Oxyfluoride-type mold for casting molten reactive and refractory metals
AssigneeRem Metals Corporation
InventorRobert A. Brown
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Abstract
A mold for casting molten reactive and refractory metals has a facing portion comprising finely divided particles of the oxyfluorides of the metals of Group IIIa, including the lanthanide and actinide series, of the Periodic Chart (after Mendeleeff) and a back-up portion comprising finely divided particles of shell mold back-up material. The oxyfluroide content of the facing portion is essentially inert to titanium and other reactive and refractory molten metals and hence minimizes contamination by mold degradation products of metal objects cast in the mold.
Claims10
A mold for casting molten reactive and refractory metals comprising:
- a. a facing portion comprising finely divided particles of at least one member of the group consisting of the oxyfluorides of the metals of Group IIIa, and the lanthanide and actinide series of Group IIIa, of the Mendeleevian periodic chart of the atoms, and a binder therefor,
- b. said oxyfluorides having free energies of formation at 1000.degree. K. of at least 69 kilocalories per gram atom of contained oxygen and fluorine, and
- c. a backup portion comprising finely divided particles of shell mold back up material and a binder therefor.
Dependencies are inferred from the claim text.