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High heat conductivity reinforced graphite composite material and preparation method thereof

A technology of high thermal conductivity and composite materials, applied in the field of thermally conductive composite materials, can solve problems such as weak bonding force, and achieve the effects of excellent thermal conductivity, high thermal conductivity and simple preparation method

Inactive Publication Date: 2009-03-25
晟茂(青岛)先进材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Natural flake graphite has high chemical stability, good temperature shock resistance, corrosion resistance, excellent thermal conductivity, electrical conductivity and self-lubricating properties; The binding force is weak, and it is easy to insert heterogeneous atoms and ions between graphite layers, and form graphite interlayer compounds with carbon atoms

Method used

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  • High heat conductivity reinforced graphite composite material and preparation method thereof
  • High heat conductivity reinforced graphite composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Adopt chemical method to prepare expanded graphite, the used fine natural flake graphite of this example, its particle size is 300 μ m, purity is 99.5%, and intercalation agent adopts the concentrated sulfuric acid that concentration is 98%, and addition ratio is graphite: concentrated sulfuric acid=1: 2.5 (weight ratio), the oxidizing agent adopts 35% hydrogen peroxide, and the addition ratio is graphite: hydrogen peroxide=1: 0.18 (weight ratio). Control the reaction temperature at 30-60°C, intercalation reaction for 40 minutes, then wash the intercalated product with water until the pH value is greater than 4, and then dry it at 100°C for 2 hours until the moisture content is less than 3%. Carry out high-temperature expansion treatment at high temperature to obtain expanded graphite with an expansion volume of 250ml / g.

[0023] The boron nitride used has a purity of 99.0% and a particle size of 300 μm. According to the ball-to-material ratio of 5:1, 50kg of grinding ...

Embodiment 2

[0035] Embodiment two: adopt chemical method to prepare expanded graphite, the used fine natural flake graphite of this example, its particle size is 178 μ m, and purity is 99.5%, and intercalation agent adopts the concentrated sulfuric acid that concentration is 98%, and addition ratio is graphite: concentrated sulfuric acid=1 : 2.5 (weight ratio), the oxidizing agent adopts 35% hydrogen peroxide, and the addition ratio is graphite: hydrogen peroxide=1: 0.20 (weight ratio). Control the reaction temperature at 30-60°C, intercalation reaction for 40 minutes, then wash the intercalated product with water until the pH value is greater than 4, and then dry it at 100°C for 2 hours until the moisture content is less than 3%. Carry out high-temperature expansion treatment at low temperature to obtain expanded graphite with an expansion volume of 200ml / g.

[0036] The boron nitride used has a purity of 99.0% and a particle size of 500 μm. According to the ball-to-material ratio of 5:...

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Abstract

The invention relates to a reinforced graphite composite material with high heat conductivity and a preparation method thereof; the reinforced graphite composite material with high heat conductivity is formed by expanded graphite with the weight percentage of 69.5 percent to 89.5 percent and nano boron nitride with the weight percentage of 10.5 percent to 30.5 percent. The preparation method of the reinforced graphite composite material with high heat conductivity comprises the steps: (1) intercalation is carried out to natural crystalline flake graphite; (2) a product after the intercalation is washed by water until the pH value is more than 4; (3) the product after washing is dried for 0.5 to 2 hours at the temperature of 60 to 120 DEG C; (4) high temperature swelling processing is carried out at the temperature of 800 to 1100 DEG C, and the time is not more than one minute; (5) uniform material distribution is carried out to the expanded graphite; (6) the nano boron nitride is uniformly sprayed on the expanded graphite with uniform material distribution; and (7) the reinforced graphite composite material with high heat conductivity can be obtained by prepressing and rolling of 4 to 6 times.

Description

technical field [0001] The invention relates to a heat-conducting composite material characterized by an inorganic base material, and also to a preparation method of nano-scale boron nitride, in particular to a production method of adding nano-scale boron nitride to a graphite plate. Background technique [0002] With the development of more and more complex electrical equipment, the equipment will generate relatively extreme temperatures during operation. These excessive heat can not only damage their own performance, but also reduce the performance and reliability of the entire system, and even cause system error. Therefore, it is imminent to develop a low-cost, high-efficiency, and light-weight heat dissipation product. Most of the current international electrical and electronic manufacturers use metal heat sinks, such as copper and aluminum as heat sinks, absorb heat from the heating appliances, and then transfer it to the entire structure, and then achieve heat dissipa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/536C04B35/626
Inventor 尹顺庆陈宣甫王京芹李保伍潘月秋杨金凤杨圣闯张鑫耿世达
Owner 晟茂(青岛)先进材料有限公司
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