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Induction is also used for high-temperature vacuum or under atmosphere operations for example for infiltration and treatment of composites. These parts must be subjected to long treatment (lasting several days) at high temperatures (up to 2,200°C) at various pressures (gas pressure and vacuum).
The method consists in heating a graphite susceptor via indirect induction which will heat the parts to be graphitized by radiant heat. The inductor and susceptor are placed in a chamber in which the required pressure cycle is provided. The MF power of certain modern installations exceeds
1,000 kW.
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Inductors are always large (3 meters in diameter and 4.5 meters high) and are often manufactured according to a (multi-zone( design. The furnace is then able, via a medium frequency inverter (CELES IS product range) , to vary the power supplied per zone and thus obtain the optimum homogeneous temperatures required for effective treatment.