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Oxide-dispersion strengthening of porous powder metalurgy parts

United States Patent

April 23, 2002
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
Oxide dispersion strengthening of porous metal articles includes the incorporation of dispersoids of metallic oxides in elemental metal powder particles. Porous metal articles, such as filters, are fabricated using conventional techniques (extrusion, casting, isostatic pressing, etc.) of forming followed by sintering and heat treatments that induce recrystallization and grain growth within powder grains and across the sintered grain contact points. The result is so-called "oxide dispersion strengthening" which imparts, especially, large increases in creep (deformation under constant load) strength to the metal articles.
Judkins; Roddie R. (Knoxville, TN)
U. T. Battelle, LLC (Oak Ridge, TN)
09/ 277,851
March 26, 1999
The U.S. Government has rights in this invention pursuant to contract No. DE-AC05-96OR22464 between the Department of Energy and Lockheed Martin Energy Research Corporation.