Resin impregnated graphite is a mechanical graphite material that uses synthetic resin as an impregnant to fill the surface and internal pores of graphite, and then carbonized the resin through heat treatment. Its core feature is that the graphite particles or sheets are combined with the matrix material through the bonding effect of the resin, thereby improving the mechanical properties and durability of the material. The following is a comprehensive introduction to resin graphite:
Basic definition and structure of Resin impregnated graphite:
Composition of Resin impregnated graphite:
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It is composed of graphite (carbon material) and resin (such as phenolic resin, epoxy resin, etc.). Graphite provides electrical conductivity, thermal conductivity and other properties, while the resin is responsible for bonding and strengthening the structure.
Structural characteristics:
Depending on the application requirements, resin graphite can present block, flake or fibrous structures, and the specific form depends on the production process and formula.
Resin impregnated graphite is a composite material prepared by chemical impregnation and heat treatment. Its core feature is that the surface and internal pores of graphite are filled with synthetic resin, and then the resin is solidified by heat treatment, thereby improving the mechanical strength and corrosion resistance of graphite. The following is a detailed analysis:
Process flow:
Impregnation treatment: The graphite material is immersed in a solution containing synthetic resin, and the resin penetrates into the pores of the graphite.
Heat treatment: The impregnated sample is treated with high temperature (usually 150-250℃) to completely carbonized the resin and form a dense structure.
Performance characteristics of resin impregnated graphite:
Improved mechanical properties:
A dense structure can be formed through the impregnation process to further improve the mechanical properties. After impregnation, the hardness, impact resistance and wear resistance of the graphite are significantly improved, and the mechanical strength can be increased by 2-3 times.
Enhanced corrosion resistance:
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It has excellent tolerance to corrosive media such as acids and alkalis, can work stably in a high temperature environment of 350℃-400℃, and has better corrosion resistance than natural graphite.
Maintain thermal conductivity:
Although the mechanical properties are improved, the thermal conductivity is close to that of natural graphite, which is the best among non-metallic materials (the thermal conductivity is 2 times that of carbon steel and 7 times that of stainless steel). The electrical conductivity and thermal conductivity of graphite are retained, while the linear expansion coefficient is improved by resin to reduce thermal stress.
Enhanced sealing performance:
The electrical and thermal conductivity of graphite is retained, and it is impermeable after being impregnated with resin and cured, which is more suitable for applications that require sealing.
Processing and cost of resin impregnated graphite:
It can be mass-produced, with low cost, and is suitable for large-scale applications.
Application fields of resin impregnated graphite material:
Industrial equipment:
It is mainly used in chemical equipment (such as phosphoric acid reaction tanks, storage tanks), high-temperature heat transfer devices and brush materials.
New energy field:
It also has application potential in emerging fields such as lithium battery negative electrode materials and high-temperature sensors.
Common material types of impregnated resin graphite::
Phenolic impregnated graphite: resistant to acid and alkali corrosion, suitable for moderately corrosive environments.
Furan impregnated graphite: better high temperature resistance, suitable for high temperature scenes.
Advantages and limitations of resin impregnated graphite
Advantages: significant improvement in comprehensive performance and flexible processing technology.
Limitations: Thermal conductivity is still lower than that of metal, and resin aging may occur at high temperatures.
In summary, resin impregnated graphite achieves a balance between mechanical strength and corrosion resistance of graphite through chemical modification, and is a high-performance material widely used in the industrial field.
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