Graphite Hard Felt - Cylinder

Packaging Details: Standard export carton or customized

Delivery time: 30 days

Payment Terms: Western Union

Supply Ability: 100,000kg per month

Features: Excellent ablation resistance, thermal shock resistance, airflow erosion resistance and thermal insulation performance. It 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.

Material: Polyacrylonitrile

Category: Graphite Hard Felt

Product Type: Thermal insulation Cylinder

Thermal conductivity: 0.15-0.25

Grade: A customized processing

Refractory temperature: above 2000 ℃

Core material: polyacrylonitrile

Form: Microporous

Material thickness: 5-300mm

Tube diameter: φ100-2500mm

Tube height: 100-3000mm

Tube wall thickness: 5-150mm

Operating temperature in air: < 350 ℃

Working temperature in vacuum: < 2200 ℃

Operating temperature in atmosphere: < 3000 ℃

Carbon content: above 98%

Density: 0.20-0.30g.cm3

Graphite hard felt (commonly known as carbon fiber composite hard felt, cured felt, carbon fiber-reinforced, etc.) is made by special process that integrates graphite paper, polyacrylonitrile-based carbon felt, and polyacrylonitrile-based carbon cloth into one body, curing After molding, then primary and secondary high temperature treatment. It has excellent ablation resistance, thermal shock resistance, airflow erosion resistance and thermal insulation performance. It 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.

It is mainly used in vacuum and various metallurgical industrial furnaces (single crystal growth furnace, polycrystalline casting furnace, polycrystalline reduction furnace, polycrystalline ingot furnace, high pressure gas quenching furnace, hot isostatic pressing furnace, thermal balance furnace, low pressure sinter Furnace, pressure vacuum sintering furnace, etc. It is also widely used in defense, metallurgy, chemical industry and other industries. Especially with the rapid development of polycrystalline silicon and monocrystalline silicon industries, as an ideal material for thermal insulation of high temperature furnaces, the demand for high-quality hard carbon fiber felt has reached an unprecedented height.

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 furnace with 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 non-oxidizing atmosphere, the temperature of graphite felt can reach 2850℃.

Physical and chemical indicators:

Temperature resistance: 1800 ℃ in vacuum, 2850 ℃ in inert gas

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

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.