Iowa State University Research Foundation, Inc.

Andrew J Heidloff

Joel R Rieken

Iver E Anderson

A method for gas atomization of a titanium alloy, nickel alloy, or other alumina (AlO)-forming alloy wherein the atomized particles are exposed as they solidify and cool in a very short time to multiple gaseous reactive agents for the in-situ formation of a passivation reaction film on the atomized particles wherein the reaction film retains a precursor halogen alloying element that is subsequently introduced into a microstructure formed by subsequent thermally processing of the atomized particles to improve oxidation resistance.

Passivation and alloying element retention in gas atomized powders

A concentric ring gas atomization nozzle with isolated gas supply manifolds is provided for manipulating the close-coupled atomization gas structure to improve the yield of atomized powders.

Atomizer for improved ultra-fine powder production

A tubular melt containment member for transient containment of molten metals and alloys, especially reactive metals and alloys, includes a melt-contacting layer or region that comprises an oxygen-deficient rare earth oxide material that is less reactive as compared to the counterpart stoichiometric rare earth oxide. The oxygen-deficient (sub-stoichiometric) rare earth oxide can comprise oxygen-deficient yttria represented by YOwherein x is from 0.01 to 0.1. Use of the oxygen-deficient rare earth oxide as the melt-contacting layer or region material reduces reaction with the melt for a given melt temperature and melt contact time.

Growing community of inventors

West Des Moines, IA, United States of America

Andrew J Heidloff