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A kind of heat sink modified by graphene thermal conductive coating and preparation method thereof

A heat-conducting coating and graphene technology, applied in graphene, chemical instruments and methods, coatings, etc., can solve performance bottlenecks and other problems, achieve high production efficiency, improve bonding force, and maintain structural integrity.

Active Publication Date: 2020-05-15
徐海波
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, after many times of optimized design and long-term development of traditional tube-bundle and plate-fin radiators, performance improvement has encountered a bottleneck

Method used

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  • A kind of heat sink modified by graphene thermal conductive coating and preparation method thereof
  • A kind of heat sink modified by graphene thermal conductive coating and preparation method thereof
  • A kind of heat sink modified by graphene thermal conductive coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Firstly, a graphene oxide quantum dot solution is prepared. Using T700 12K (12,000 filaments) polyacrylonitrile-based carbon fiber tow as raw material, the carbon fiber has a monofilament diameter of 7 μm, which is composed of microcrystalline graphite sheet structure, and the three-dimensional size of the microcrystalline graphite is 10-40nm. The lamellar orientation is 90% compared to the fiber axis orientation. Cut the tip surfaces of the above 78 bundles of carbon fiber tows, and place vertically above the electrolytic cell filled with a 0.5M sodium hydroxide aqueous solution, and connect it as an anode to the positive pole of a DC power supply; 2 The SS 304 stainless steel mesh is completely immersed in the solution, and is used as the cathode to connect with the negative pole of the DC power supply; carefully adjust the parallel distance between the neat tip surface of the carbon fiber tow and the liquid surface of the solution before powering on, so that it just ...

Embodiment 2

[0058] The main difference from Example 1 is that only the outer surface within 1 cm of the root of the fin in contact with the heat dissipation substrate is coated with graphene oxide quantum dots and liquid phase exfoliated graphene by a spray coating process. The dispersion liquid of composite nanomaterials was dried at 120°C to form a graphene heat conduction layer with an average thickness of 0.5±0.1μm and an in-plane thermal conductivity of 1688W / m·K, and a heat sink modified with graphene heat conduction coating was obtained.

[0059] Similarly, a 150W LED lamp was installed as a heat source on the above-mentioned heat sink before and after modification of the graphene thermally conductive coating, and the natural heat dissipation effect was compared by detecting the surface temperature of the LED lamp under stable operation. The results showed that the LED before modification The surface temperature of the lamp is 85°C, and it is 78°C after modification.

Embodiment 3

[0061] The main difference from Example 1 is: after the heat dissipation base material and the fins are independently processed and formed, the dispersion liquid of the composite nanomaterial composed of graphene oxide quantum dots and liquid-phase exfoliated graphene is coated respectively by spraying process, After drying at 120°C, a graphene heat-conducting layer with an average thickness of 0.5±0.1μm and an in-plane thermal conductivity of 1688W / m·K is formed, and then the heat-dissipating base material and fins are connected into one body by a slotting process to obtain a graphene heat-conducting layer Coating modified radiator.

[0062] Similarly, a 150W LED lamp was installed as a heat source on the above-mentioned heat sink before and after modification of the graphene thermally conductive coating, and the natural heat dissipation effect was compared by detecting the surface temperature of the LED lamp under stable operation. The results showed that the LED before modif...

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Abstract

The invention provides a graphene thermal-conductive coating modified radiator and a preparation method thereof. The graphene thermal-conductive coating modified radiator is composed of a heat dissipation base material and multiple fins; a graphene thermal-conductive layer is on the outside surface of the heat dissipation base material; the multiple fins are contacted with the heat dissipation base material; the graphene thermal-conductive layer is at the root parts or on all the outside surfaces of the multiple fins; and the graphene thermal-conductive layer is formed by a composite nano-material, which is formed by graphene oxide quantum dots and liquid-phase stripped graphene. The graphene thermal-conductive coating modified radiator is prepared by coating the dispersion liquid of the composite nano-material formed by the graphene oxide quantum dots and the liquid-phase stripped graphene on the outside surface of the heat dissipation base material and the root parts or all the outside surfaces of the fins contacted with the heat dissipation base material in the manners of dipping, blade coating, spin coating, spray coating, slobbering or electrophoretic deposition. The graphene thermal-conductive coating modified radiator provided by the invention has the advantages of being abundant and cheap in raw material source, high in production efficiency, simple and easy in preparation process, good in heat dissipation effect and the like.

Description

technical field [0001] The invention belongs to the technical field of heat dissipation engineering, in particular to a heat sink modified with a graphene heat conducting coating and a preparation method thereof. Background technique [0002] Electronic products such as computer chips, high-power electronic equipment, and optoelectronic devices, household and industrial appliances such as air conditioners, televisions, refrigerators, and LED lighting, and modern transportation equipment such as automobiles, airplanes, ships, and high-speed rails, as they become lighter and smaller , The direction of high power is developing, and the heat generated per unit area is getting higher and higher, which puts forward higher requirements for the thermal control system. At present, after many times of optimized design and long-term development of traditional tube-bundle and plate-fin radiators, performance improvement has encountered a bottleneck. Therefore, how to quickly and safely...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K7/20F28F21/08B05D7/14C01B32/198C01B32/19
CPCB05D7/14B05D7/146F28F21/084H05K7/20409
Inventor 徐海波周泉竹
Owner 徐海波
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