Ultrathin graphite paper radiating fin and manufacturing method thereof

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...

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, and it is impossible to achieve the ultra-thin and ultra-light of high-end new products, so as to improve the service life of products

Existing patent number: 03815239.8 Although the patent says the thickness is 0.075mm-3.75mm, in fact their products can no longer meet the latest customer thickness requirements

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