Graphene is a new material
with carbon atoms tightly packed into a single-layer two-dimensional honeycomb lattice structure by sp2 hybridization.
It is considered to be the basic building block
of carbon materials such as fullerenes, carbon nanotubes, and graphite.
Compared with other carbon materials, graphene has a perfect large π conjugated system and the thinnest monolayer atomic thickness structure, which makes graphene exhibit excellent and unique properties in optical, electrical, thermal, and mechanical aspects, including high electrical conductivity (electron mobility up to 2×105 cm2/(V·s)), high strength (Young's modulus up to 1 TPa), high thermal conductivity (5300 W/(m·K)), extremely high surface area (2630 m2/g), excellent thermal stability , strong hydrophobicity and other characteristics, so that it has a good application prospect
in the field of functional coating materials.
Graphene heat dissipation coating
Heat dissipation coating is a special industrial coating
that improves the heat dissipation speed and efficiency of the surface of the object and reduces the surface temperature of the material.
Heat is transferred through four main methods: conduction heat dissipation, convection heat dissipation, radiation heat dissipation, and evaporative heat dissipation, and the temperature
of the substrate is reduced.
Due to the rapid development of material science and engineering, the design and production of test instruments, production equipment, and parts are developing in the direction of lightweight, miniaturization, integration and efficiency, especially the rapid development of ultra-large-scale integrated circuits, making the high power density characteristics of electronic devices more and more obvious, so that the large amount of heat generated on the surface of electronic devices will directly affect the working stability and service life
of electronic devices.
At present, the effect of conventional cooling systems and heat dissipation materials has been greatly challenged, and the same problems appear in the fields of automobiles, new energy, military, nuclear industry, agriculture, chemical industry, electronic communications, and information engineering
.
The general heat dissipation coating is based on polymer, and then some metal fillers with good thermal conductivity are added including traditional gold, copper, aluminum, etc.
, as well as some non-metallic fillers with high thermal conductivity such as aluminum nitride, silicon nitride, alumina, beryllium oxide, magnesium oxide, carbon fiber, silicon carbide, carbon nanotubes, etc
.
Graphene nanocoating material is a composite coating made by adding graphene to the existing coating system, which has excellent thermal conductivity and heat dissipation performance
.
Coating graphene coating on metal substrates can greatly improve its thermal radiation coefficient and accelerate heat exchange efficiency.
At the same time, the unique sheet structure of graphene makes the coating have better anti-corrosion performance, which greatly improves the service life
of the product.
Graphene heat dissipation coating, used in metal components, greatly increases the thermal conductivity efficiency, graphene coating thermal conductivity is greatly improved compared with ordinary coatings, and can retain good mechanical properties
.
In recent years, many researchers have applied graphene composite coatings to the field of thermal conductivity and heat dissipation, and thousands of articles and patents have been published
every year.
After painting, graphene coating can greatly improve the thermal radiation coefficient of the substrate and reach the thermal emission coefficient above 0.
95 (the theoretical value is close to 1), which greatly accelerates the heat exchange efficiency
.
Graphene radiation heat dissipation cooling coating can take away the heat on the surface of the substrate in the form of 1~13.
5μm wavelength radiation, reduce the surface temperature of the device, improve the service life and stability of the device, compared with other thermal fillers in granular form, it is easier to form a thermal conduction network, and the effect of strengthening and toughening the coating is obvious
.
Source: Chemical Industry Journal
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