Graphite Solutions for Tomorrow's Innovations
Rigid graphite felt has excellent ablative resistance, thermal shock resistance, airflow erosion resistance, good high temperature insulation effect and high temperature stability, etc. It is widely used in most high-end markets, including solar energy industry, semiconductor monocrystalline silicon industry, artificial crystal industry, optical fiber industry, high temperature vacuum sintering furnaces, heat treatment furnace, etc.
Rigid graphite felt is a thermal insulation material that is based on soft graphite felt and then formed by using a small amount of binder to composite any shape (for example, barrel, disk, cuboid) after high-temperature graphitization treatment. It can effectively improvs the original working environment and operability. Besides, it can also have different surface coating treatments upon request to meet the needs of various applications. Compared with soft felt, its fume forming rate is significantly reduced, thereby extending its service life.
Rigid graphite felt is generally divided into pitch-based rigid graphite felt, PAN-based rigid graphite felt and rayon-based rigid graphite felt.In addition to rigid felt based on soft graphite felt, we also have a new type of rigid graphite felt made from a laminated material composed of fiber filaments and binder, which is then graphitized at high temperatures to form a complete felt.
In addition, we provide comprehensive vacuum furnace hot zone maintenance solutions, including graphite groove plate, rigid graphite felt, soft graphite felt, carbon-carbon composites and other high performance parts to ensure efficient and reliable equipment operation under high temperature environments.
It is made from high-quality PAN-based carbon felt that has been graphitized. It is used in the protective atmosphere and insulation of vacuum furnaces, and features high temperature resistance, corrosion resistance, low thermal conductivity, etc. Surfaces and edges are sealed to reduce the porosity and increase the oxidation resistance. Besides, it can be layered internally to improve radiation heat retention and reduce the furnace contaminant. It often serves as the insulation layer of industrial furnaces including single crystal furnaces, carbonized furnaces, quartz furnaces, vacuum furnaces, induction furnaces, high-frequency furnaces and reaction heat balance, heat treatment furnaces, sintering furnaces, welding furnaces. Moreover, it can also be used as a corrosion-resistant filter material.
| Model | Heat Treatment Temperature | Carbon Content | Density (g/cc) | Ash (ppm) | Surface Treatment | Shape |
|---|---|---|---|---|---|---|
| CRF-1 Carbonized Rigid Felts | 1200 °C | ≥ 97% | 0.2–0.35 | ≤ 500 | Graphite foil coated; CFC (Carbon Cloth) coated; Anti-oxidation painting | Graphite rigid board: Thickness 20–600 mm; Graphite Cylinder: Diameter: up to 1500–1800 mm |
| GRF-1 Graphite Rigid Felts | 2200 °C | ≥ 99% | 0.16–0.32 | ≤ 200 | ||
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It is used in the protective atmosphere and insulation of vacuum furnaces. It can be easily cut or machine-customized to desired sizes and is suitable for square and circular hot zones. Surfaces and edges are sealed to reduce the porosity and increase the oxidation resistance. A foil can be added to the surface of graphite felt that can be layered internally to improve radiation heat retention and reduce the furnace contamination. It is widely used in vacuum furnaces, powder metal sintering, sputtering targets, CVD, CVI and CVR furnaces, carbon fiber heat treatment furnaces, silicon/GaAs crystal growing furnaces, annealing and hot pressing, and fiber optics production.
| Model | Heat Treatment Temperature | Carbon Content | Density (g/cc) | Ash (ppm) | Surface Treatment | Shape |
|---|---|---|---|---|---|---|
| CRF-2 Carbonized Rigid Felts | 1200 °C | ≥ 98% | 0.15–0.30 | ≤ 500 | Graphite foil coated; CFC (Carbon Cloth) coated; Anti-oxidation painting | Graphite rigid board: Thickness 20–600 mm; Graphite cylinder: Diameter: up to 1500–1800 mm |
| GRF-2 Graphite Rigid Felts | 2200 °C | ≥ 99% | 0.12–0.25 | ≤ 200 | ||
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It is made of It is made of asphalt carbon fiber mat hardened and compounded asphalt carbon fiber with certain rigidity, self-supporting property, low density, no short fiber shedding, and excellent insulation efficiency. It is widely used as insulation material for various high-temperature vacuum furnaces including vacuum heat treatment furnaces, sintering furnaces, melting furnaces, and recrystallization furnaces. It has a long service life and is easy to install and remove.
| Model | Carbon Content | Thermal Conductivity (W/m·K) Nitrogen Environment1000 °C | Compressive Strength (MPa) | Flexural Strength (MPa) | Bulk Density (g/cm3) | Ash Content | Treatment Temperature |
|---|---|---|---|---|---|---|---|
| GAF-1 | > 99.80% | 0.20 - 0.27 | 0.17–0.6 | 1.0–1.8 | 0.15–0.30 | < 0.1% | 2000 °C |
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