Polyacrylonitrile (PAN)-based graphite felt - a good conductor of electricity and heat
Jun 25,2025
What is polyacrylonitrile (PAN)-based graphite felt?
PAN fiber: Made from the polymerization and spinning of acrylonitrile, it resembles white plastic filaments.
After multiple high-temperature carbonization processes:
Pre-oxidation: Heating in air at 200-300℃ to cross-link and stabilize the fiber molecular chains, preventing melting during high-temperature carbonization.
Carbonization: Heating in an inert gas (such as nitrogen) to 1000-1500℃, volatilizing non-carbon elements (H, O, N) in the fiber to form a disordered carbon structure.
Graphite: Further processing at 2500-3000℃ to arrange carbon atoms into a regular graphite structure, improving electrical and thermal conductivity.
What are the characteristics of polyacrylonitrile (PAN)-based graphite felt?
High-temperature resistance
At high temperatures, stainless steel begins to redden and soften at 800℃, and ceramic fibers shatter upon contact at 1600℃, but polyacrylonitrile (PAN)-based graphite felt can maintain its shape at 3000℃ in an inert gas environment.
Lightweight and high strength
The tensile strength is 2-3 times that of viscose-based graphite felt, with a density of only 0.2-0.4g/cm³, lighter than aluminum alloy.
Electrical and thermal conductivity
Electrical conductivity is close to that of metallic copper, with a thermal conductivity as high as 100-200W/(m·K), 3-5 times that of viscose-based felt.
Corrosion resistance
Resistant to strong acids, strong alkalis, and organic solvents.
High processability
It can be cut, needled, and layered to create various shapes.
What are the applications of polyacrylonitrile (PAN)-based graphite felt?
Industrial field
Single crystal silicon smelting furnaces, producing products such as mobile phone chips.
New energy field
Used as a gas diffusion layer in hydrogen fuel cells, improving vehicle range.
Power field
Flexible electric heating film, fast heating, uniform heat generation, low power consumption. It can also be used to make heat sinks.
The raw material cost of polyacrylonitrile (PAN)-based graphite felt is higher than that of viscose-based graphite felt, due to the higher price of PAN fiber. The tensile strength of PAN-based graphite felt is 200-500 MPa, stronger than viscose-based graphite felt. PAN-based graphite felt has stronger electrical conductivity, making it more suitable for heat dissipation scenarios.
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