Henan E-Grind Abrasives Co., Ltd.
Henan E-Grind Abrasives Co., Ltd.

High Thermal Conductivity Material

Previous metal (aluminum, copper) heat dissipation parts due to the existence of high density, high coefficient of thermal expansion, material impurity and other problems, it is difficult to meet the needs of heat dissipation. With the rapid development of science and technology, more and more attention has been paid to heat dissipation in aerospace, satellite communication, high-speed computer and other fields, and higher requirements have been put forward for thermal management materials.

Because of its low density, high strength, high thermal conductivity, chemical corrosion resistance and other characteristics, carbon materials are expected to replace the previous metal materials to become a new generation of high thermal conductivity materials.

The heat conduction of carbon materials is mainly realized through the thermal vibration of lattice atoms. The type of carbon fiber, the type of matrix, the density, the specific heat capacity, the degree of graphitization, the prefabricated structure, the volume fraction of fiber, the heat treatment temperature/graphitization temperature are the main factors affecting the thermal conductivity of carbon materials.

At present, the classification of carbon materials with high thermal conductivity mainly includes the following three kinds:

1. Diamond material

At present, natural diamond has the highest known thermal conductivity among natural materials, and its thermal conductivity at room temperature is about 2000 to 2100W/ (m∙K). At the same time, diamond is also a good insulator, is an ideal substrate heat dissipation material. At present, the crystal carbon film prepared by chemical vapor deposition has the advantages of high quality and low cost.

2. Graphite material

Graphite is composed of six edges and two densely row base planes, belonging to the hexagonal structure, mainly divided into natural graphite and artificial graphite two categories. The thermal conductivity of ordinary graphite at room temperature is only 70 to 150W/ (m∙K), while the thermal conductivity of natural graphite on the 002 crystal surface can reach 2200W/ (m∙K) at room temperature, and the thermal conductivity of highly oriented cracked graphite on its surface can also reach 2000W/ (m∙K).

3. Graphene materials

Graphene material consists of a single layer of carbon atoms in a two-dimensional plane structure composed of regular hexagons closely arranged in a honeycomb shape. It is a single layer of carbon atomic surface material stripped from graphite. Micromechanical stripping, epitaxial growth, chemical vapor deposition and graphene oxide chemical reduction are the main preparation methods of graphene. The thermal conductivity of single suspended graphene at room temperature can reach 3000 to 5300W/ (m∙K).

Carbon atoms are arranged in a special way, and the commonly used carbon materials have a huge structure and anisotropy of thermal conductivity, that is, they have a high thermal conductivity in the direction of graphite crystal faces, but a small thermal conductivity between crystal faces. The preferred orientation in the process of material preparation limits its thermal conductivity in the direction of thickness.

Still, the advantages of carbon materials cannot be ignored. The heat management material with its checks and balances is especially suitable for the heat dissipation of small space large heat flux components, which can meet the development requirements of the next generation of electronic components, and is of great significance to the development of modern industry, national defense and high technology.


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