Accession Number : ADD004315

Title :   Self-Destructive Core Mold Materials for Metal Alloys.

Descriptive Note : Patent,


Personal Author(s) : Mazdiyasni,Khodabakhsh S ; Wills,Roger R

Report Date : 23 Aug 1977

Pagination or Media Count : 4

Abstract : In the casting of metal alloys to form hollow articles, a mold of a desired shape containing a core material fabricated to a desired configuration from a silicon yttrium or silicon lanthanide oxynitride is filled with a molten metal alloy while maintaining the mold under a vacuum or under a blanket of an inert gas after which the mold is allowed to cool slowly to room temperature. The casted metal alloy with the core material exposed at one end is removed from the mold and heated under ambient conditions, thereby causing the silicon yttrium or silicon lanthanide oxynitride to oxidize with a large volume expansion and a concomitant catastrophic failure of the core material. The broken pieces of core material are removed from the casting which has a smooth inner surface, an indication that no chemical reactions have occurred between the alloy and the core material. (Author)

Descriptors :   *Molds(Forms), *Cores, *Casting, *Patents, Silicon compounds, Yttrium compounds, Lanthanum compounds, Oxygen compounds, Nitrides

Subject Categories : Fabrication Metallurgy
      Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE