Due to the different raw blanket felt, the graphite felt is divided into 3 kinds: Petro coke-based, Pan-based graphite felt and Rayon-based graphite felt. The main application is used as insulation, insulating materials for monocrystalline silicon smelting furnace. In the chemical industry, it can be used as high-purity corrosive chemical reagents filter material.
Definition of graphite felt
After high temperature above 2000 ℃ in the vacuum or inert atmosphere, the carbon felt turned into graphite felt. The carbon content is much higher than carbon felt, its 99% min. There is production and supply at end of the 1960s in the world. Due to the different raw blanket felt, the graphite felt is divided into 3 kinds: Petro coke-based, Pan-based graphite felt and Rayon-based graphite felt.
Japanese produces mainly Petro coke-based graphite felt, Europe and the United States are basically Rayon graphite felt, while in China, we usually use Pan-based material to produce graphite felt. The process is this: We cut Pan-based carbon felt or Rayon-based carbon felt into the required size, rolled into a cylindrical container made of graphite material, the graphite container placed in high-temperature furnace (high-temperature furnace for graphite tube furnace, High-frequency induction furnace or other heating form of high-temperature furnace), vacuum or high pure inert gas protection to 100 ~ 300 ℃ / h heating rate to 2200 ~ 2500 ℃, then naturally cooled to 100 ℃ , then we got graphite felt.
Specification for Graphite Felt
Specifications Pan Graphite Felt Rayon Graphite Felt
Length (mm) ≥1500 ≥2000
Width (mm) 1000 ±200 1000 ±200
Thickness (mm) 3~ 15 3-15
Properties
| Item | specification | ||
| Bulk density g/cm3 | 0.12～0.18 | ||
| Carbon content % | >99.9 | ||
| Thermal conductivity （1450℃）W/（mk) | 0.12～0.18 | ||
| Specific resistance Ωmm2/m | 0.16-0.21 | ||
| N/cm2 | portrait | ≥0.13 | |
| level | ≥0.06 | ||
| tensile strength Mpa | 0.14-0.30 | ||
| Ash content % | ≤0.02 | ||
| Processing temperature ℃ | 2200 | ||
|
Environment To use |
air ℃ | ≤400 | |
| vacuum ℃ | ≥2500 | ||
| Inertia air ℃ | ≥2800 | ||
Packing, storage and delivery:
Packed in plastic film, then packed in carton.
In the storage, don’t break the plastic film, At dry and ventilated places, preventing damps and rains
Shipper as non-dangerous goods.
Pan-based graphite felt stronger than the Rayon-based graphite felt, strong antioxidant capacity, but the flexibility is poor, and with higher bulk density. In addition to their high purity, high temperature, corrosion resistance, non-melting properties, there are flexible, can be folded, cut and can be used graphite yarn suture and other advantages. Graphite felt main application is used as a single crystal silicon smelting furnace insulation material. In the chemical industry can be used as high-purity corrosive chemical reagents filter material. The application temperature Graphite felt can up to 3000 ℃ or so in non-oxidizing atmosphere conditions.