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Heat Treatment

There are many sectors of industry that use thermal processing in their production cycle. Many of these rely on furnaces that are electrically heated and hence need materials that have high thermal stability and high electrical loading capability. They also need to be resistant to aggressive media, thermal shock and be chemically pure so as not to deposit any unwanted elements during thermal processing. The use of Graphite parts offer the user the possibility to work at temperatures that are beyond the capability of metal and ceramic elements. These are usually not used above 2000ºC whereas graphite is capable of withstanding temperatures up to 3000ºC.

The properties of graphite and c/c composite make them the ideal materials of choise for components used in furnace applications including vacuum and inert atmosphere. graphite is easily machined so complex shapes can be made to suit the requirements of the furnace. Schunk’s c/c composite has been developed as a high strength to weigth ratio material suitable for many applications including carrier trays, structural parts and heater elements. The material has excellent shock and chemical resistance whilst having a low CTE and high purity. Due to low thermal conductivity and high emissivity Schunk’s graphite felt is especially appropriate for the use as insulation material. It provised excellent resistance to chemical attack and prolonged lifespan due to its high purity. Graphite soft felt is characterized by high flexibility and ease of processing. Rigid felt is an insulation material with a high dimensional stability.

The materials and grades recommended for these applications are shown in the table below.
For a copy of our Heat Treatment brochure please click here

Application Extruded/Moulded Graphite Isotropic Graphite C/C Composite and special
Vacuum Furnaces
Heating Elements FE250 G330 CF222, CF226
Furnace Furniture FE250 G347 CF222, CF226, CF227
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Furnace Linings FE250 CF226/2, CF227/2
Fasteners FE250 CF222, CF260
Fixtures Systems FE250 CF222, CF226, CF227
Boats FE250 G330
Sinter Trays FE250 G347 CF226, CF227
Crucibles G140 G348
Large Crucibles G140 G530
Soft felt GF1, GF2
Rigid felt boards InsuTherm® (FU4561), MechTherm® (FU2914)
Sacrificial skin Graphite foil, C/C foil
Electrical Steel Production
Conveyor Rolls FE250, FE250T G330, G330T
Carbon Fibre Production
Furnace Structure CF226, CF227
Heating Elements FE250 CF222, CF226, CF227