DONALD RAY MILLER
Pharmacy in Bethel Park, PA
License number
Pennsylvania RP030172L
Category
Pharmacy
Type
Pharmacist
Address
Address
Bethel Park, PA 15102
Professional information
Silicon Nitride (Si.sub.3 N.sub.4) Leachable Ceramic Cores
US Patent:
4130157, Dec 19, 1978
Filed:
Jul 19, 1976
Appl. No.:
5/706334
Inventors:
Donald G. Miller - Bethel Park PA
Frederick F. Lange - Murrysville PA
Frederick F. Lange - Murrysville PA
Assignee:
Westinghouse Electric Corp. - Pittsburgh PA
International Classification:
B22D 2900, B22C 100
US Classification:
164132
Abstract:
A method of producing cast articles having internal cavities is disclosed. The method is particularly suitable for casting gas turbine components from nickel base and cobalt base superalloys. The method comprises: forming a core to the desired cavity configuration, the core consisting essentially of densified silicon nitride; securing the core within a mold; casting the alloy within the mold and around the core; removing the solidified cast article from the mold; and leaching the silicon nitride core from the casting in molten sodium hydroxide.