Thermal-conducting fiber reinforced high-thermal-conductivity graphite radiating fin and preparation method thereof

A high thermal conductivity graphite, graphite heat sink technology, applied in heat exchange equipment, heat exchange materials, lighting and heating equipment, etc., can solve the problem of pure thermal conductivity graphite sheet strength and mechanical properties are not good enough, it is difficult to meet the requirements of use, and graphite dust falls off. and other problems, to achieve the effect of easy subsequent processing, light weight and enhanced strength

Active Publication Date: 2013-03-20
TIANNUO PHOTOELECTRIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional graphite heat sink processing method only uses a single graphite powder, or uses carbon black, boron nitride, copper powder, etc. to be filled with graphite particles. It is easy to cause graphite dust to fall off under heavy work, and the strength is small, the mechanical properties are poor, and it is difficult to meet the use requirements
The strength and mechanical properties of pure thermally conductive graphite sheets are far inferior to metals, which brings difficulties to subsequent processing
At the same time, due to the disadvantage of graphite being fragile, it will cause problems such as complicated operation and easy damage during use.

Method used

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  • Thermal-conducting fiber reinforced high-thermal-conductivity graphite radiating fin and preparation method thereof
  • Thermal-conducting fiber reinforced high-thermal-conductivity graphite radiating fin and preparation method thereof
  • Thermal-conducting fiber reinforced high-thermal-conductivity graphite radiating fin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The natural flake graphite powder with a carbon content of 99.2%, a particle size of 180 μm and a graphite short fiber with a diameter of 10 μm and a length of 3 mm are selected, and the mass ratio of the flake graphite powder to the graphite short fiber is 1000:1. Put the natural flake graphite powder into the acid treatment solution for chemical treatment and impurity treatment. The processed flake graphite powder is washed with water, dried, and then placed in a graphite expansion furnace for high temperature expansion, and the high temperature expanded flake graphite The powder is produced by graphite coil production equipment to produce a graphite heat-conducting heat dissipation plate with a density of 1.2g / cm3 and a thickness of 0.1mm. Then mix the graphite short fibers in the pressure-sensitive adhesive, stir and disperse them with a high-strength disperser, and spray them evenly on the graphite heat sink. After they are completely dried, they will quickly adhere ...

Embodiment 2

[0048] The natural flake graphite powder with a carbon content of 99.5% and a particle size of 180 μm and a carbon fiber with a diameter of 10 μm and a length of 5 mm are selected, and the mass ratio of the flake graphite powder to the carbon fiber is 2:1. The natural flake graphite powder is put into an acid treatment solution for chemical treatment and impurity treatment, the treated graphite powder is washed with water, dried, and then put into a graphite expansion furnace for high temperature expansion. The expanded graphite powder is made into a graphite heat-conducting heat dissipation plate with a degree of 1.2g / cm3 and a thickness of 0.3mm through graphite coil production equipment. Then mix the carbon fiber in the pressure-sensitive adhesive, stir and disperse it evenly with a high-strength disperser, and spray it evenly on the graphite heat sink. After it is completely dried, it will be quickly bonded to the bonding surface of another graphite heat sink. And a certain...

Embodiment 3

[0050] The natural flake graphite powder and carbon fiber cloth with a carbon content of 99.5% and a particle size of 250 μm are selected, and the mass ratio of the flake graphite powder to the carbon fiber cloth is 500:1. Put the natural flake graphite powder into the acid treatment solution for chemical treatment and impurity treatment. The processed flake graphite powder is washed with water, dried, and then placed in a graphite expansion furnace for high temperature expansion. The expanded flake graphite powder Graphite coils are used to produce graphite heat-conducting heat sinks with a density of 1.5g / cm3 and a thickness of 0.5mm. Then coat one side of the prepared graphite heat sink with water-based pressure-sensitive adhesive evenly. After it is completely dried, quickly coat the carbon fiber cloth on the pressure-sensitive adhesive, and then paste the other graphite heat sink coated with pressure-sensitive adhesive. Put it on top and apply a certain pressure to finally...

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Abstract

The invention provides a thermal-conducting fiber reinforced high-thermal-conductivity graphite radiating fin and a preparation method thereof. The preparation method of the thermal-conducting fiber reinforced high-thermal-conductivity graphite radiating fin comprises the following steps: carrying out pretreatment on graphite powder; processing the graphite powder subjected to pretreatment by using a graphite coiled material production device, thereby obtaining a thermal-conducting graphite radiating plate; and taking short graphite fibers, carbon fiber cloth and carbon fibers as a reinforcing agent, and carrying out coating and laminating on the thermal-conducting graphite radiating plate and the reinforcing agent by using an adhesive so as to obtain the thermal-conducting fiber reinforced high-thermal-conductivity graphite radiating fin. According to the preparation method of the thermal-conducting fiber reinforced high-thermal-conductivity graphite radiating fin, the defects of low mechanical properties, short service life and easy falling and the like existing in the conventional preparation process can be overcome, and the mechanical strength and the purity of the radiating fin are greatly improved, thereby facilitating subsequent processing; and the radiating fin has the advantages of light weight, high strength, high thermal conductivity, and the like, and enlarges the application range of graphite flakes.

Description

Technical field [0001] The invention relates to a preparation method of a graphite heat sink, in particular to a preparation method of a heat-conducting fiber reinforced high thermal conductivity graphite heat sink. Background technique [0002] With the rapid development of microelectronic integration technology and high-density printed board assembly technology, the assembly density is rapidly increasing, and the volume of electronic components and logic circuits has shrunk thousands of times. Electronic instruments and equipment are becoming lighter, thinner, shorter and smaller. Direction development. Under the high frequency operating frequency, the semiconductor working thermal environment rapidly moves to the high temperature direction. At this time, the heat generated by the electronic components rapidly accumulates and increases. Under the ambient temperature, the electronic components should still work normally with high reliability , Timely heat dissipation capacity h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/04B32B7/12B32B37/15B32B37/12
CPCB32B37/12C09K5/14B32B37/10H05K7/20H01L23/373F28F3/02F28F21/02H01L23/3733H01L2924/0002
Inventor 宫以娟朱焰焰
Owner TIANNUO PHOTOELECTRIC MATERIAL
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