Patent ID: 7699905
Filing Date: 2010-04-20
Classification: B22F,C22C,Y10T

Abstract:
1. A method of making dispersion-strengthened alloy particles, comprising: providing an alloy melt comprising an environmental resistance-imparting alloying element, a dispersoid-forming element, and a matrix metal, wherein the dispersoid-forming element exhibits a greater tendency to react with a reactive species than does the alloying element, atomizing said alloy melt with an atomizing gas comprising the reactive species to form atomized particles so that the reactive species is (a) dissolved in solid solution to at least a depth below the surface of atomized particles for reaction with the dispersoid-forming element by subsequent particle heating and/or (b) reacted with the dispersoid-forming element in-situ during atomization to form dispersoids in the atomized particles to at least a depth below the surface of said atomized particles, and (c) also forms a surface compound by reaction with the alloying element, solidifying the atomized alloy particles as solidified alloy particles or as a solidified deposit of alloy particles, wherein the solidified particles have the compound on particle surfaces, and heating the solidified alloy particles or the solidified deposit at a temperature such that the compound functions as a source of reactive species to form more dispersoids.