Dense lining for coreless induction furnace

F - Mech Eng,Light,Heat,Weapons – 27 – B

Patent

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F27B 14/10 (2006.01) F27B 14/06 (2006.01) F27D 1/10 (2006.01) F27D 1/16 (2006.01) H05B 6/24 (2006.01)

Patent

CA 2176537

This specification discloses a refractory lining for use in a coreless induction furnace having a refractory crucible. In the induction furnace, the refractory lining lines the inner surface of the refractory crucible and has a porosity of between 0.2% And 1%. Also in accordance with the present invention, there is provided a coreless induction furnace for processing a metal charge the furnace comprising: (a) an outer casing comprising a helical coil, and (b) an inner crucible comprising (i) an outer refractory layer having a porosity of at least about 10%, and (ii) an inner refractory lining having a porosity of between 0.2% and 1%. In another aspect, the specification discloses a process for producing a coreless induction furnace comprising the steps of (a) flame spraying a molten ceramic material onto a former to provide a dense refractory lining having a porosity of between 0.2% and 1.0%, (b) positioning the former within an outer casing to define a space therebetween, (c) filling the space with refectory grain, (d) ramming the refractory grain to provide an outer rammed refractory layer having a porosity of at least about 10%, and (e) removing the former.

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