US 11,772,152 B2
Countergravity casting apparatus and desulfurization methods
John J. Marcin, Jr., Marlborough, CT (US); Alan D. Cetel, West Hartford, CT (US); Mario P. Bochiechio, Vernon, CT (US); and Reade R. Clemens, Plainville, CT (US)
Assigned to RTX Corporation, Farmington, CT (US)
Filed by Raytheon Technologies Corporation, Farmington, CT (US)
Filed on Jul. 15, 2022, as Appl. No. 17/866,387.
Application 17/866,387 is a division of application No. 16/599,646, filed on Oct. 11, 2019, granted, now 11,433,452.
Application 16/599,646 is a division of application No. PCT/US2018/057675, filed on Oct. 26, 2018.
Claims priority of provisional application 62/578,226, filed on Oct. 27, 2017.
Prior Publication US 2022/0347741 A1, Nov. 3, 2022
Int. Cl. B22D 1/00 (2006.01); B22D 18/04 (2006.01); B22D 18/06 (2006.01); B22D 21/02 (2006.01); B22D 23/00 (2006.01); C22B 9/02 (2006.01)
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
OG exemplary drawing
 
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.
 
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.