CPC B22D 1/00 (2013.01) [B22D 1/007 (2013.01); B22D 18/06 (2013.01); B22D 21/025 (2013.01); B22D 23/00 (2013.01); C22B 9/02 (2013.01)] | 20 Claims |
1. A countergravity casting apparatus comprising:
a melting crucible;
a casting mold;
a flowpath from the melting crucible to the casting mold; and
CaO particles positioned to prevent extraneous sulfur from entering molten metal from a surrounding environment, the CaO particles exposed to a headspace of the melting crucible.
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10. An apparatus for countergravity casting a metallic material, the apparatus comprising:
a crucible for holding melted metallic material;
a casting chamber for containing a mold;
a fill tube capable of extending into the crucible to communicate melted metallic material to the casting chamber;
a gas source coupled to a headspace of the melting crucible to allow the gas source to pressurize said headspace to establish a pressure differential to force the melted metallic material upwardly through said fill tube into said mold; and
means for preventing extraneous sulfur from entering the melted metallic material from a surrounding environment.
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