Hunan MTR Co., Ltd.
Hunan MTR Co., Ltd.
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Graphite Hard Felt - Cylinder
Features:
Excellent ablation resistance
Thermal shock resistance
Airflow erosion resistance and thermal insulation performance.
Graphite Hard Felt has the advantages of high rigidity, self-supporting, high strength, no short fiber drop, low thermal conductivity, and other advantages that traditional thermal insulation materials do not have.
| Product Type: | Thermal insulation Cylinder |
| Material: | Polyacrylonitrile |
| Category: | Graphite Hard Felt |
| Grade: | A customized processing |
| Thermal conductivity: | 0.15-0.25 |
| Refractory temperature: | above 2000 ℃ |
| Core material: | polyacrylonitrile |
| Form: | Microporous |
| Material thickness: Tube diameter: Tube height: Tube wall thickness: | 5-300mm φ100-2500mm 100-3000mm 5-150mm |
| temperature | Operating temperature in air: < 350 ℃ Working temperature in vacuum: < 2200 ℃ Operating temperature in atmosphere: < 3000 ℃ |
| Carbon content: | above 98% |
Graphite Felt Application:
1. Aerospace industry: hot isostatic pressing furnace, heat treatment, sintering, brazing, hot pressing furnace
2. Semiconductor industry: drawing silicon single crystal furnace, vacuum metallurgy
3. Metal heat treatment: heat treatment furnace, sintering furnace, brazing furnace
4. Carbon fiber production: induction heating or resistance heating carbonization furnace, graphitization furnace
5. The production of composite materials: pyrolytic carbon and pyrolytic graphite, chemical vapor deposition, or other composite materials
6. Energy materials: vanadium or other redox battery materials
Physical and chemical indicators:
| main material | PAN-CF / asphalt-CF / viscose-CF | Sheet specifications | length(mm) | 10-3000 |
| Bulk density(g/CM3)) | 0.22-0.28 | width(mm) | 10-2000 | |
| Thermal conductivity | 0.15-0.25(25℃)0.40-0.45(1400℃)
| thickness(mm) | 5-300 | |
|
Barrel specifications | diameter(Φ) | Φ100-Φ2500 | ||
| Carbon content(％) | ≧99 | Wall thickness(T) | 5-150 | |
| bending strength(Gpa) | 1.5-3.2 | Tube height | 100-3000 | |
| Flexural strength(Gpa) | 1.0-2.5 |
Use environment | air(℃) | ≦350 |
| ash content(ppm) | ≦200 | vacuum(℃) | ≦2200 | |
| Processing temperature | First≧1800 Second≧2200 | Inert atmosphere(℃) | ≦3000 |
Temperature resistance: 1800 ℃ in vacuum, 2850 ℃ in inert gas
Hunan MTR New Material Technology Co., Ltd. has perfect production technology and equipment, we can customize products of various sizes and shapes to meet your needs for various vacuum and high temperature furnace insulation materials. Sincerely welcome your inquiries.
Asphalt represented by Japan Kureha is the mainstream in the insulation industry.
Insulation felts in Europe and the United States are basically based on viscose, while most of China uses polypropylene as the raw material.
The process is to cut the polyacrylonitrile-based carbon felt or viscose-based carbon felt into the required size, roll it into a tube and put it into a container made of graphite material, and place the graphite container in a high-temperature furnace (the high-temperature furnace is a graphite tube furnace, intermediate frequency , High-frequency induction furnace or other high-temperature furnaces with the heating method), with protection of vacuum or high-purity inert gas , heating to 2200 ～ 2500 ℃ at a heating rate of 100 ～ 300 ℃ / h, then naturally cool to 100 ℃ .
Polyacrylonitrile-based graphite felt is stronger and more resistant to oxidation than viscose-based graphite felt, but it has poor flexibility, large bulk density, and good thermal insulation performance. In addition to their high purity, high-temperature resistance, corrosion resistance, and non-melting characteristics,
they also have the advantages of elasticity, foldability, tailoring, and sewing with graphite yarn. The main use of graphite felt is as a thermal insulation material for single crystal silicon smelting furnace. In the chemical industry,
it can be used as a filter material for high purity corrosive chemical reagents. Under the non-oxidizing atmosphere, the temperature of graphite felt can reach 2850℃.