Carbon Fiber Mat Definition
Carbon fiber felt is a two dimensional material produced from carbon fibers using weaving and molding techniques.
It is characterized by high strength, low weight, high temperature resistance, and excellent electrical and thermal conductivity.
Widely applied in fields such as aerospace, automotive manufacturing, the electronics industry, semiconductors, and photovoltaics.
Carbon fiber felt possesses highly efficient adsorption capabilities.
As a thermal insulation material, it is easily molded, resistant to fragmentation, and offers robust thermal insulation performance.
As an adsorbent material, it exhibits a large adsorption capacity and rapid adsorption kinetics for both organic vapors and inorganic gases.
The density of carbon fiber felt typically ranges from 0.25 to 0.7 g/cm³, and it can withstand temperatures reaching 1600–1700°C.
Carbon Fiber Mat Preparation Process
The production process for carbon fiber felt involves impregnation and drying, carbonization, activation, and slitting and winding.
During the impregnation and drying stage, the raw material is immersed in an aqueous solution of diammonium phosphate and subsequently dried.
The carbonization stage is conducted at approximately 300°C, utilizing nitrogen as a protective atmosphere.
The activation stage takes place at around 1400°C, with steam introduced to increase the specific surface area;finally, the material undergoes slitting and winding.
Distinction Between Rigid and Flexible Felt
Flexible felt is manufactured by winding and forming pre oxidized fibers; it is pliable enough to be rolled up for transport.
It features a density of 0.08–0.15 g/cm³ and a thickness of 3–20 mm.
Rigid felt is formed either through vacuum filtration or integral needle-punching.
It exhibits excellent resistance to delamination, and its service life is more than 50% longer than that of flexible felt.
Carbon Fiber Mat Common Preparation Methods
Common methods for preparing carbon fiber felt include air-laid web formation of carbon staple fibers followed by needle-punching;
carbonization of pre oxidized fiber felt;
and the pre oxidation and carbonization of polyacrylonitrile (PAN) fiber felt.
The “Air laid Web Formation and Needle punching” method refers to a process in which air laid web technology is used to create a multi layered carbon fiber mat,
which is then subjected to needle punching, compression, resin impregnation,
and carbonization to produce a carbon fiber material with a three dimensional (3D) network structure.
Carbon Fiber Mat Safety Information
The safe use of carbon fiber felt requires careful consideration of its operating environment,
physical parameters, and the specific hazard characteristics of the particular product type.
Its maximum safe operating temperature varies depending on the surrounding atmosphere:
In an inert gas environment, the maximum temperature can reach 2650°C;
in air, it is approximately 350°C; and in a vacuum, it is approximately 1800°C.
Key physical parameters include a bulk density ranging from 0.08 to 0.17 g/cm³ and a porosity of approximately 90%.