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US 5,495,495 AGranted
Dense lining for coreless induction furnace
AssigneeSaint-Gobain/Norton Industrial Ceramics Corporation
InventorGerard M. Cullan
Life of this patent
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Abstract
This invention relates to a refractory lining for use in a coreless induction furnace having a refractory crucible, wherein the refractory lining lines the inner surface of the refractory crucible and has a porosity of between 0.2% and 1%.
Claims16
A coreless induction furnace for processing a metal charge 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%.
1 more element
The furnace of 2 wherein the coil carries a current having a frequency of between 240 Hz and 3000 Hz.
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.
2 more elements
A process for processing metal comprising:
- a) filling a coreless induction 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%, with a solid metal charge, and
- b) electrifying the helical coil with a current having a frequency of between 240 Hz and 3000 Hz.
3 more elements
Dependencies are inferred from the claim text.