graphite felt

7/28/2019 Graphite Felt

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Industrial Application:

Felt


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Carbon felt as wellas graphite felt are produced

and have unique textile,chemical and

thermal properties.

Felt


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Carbon felt

Carbon feltThis type of felt is manufactured by

carbonisation of natural and synthetic fibres.

Thermal properties

Chemical properties

Applications


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Carbon felt thermal propertiesThermal properties:

Low thermal conductivity Low specific heat

Permits rapid heating and cooling of furnace.

High thermal stability

In oxidizing atmosphere up to 350C, in protective atmosphere or vacuum up to about

3000C.

Favourable resistivity

Coupling in an inductive field occurs only above 12kHz.

Easy of handling

Felt can be cut with scissors or knife and adapts to small bending radii. Favourable surface properties


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Carbon felt Chemical properties

Chemical properties of carbon felt:

For hot and/or corrosive gases and liquids

For molten metals (no wetting)

Catalyst support: simplified recovery of the catalyst by heat treatment

Porous electrodes: for accumulators and fuel cells


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Carbon felt ApplicationsApplications of carbon felt:

For resistance- or induction heated vacuum furnaces and inert gas furnaces, such asdegassing furnaces, brazing furnaces, soft and bright annealing furnaces, sinteringfurnaces for hard metals, carburising furnaces, laboratory graphitising furnaces.

For inductively heated melting and heat treatment furnaces, in which a proportion of theceramic insulating material is replaced by felt in order to increase the electrical efficiencyand prevent the liquid metal from coming into contact with the induction coil in the eventof crucible fracture (no wetting).

For nuclear reactor technology (small cross-sectional area for neutron absorption).

Felt is applied as thermal insulation, as filters, and as catalyst support.

It can also be applied for porous electrodes.


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Customized Products:

Customized self supporting insulation cylinderconsisting of solf felt, cfc and graphite foil

Insulationcylinder from felt with CFC

support

Graphite foil can be applied in order to

avoid diffusion

Flexible quantities according to application


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Graphite felt:Graphite felt

Graphite felt is manufactured by graphitisation of carbon felt.

Graphite felt is applied as insulating material, for filters, heat shields or insulating

claddings as well.

Properties Customized products


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Graphite felt: properties

The characteristic properties of graphite felt are:

Low thermal conductivity: Graphite foil-faced felts ensure heat reflection (to the furnaceinterior) and the foil acts as a diffusion barrier

Low specific heat: Graphite felt permits rapid heating and cooling of the furnace.

High thermal stability: The felt is stable in oxidizing atmospheres up to 400C, in vacuumup to about 2500C and under inert atmospheres up to 3000C.

Shape retentivity: The felt does not undergo compression under normal operatingconditions. The bulk density thus remains unchanged throughout the entire insulatinglayer. The properties are constant and no voids, channels or hot sports occur.

Low absorption of gases or vapours: Graphite felts hardly absorb any moisture in

difference to carbon felt. Brief pumping times in vacuum furnaces are possible.

Erosion resistance Due to the carbon binder, the rigid felt fibres are securely anchored andnot even torn off at high gas velocities.

Low ash content Due to the temperature treatment during graphitisation ash content ismuch lower than for carbon felt

graphite felt

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