Ultrathin graphite paper radiating fin and manufacturing method thereof

A manufacturing method and technology of graphite paper, applied in heat exchange equipment, lighting and heating equipment, laminated components, etc., can solve the problems of inability to achieve high-end new products, waste of resources, energy consumption, etc., and achieve the protection of scarce graphite resources, improving service life, and reducing the cost of raw materials

Inactive Publication Date: 2011-09-07
肖云凯
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, due to technical reasons, it is difficult for existing graphite paper manufacturers to make it less than 0.1 mm, and the main thickness is more than 0.2 mm, which makes high-end new products unusable. The thicker the product is, it not only consumes energy, pollutes, and wastes various resources

Method used

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  • Ultrathin graphite paper radiating fin and manufacturing method thereof
  • Ultrathin graphite paper radiating fin and manufacturing method thereof

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Effect test

Embodiment 1

[0026] The present invention adopts nitric acid+hydrogen peroxide to process graphite, and the proportioning ratio of nitric acid, hydrogen peroxide and graphite is 3:0.3:1, graphite is first added in the reaction kettle, and after reaching the reaction temperature of 16°C, the addition of nitric acid with a mass fraction of 90% and a concentration of 20 % hydrogen peroxide, graphite under the action of nitric acid and hydrogen peroxide, the temperature is controlled at 16 ° C, the reaction time is 1.5 hours, stirring to generate an expandable graphite product with an expansion rate of 300 times, dehydration by a dehydrator for 30 minutes, and drying in a drying oven for 30 minutes hours later.

[0027] Machine screening and classification, so that the expandable graphite on the 300 micron sieve accounts for 90%;

[0028] The processed expandable graphite enters the expansion furnace with a temperature of 950 degrees through the cyclone for heating and expansion, and the expan...

Embodiment 2

[0032] The present invention adopts nitric acid+hydrogen peroxide to process graphite, and the proportioning ratio of nitric acid, hydrogen peroxide and graphite is 3:0.3:1, graphite is first added in the reaction kettle, and after reaching the reaction temperature of 16°C, the addition of nitric acid with a mass fraction of 70% and a concentration of 50% % hydrogen peroxide, graphite under the action of nitric acid and hydrogen peroxide, the temperature is controlled at 16 ° C, the reaction time is 1.5 hours, stirring to generate an expandable graphite product with an expansion rate of 300 times, dehydration by a dehydrator for 30 minutes, and drying in a drying oven for 30 minutes hours later.

[0033] Machine screening and classification, selecting expandable graphite on a sieve with a particle size of 300 microns accounts for 90%;

[0034] The processed expandable graphite enters the expansion furnace with a temperature of 950 degrees through the cyclone for heating and ex...

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Abstract

The invention relates to a manufacturing method of an ultrathin graphite paper radiating fin. In the presence of nitric acid and hydrogen peroxide, graphite can stirred to be prepared into an expanded graphite product with the expansion ratio of 300 times, the expanded graphite product is dehydrated by a draining machine, dried by a drying oven and screened by a machine; the obtained graphite product is sent to an expansion furnace at a temperature of 950 DEG C for heating and expanding via a swirler, the expanded vermicular graphite is extracted from the expansion furnace and is sent to a stock bin; and according to different thickness requirements, vermicular graphite is subjected to repeated rolling until the thickness of final ultrathin graphite paper is reached. The thickness of the graphite paper radiating fin is equal to or greater than 0.04mm, the sulphur content is less than 1000ppm, and the thermal conductivity is more than 300W/moK. The invention, the obtained graphite paper radiating fin is thinnest, the miniaturization and ultra thin of the final product are realized, the service life of the product is improved, the problem of rapidly radiating at high temperature is solved, the cost of raw materials for producing the graphite paper radiating fin is lowered, rare graphite resources are protected and the uses of irregular shape products can be satisfied.

Description

technical field [0001] The invention relates to an ultra-thin graphite paper heat sink and a manufacturing method thereof. Background technique [0002] With the rapid development of society, new products are constantly emerging, all kinds of ultra-thin, ultra-light, energy-saving and environmentally friendly LED products, and the heat dissipation problem of electronic products are in front of us. The components in the products cannot quickly dissipate heat in a short time, which will cause The product system fails, reducing the service life of the product. Since traditional electronic products are not as ultra-thin, ultra-light, and durable as customers are pursuing today, the requirements for heat dissipation conditions are not so strict. With the development of technology, customers increasingly demand ultra-thin, ultra-light and durable products. The existing graphite paper heat sinks cannot be ultra-thin (increasing the thickness of graphite paper heat sinks will caus...

Claims

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Application Information

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IPC IPC(8): F28F3/00F28F21/02
Inventor 肖云凯
Owner 肖云凯
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