Graphite felt

Graphite felt is divided into pitch-based graphite felt, polyacrylonitrile-based (PAN-based) graphite felt and viscose-based graphite felt according to the choice of raw felt. It is mainly used as thermal insulation and heat insulation materials for single crystal silicon smelting furnaces. In the chemical industry, it can be used as a filter material for high-purity corrosive chemical reagents.

Definition of graphite felt
Carbon felt is graphite felt after being treated at a high temperatur

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Graphite felt is divided into pitch-based graphite felt, polyacrylonitrile-based (PAN-based) graphite felt and viscose-based graphite felt according to the choice of raw felt. It is mainly used as thermal insulation and heat insulation materials for single crystal silicon smelting furnaces. In the chemical industry, it can be used as a filter material for high-purity corrosive chemical reagents.

Definition of graphite felt
Carbon felt is graphite felt after being treated at a high temperature above 2000°C in vacuum or inert atmosphere, and the carbon content is higher than that of carbon felt, reaching more than 99%. At the end of the 1960s, graphite felt was available in the world. Graphite felt is divided into three types: pitch-based, polyacrylonitrile-based graphite felt and viscose-based graphite felt, depending on the choice of raw felt.

Properties and application of graphite felt
Compared with viscose-based graphite felt, polyacrylonitrile-based graphite felt has stronger strength and stronger oxidation resistance, but has poor flexibility, high bulk density, and good thermal insulation performance. In addition to the high purity, high temperature resistance, corrosion resistance, and non-melting properties of bulk graphite, they also have the advantages of being elastic, foldable, tailorable, and sewn with graphite yarn. Graphite felt is mainly used as heat preservation and heat insulation materials for monocrystalline silicon smelting furnaces. In the chemical industry, it can be used as a filter material for high-purity corrosive chemical reagents. Graphite felt can be used at a temperature of about 3000°C under a non-oxidizing atmosphere.

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