US 7,500,511 B2
Molding composition and method of use
George Connors, Chicago, Ill. (US); and Shirish Shah, Carol Stream, Ill. (US)
Assigned to Magneco/Metrel, Inc., Addison, Ill. (US)
Filed on Sep. 24, 2003, as Appl. No. 10/671,423.
Prior Publication US 2005/0061471 A1, Mar. 24, 2005
Int. Cl. B22C 1/02 (2006.01); B22C 9/04 (2006.01); B28B 7/34 (2006.01)
U.S. Cl. 164—519  [164/361; 106/38.3; 106/38.35] 37 Claims
OG exemplary drawing
 
12. A casting method, the method comprising:
providing a meltable patterned substrate;
coating the substrate with a slurry composition;
allowing the slurry composition to set and form a mold; and
removing the substrate from the mold;
wherein the slurry composition comprises
about 45% to about 80% by weight alumina;
about 10% to about 30% by weight silicon carbide;
about 10% to about 50% by weight colloidal silica;
about 0.01% to about 1% by weight welan gum; and
a setting agent.