Natural graphite/aluminium composite radiating fin and preparation method thereof

Abstract

The present invention provides a natural graphite / aluminium composite radiating fin and a preparation method thereof, relating to the field of heat radiation of heating elements of electronic products and the field of electromagnetic shielding of electronic products. The natural graphite / aluminium composite radiating fin includes an aluminum foil layer and graphite layers located on two faces of the aluminum foil layer. The aluminum foil layer includes an aluminium base material and coarsening layers located on two faces of the aluminium base material. Holes are distributed on the surface of the coarsening layer. The coarsening layer connects the graphite layer in an occlusion manner. The preparation method includes the steps as follows: pre-processing the surface of the aluminium foil; performing a coarsening process for the aluminium foil; stacking expanded worm-like graphite evenly and tiling the expanded work-like graphite on the aluminium foil; and performing staged rolling to obtain the natural graphite / aluminium composite radiating fin. The graphite layer connects the aluminium foil layer in an occlusion manner through holes so that the interface resistance of the aluminium foil and the graphite is lesser and the thermal conductivity in the Z-axis direction is increased greatly, the radiating fin has the excellent thermal conducting property and the excellent electromagnetic shielding effect, the radiating fin has the anti-stretching property, and the radiating fin can be bended for 180 degrees.

Description

technical field

[0001] The invention relates to the field of heat dissipation and electromagnetic shielding of heating components of electronic products, in particular to a natural graphite / aluminum composite heat sink and a preparation method thereof. Background technique

[0002] The current CPU generates heat due to high-speed operation, and the high-speed operation of the CPU is developed to improve the processing speed of its equipment. The demand for mobile phones, tablet computers, notebook computers and TVs and the use of display screens increase. The demand for high brightness of display screens increases the use of light-emitting diodes. However, the more light-emitting diodes are used, the power consumption increases, which also increases equipment At the same time, the battery power consumption increases, and the battery capacity also needs to be increased accordingly, which makes the display device generate more heat due to high energy consumption. If the heat g...

Examples

Embodiment

[0025] A preparation method of a natural graphite / aluminum composite heat sink, which is specifically carried out according to the following steps: 1. Double surface treatment of aluminum foil. In contact with air, hands and other handling tools, it is easy to be polluted by grease and salt, so it should be treated with neutral degreasing agent and neutral lotion; 2. The surface can be roughened by anodic oxidation or sandblasting. Rewind after cleaning. At this time, when winding the aluminum foil, it should be light and not too tight, so as not to damage the roughened layer on the surface. The roughened aluminum foil should be cleaned and dried to keep it stable for a period of time. At this time, when winding the aluminum foil, it should be light and not too tight, so as not to damage the roughened layer on the surface; 3. When the expandable graphite particles are heated to 850-1040°C, the graphite particles will expand to more than 60-100 times Worm graphite, the expanded...

technical field

[0001] The invention relates to the field of heat dissipation and electromagnetic shielding of heating components of electronic products, in particular to a natural graphite / aluminum composite heat sink and a preparation method thereof. Background technique

[0002] The current CPU generates heat due to high-speed operation, and the high-speed operation of the CPU is developed to improve the processing speed of its equipment. The demand for mobile phones, tablet computers, notebook computers and TVs and the use of display screens increase. The demand for high brightness of display screens increases the use of light-emitting diodes. However, the more light-emitting diodes are used, the power consumption increases, which also increases equipment At the same time, the battery power consumption increases, and the battery capacity also needs to be increased accordingly, which makes the display device generate more heat due to high energy consumption. If the heat g...

Examples

Embodiment

[0025] A preparation method of a natural graphite / aluminum composite heat sink, which is specifically carried out according to the following steps: 1. Double surface treatment of aluminum foil. In contact with air, hands and other handling tools, it is easy to be polluted by grease and salt, so it should be treated with neutral degreasing agent and neutral lotion; 2. The surface can be roughened by anodic oxidation or sandblasting. Rewind after cleaning. At this time, when winding the aluminum foil, it should be light and not too tight, so as not to damage the roughened layer on the surface. The roughened aluminum foil should be cleaned and dried to keep it stable for a period of time. At this time, when winding the aluminum foil, it should be light and not too tight, so as not to damage the roughened layer on the surface; 3. When the expandable graphite particles are heated to 850-1040°C, the graphite particles will expand to more than 60-100 times Worm graphite, the expanded...

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