Graphite radiating module and manufacturing process thereof

A technology of heat dissipation module and manufacturing process, applied in manufacturing tools, metal material coating process, metal processing and other directions, can solve the problem of difficult low temperature welding graphite material strength, etc., to avoid graphite particles falling off, improve heat resistance, avoid short circuit effect

Inactive Publication Date: 2010-05-19
DALIAN LICHANG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to improve the mechanical strength and heat resistance of the graphite heat sink by metallizing the surface, and make the graphite heat sink and the metal base can be combined by reflow process and gear shaping process to solve the problem of graphite material and metal material. It is difficult to solder at low temperature due to non-wetting and it is difficult to insert teeth due to insufficient strength of graphite material. At the same time, it improves the thermal conductivity, high temperature resistance and service life of this type of heat conduction product, and removes the potential risk factors of graphite heat dissipation products used in precision electronic equipment. Provides a connection method for graphite heat sink fins and metal bases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: After cleaning the graphite sheet, soak the graphite sheet with dilute hydrochloric acid for 1-3 minutes, wash it with water or ethanol, and after drying, use electrolytic solution to copper-plate for 1 hour with a coating thickness of 16 μm. If the shape is needed, dry it in an oven at 90°C for 2 hours. Wipe the graphite sheet with absorbent cotton dipped in ethanol, and dry it in an oven at 110°C for 30 minutes. Clean the metal base with dilute hydrochloric acid with a concentration of 3mol / L to remove surface oxides, clean it with an ultrasonic cleaner for 10 minutes, and dry it with hot air with a hair dryer. Mix 50% tin-bismuth solder paste, 15% high-grade resin, 20% spherical graphite powder, 5% copper powder, and 10% curing agent to form solder. Put the solder into the groove of the base, insert the graphite fin, and put it into the reflow oven for low temperature soldering. The maximum welding temperature is 150°C, and the welding time is 10 seconds...

Embodiment 2

[0033]Embodiment two: the graphite flake is through clean treatment, soaks the graphite flake with dilute hydrochloric acid 1~3 minute, washes with water or cleans with ethanol, after drying, parts such as iron and steel whose surface is removed from oil rust are made cathode, and pure copper plate is made anode, Hang it in an alkaline electroplating solution containing cuprous cyanide, sodium cyanide and sodium carbonate, and perform alkaline (cyanide) copper plating. The thickness of the coating is 20 μm. Let dry for 2 hours. Wipe the graphite sheet with absorbent cotton dipped in ethanol, and dry it in an oven at 110°C for 30 minutes. Clean the metal base with dilute hydrochloric acid with a concentration of 3mol / L to remove surface oxides, clean it with an ultrasonic cleaner for 10 minutes, and dry it with hot air from a hair dryer. Mix 60% tin-bismuth solder paste, 20% high-grade resin, 10% spherical graphite powder, 5% copper powder, and 5% curing agent to form solder. ...

Embodiment 3

[0034] Embodiment 3: After cleaning the graphite sheet, soak the graphite sheet with dilute hydrochloric acid for 1 to 3 minutes, wash it with water or ethanol, put the graphite sheet into the magnetron sputtering coating machine after drying, and control the vacuum degree to be 10 -0.1Pa, carry out copper plating, the thickness of the coating is 10μm, cut it into the desired shape after plating, and dry it in an oven at 90°C for 2 hours. Wipe the graphite sheet with absorbent cotton dipped in ethanol, and dry it in an oven at 110°C for 30 minutes. Clean the metal base with dilute hydrochloric acid with a concentration of 3mol / L to remove surface oxides, clean it with an ultrasonic cleaner for 10 minutes, and dry it with hot air from a hair dryer. Mix 40% tin-bismuth solder paste, 25% high-grade resin, 20% spherical graphite powder, 10% copper powder, and 5% curing agent to form solder. Put the solder into the groove of the base, insert the graphite fin, and put it into the r...

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PUM

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Abstract

The invention discloses a graphite radiating module and a manufacturing process thereof. The manufacturing process is characterized by comprising the following steps: firstly, plating a metal clad layer with the thickness of 10 to 30 mu m on the surface of a graphite radiating fin; secondly, cleaning and drying a base and the radiating fin respectively; thirdly, putting a novel low-temperature tin cream and the graphite radiating fin into a groove of the metal base; and finally, obtaining the graphite radiating module by adopting a reflow soldering or gear shaping process. Compared with the prior art, the manufacturing process has the advantages that: a graphite sheet can be welded with a metal easily, the joint has strong weld strength and good heat conductivity, and a radiating device is firm and durable with good heat resistance, so a graphite material can be more widely and more conveniently applied to heat management devices of electronic components.

Description

field of invention [0001] The invention relates to a graphite heat dissipation module and its manufacturing process, in particular to a heat dissipation module for lead-free welding process and gear slotting process between graphite heat dissipation fins and heat-absorbing substrates used for heat dissipation of electrical appliances, so as to meet the requirements of graphite heat dissipation. Incorporation of fins instead of metal fins is a standard process. Background technique [0002] The classification of graphite in crystallography is hexagonal system, which is composed of many superimposed carbon atom network layers. The carbon atoms in each layer are arranged in a regular hexagon, and three adjacent carbon atoms are connected by covalent bonds to form a network plane (called the basal plane) that extends infinitely in two-dimensional space, and the van der Waals force acts between the layers. . The lattice structure of graphite determines that graphite has special...

Claims

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Application Information

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IPC IPC(8): G12B15/06C23C14/35C23C14/18C23C18/31C25D3/02C25D5/54B23K1/00B23K1/20B23K35/22B23K35/26B23K1/008B23P11/02
Inventor 耿世达
Owner DALIAN LICHANG NEW MATERIAL CO LTD
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