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Castings of metallic alloys with improved surface quality, structural integrity and mechanical properties fabricated in finegrained isotropic graphite molds under vacuum

  • US 6,799,626 B2
  • Filed: 05/14/2002
  • Issued: 10/05/2004
  • Est. Priority Date: 05/15/2001
  • Status: Expired due to Term
First Claim
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1. A method of making cast shapes of a metallic alloy, comprising the steps of:

  • melting the alloy under vacuum or partial pressure of inert gas;

    pouring the alloy into a mold with a cavity, wherein the mold is made of machined graphite, wherein the graphite has been isostatically or vibrationally molded and has ultra fine isotropic grains having a particle size in the range of 3 to 40 microns, a density between 1.65 and 1.9 grams/cc, flexural strength between 5,500 and 20,000 psi, compressive strength between 9,000 and 35,000 psi, and porosity below 15%;

    solidifying the melted alloy into a solid body taking the shape of the mold cavity.

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