The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 13, 1999
Filed:
Feb. 25, 1997
Jeffrey D Irvine, Chippewa Falls, WI (US);
Russell G Vogt, Yorktown, VA (US);
Donald L Bierstine, Newton, NJ (US);
Christine M Stabile, Rockaway, NJ (US);
John R Mihalisin, N. Caldwell, NJ (US);
Jeffery S Smith, Norton Shores, MI (US);
John P Kunkle, Flanders, NJ (US);
Gail R Cole, Muskegon, MI (US);
Thomas W Nielsen, Whitehall, MI (US);
Howmet Research Corporation, Whitehall, MI (US);
Abstract
Directionally solidified superalloy components having a bulk sulfur concentration of less than 1 part per million by weight are provided by vacuum melting a charge to form a superalloy melt, desulfurizing the melt by contact with a calcium-bearing desulfurizing agent for a time to reduce sulfur concentration of the melt to less than 1 ppm by weight, casting the melt directly or following solidification and remelting in a ceramic investment mold, and directionally solidifying the melt as cast components without adverse bulk sulfur pick-up subsequent to desulfurization to provide castings having a sulfur content below 1 ppm, such as in the range of hundreds of parts per billion to provide significantly improved oxidation resistance.