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Boron nitride/graphene composite material, its preparation, surface protective coating composition comprising same, and use

A technology of protective coatings and composite materials, applied in the direction of coatings, anti-corrosion coatings, etc., can solve the problems of not taking into account both anti-corrosion and decorative functions, long preparation cycle, low thermal conductivity, etc., to improve reliability and service life , reduce the surface temperature, increase the effect of specific surface area

Active Publication Date: 2022-07-29
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing method has a long preparation cycle, complicated process, and high cost. In addition, the powder has high infrared emissivity and low thermal conductivity. It cannot simultaneously solve the problem of heat dissipation and anti-corrosion and decoration functions.

Method used

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  • Boron nitride/graphene composite material, its preparation, surface protective coating composition comprising same, and use
  • Boron nitride/graphene composite material, its preparation, surface protective coating composition comprising same, and use
  • Boron nitride/graphene composite material, its preparation, surface protective coating composition comprising same, and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The preparation method of boron nitride / graphene composite material comprises the following steps:

[0054] Weigh an appropriate amount of boron nitride and magnesium powder and mix them evenly. The mass ratio of boron nitride and metal magnesium powder is 7:1. The mixed powder is put into a reaction kettle, and the reaction device is evacuated and then poured into carbon dioxide gas. , the pressure of carbon dioxide gas is 0.5MPa, and the reactant is heated and ignited with a tungsten wire. After ignition, the reactant continues to burn until the combustion synthesis reaction is completed. After the synthesis product is taken out, it is crushed and placed in the combustion synthesis powder. Carry out pickling in hydrochloric acid with a mass percentage of 10-25%, until the pH value of the pickling solution is less than 5, rinse with distilled water repeatedly, until the rinse solution is the center, and dry under normal pressure to obtain boron nitride / Graphene compos...

Embodiment 2

[0064] The preparation method of boron nitride / graphene composite material comprises the following steps:

[0065] First weigh an appropriate amount of boron nitride with an average particle size of 8 microns and a magnesium powder with an average particle size of 1 micron and mix them evenly. The mass ratio of boron nitride and metal magnesium powder is 8:1, and the mixed powder is loaded into a reactor. The reaction device is evacuated and then charged into carbon dioxide gas. The pressure of carbon dioxide gas is 1MPa. The reactant is heated and ignited with a tungsten wire. After ignition, the reactant continues to burn until the combustion synthesis reaction is completely carried out. After crushing, put the synthetic powder into the 10-25% hydrochloric acid for pickling. After the pH value of the pickling solution is less than 5, rinse it repeatedly with distilled water until the washing solution is the center, at normal pressure. After drying, the boron nitride / graphene...

Embodiment 3

[0073] The preparation method of boron nitride / graphene composite material comprises the following steps:

[0074] First weigh an appropriate amount of boron nitride with an average particle size of 10 microns and magnesium powder with an average particle size of 1 micron and mix them evenly. The mass ratio of boron nitride and metal magnesium powder is 6:1, and the mixed powder is loaded into a reactor , evacuating the reaction device and then rushing into carbon dioxide gas, the pressure of carbon dioxide gas is 1MPa, the reactant is heated and ignited with a tungsten wire, after ignition, the reactant continues to burn until the combustion synthesis reaction is completely carried out, after the synthesis product is taken out, After pulverization, put the synthetic powder in combustion into 10-25% hydrochloric acid for pickling. After the pH value of the pickling solution is less than 5, rinse it repeatedly with distilled water until the washing solution is the center. Press...

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Abstract

The invention discloses a boron nitride / graphene composite material, which is composed of graphene and boron nitride, and the graphene is grown on the surface of the boron nitride in situ; in the composite material, the quality of the graphene is 100%. The sub-content is 2.5-3%, and the balance is boron nitride. The composite material has low cost, and has the characteristics of high thermal conductivity and high infrared emissivity radiation. When it is used in a coating composition, it can improve the heat dissipation of the coating composition and take into account the functions of anticorrosion and decoration. The invention also discloses a preparation method thereof, a surface protective coating composition comprising the composite material and its application.

Description

technical field [0001] The invention relates to the technical field of radiation refrigeration coatings. More specifically, it relates to a boron nitride / graphene composite material, its preparation, a surface protective coating composition comprising the same and its use. Background technique [0002] With the increasing integration and power density of power electronic devices, the heat flux density of electronic devices is getting higher and higher. At present, the chip-level heat flux density has exceeded 1Kw / cm 2 , the local hot spot even reaches 30Kw / cm 2 . Statistics show that 55% of the failure rate of electronic equipment is due to excessive temperature, and the failure rate can increase by more than 4% for every 1 °C increase in its temperature from the normal level, and when the temperature rise exceeds a certain value, the failure rate will be The index regularly climbs. With the rapid development of GaN-based blue LED core growth technology, the luminous ef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/08C09D7/61C09D183/04
CPCC09D5/08C09D7/61C09D183/04C08K2003/385C08K3/38C08K3/042
Inventor 李永李江涛杨增朝贺刚杨潇双爽
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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