Induction crucible furnace and method for its preparation

US4351058A · kind A · utility

Inventors

• Rudolf Florian · Blomberg, DE
• Albert Thomas Herrmann · Brunsbüttel, DE

Key dates

• Filing date: Feb 19, 1980
• Grant date: Sep 21, 1982
• Expiry date: Feb 19, 2000

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F27B2014/0862
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

An induction crucible furnace includes a housing having a bottom wall and side walls which define a furnace cage. A prefabricated refractory crucible made of a mixture of a dry ramming material, a sintering agent and a cold-curing binder is disposed within the furnace cage with a clearance which is filled with a non-sintering granular material sealed within the furnace with a patching compound. A plurality of induction coils are disposed within the furnace cage and are separated from a layer of the non-sintering granular material by a heat-protective layer. In a method of manufacturing of the induction crucible furnace a refractory crucible is placed onto a bed of a non-sintering granular material disposed on the bottom wall of the furnace housing. A non-sintering granular material is filled into an annular space between the furnace cage and the crucible, then this material is compacted, closed and the furance is started up to reach the temperatures causing sintering of the mixture of the prefabricated refractory crucible.