| 摘要 |
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.
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