%. Then put it into the mixed solution of phosphoric anhydride, nitric acid and oxalic acid for intercalation treatment, the weight ratio is phosphoric anhydride: nitric acid: oxalic acid = 5:3:0.1, the temperature of intercalation treatment is 80°C, and the time is 1h.

[0037] 3) Water washing: Wash the acid-treated graphite powder with constant stirring during the washing process. The washing temperature is 25°C and the washing time is 30 minutes. Adjust the Ph of the washing liquid after wash...

Embodiment 2

[0042] 1) Raw material selection: choose graphite powder with a carbon element content of 99%, and use natural graphite powder with a natural particle size of 400 mesh.

[0043] 2) Chemical treatment: put the natural graphite powder into the ammonium peroxodisulfate solution for oxidation treatment; the concentration of the ammonium peroxodisulfate solution is 95%. Then put it into the mixed solution of phosphoric anhydride, nitric acid and oxalic acid for intercalation treatment, the weight ratio is phosphoric anhydride: nitric acid: oxalic acid = 6:1.5:0.1, the temperature of intercalation treatment is 120°C, and the time is 0.5h.

[0044] 3) Washing: Wash the acid-treated graphite powder with constant stirring during the washing process. The washing temperature is 35°C and the washing time is 50 minutes. Adjust the Ph of the washing solution to 6.5.

[0045]4) High-temperature expansion: put the washed graphite powder into a microwave oven, and use the microwave method to h...

Embodiment 3

[0049] 1) Raw material selection: choose graphite powder with a carbon element content of 99.95%, and use natural graphite powder with a natural particle size of 800 mesh.

[0050] 2) Chemical treatment: put the natural graphite powder into the ammonium peroxodisulfate solution for oxidation treatment; the concentration of the ammonium peroxodisulfate solution is 95%. Then put it into the mixed solution of phosphoric anhydride, nitric acid and oxalic acid for intercalation treatment, the weight ratio is phosphoric anhydride: nitric acid: oxalic acid = 4:1:0.1, the temperature of intercalation treatment is 100°C, and the time is 1.5h.

[0051] 3) Water washing: Wash the acid-treated graphite powder with constant stirring during the washing process. The washing temperature is 30°C and the washing time is 40 minutes. Adjust the Ph of the washing solution to 6 after washing.

[0052] 4) High-temperature expansion: put the washed graphite powder into a microwave oven, and use the m...

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Abstract

The invention discloses a preparation method of a high-heat-conductivity graphite radiating fin. Natural flake graphite is used as a raw material, ammonium peroxydisulfate is used as an oxidant, nitric acid phosphoric anhydride are used as intercalators, and a small amount of oxalic acid is used as a reducer to prepare low-sulfur highly-expanded graphite; and a water washing method and an expansion method are improved to finally prepare the high-heat-conductivity graphite radiating fin, wherein the sulfur content of the prepared expanded graphite is less than 1%. The method has the advantages of simple preparation technique, mild reaction conditions, small environmental pollution, accessible raw materials, low cost and the like, and is easy to master and convenient for popularization.

Description

[0001] technical field [0002] The invention relates to a preparation method of a graphite heat sink, in particular to a preparation method of a high thermal conductivity graphite heat sink. [0003] Background technique [0004] 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 of 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 , and the ability to dissipate heat in time ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K7/20C01B31/04C01B32/21
Inventor 谢佑南
Owner SHENZHEN HFC SHIELDING PRODS CO LTD
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