METHOD FOR FIRING A CERAMIC AND REFRACTORY METAL CASTING CORE

METHOD FOR FIRING A CERAMIC AND REFRACTORY METAL CASTING CORE

A method for plasticizing a ceramic and refractory metal casting core is provided to protect a non-ceramic casting core element from excessive oxidation generated in executing a similar heating operation in the oxidizing atmosphere, by using the non-oxidizing atmosphere. A method(20) for plasticizin...

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Bibliographische Detailangaben
Hauptverfasser: VERNER CARL R, BULLIED STEVEN J, BOCHIECHIO MARIO P, KENNARD LEA D, MARCIN JOHN J. JR
Format: Patent
Sprache:eng
Schlagworte:
CASTING
FOUNDRY MOULDING
PERFORMING OPERATIONS
POWDER METALLURGY
TRANSPORTING
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Beschreibung
Zusammenfassung:A method for plasticizing a ceramic and refractory metal casting core is provided to protect a non-ceramic casting core element from excessive oxidation generated in executing a similar heating operation in the oxidizing atmosphere, by using the non-oxidizing atmosphere. A method(20) for plasticizing a ceramic and refractory metal casting core comprises the steps of: making compounds of a ceramic casting core element and a non-ceramic casting core element; heating the compounds up to the first temperature of the atmosphere of at least 316°C(600°F) in the oxidizing atmosphere(28); and heating the compounds up to the second temperature of the atmosphere of at least 817°C(1600°F) in the non-oxidizing atmosphere(42). In the forming step, the ceramic casting core element is formed on the non-ceramic casting core element and the non-ceramic casting core element is shaped from a refractory metal sheet.