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Title: Passivation and alloying element retention in gas atomized powders

A method for gas atomization of a titanium alloy, nickel alloy, or other alumina (Al.sub.2O.sub.3)-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.
Inventors:
; ;
Issue Date:
OSTI Identifier:
1411527
Assignee:
Iowa State University Research Foundation, Inc. (Ames, IA) AMES
Patent Number(s):
9,833,837
Application Number:
14/120,706
Contract Number:
AC02-07CH11358
Resource Relation:
Patent File Date: 2014 Jun 18
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE

Other works cited in this record:

Method for Inhibiting the Oxidation of Readily Oxidizable Metals
patent, September 1934

Atomizing nozzle and process
patent, June 1992

Gas atomization synthesis of refractory or intermetallic compounds and supersaturated solid solutions
patent, November 1994

Method of making environmentally stable reactive alloy powders
patent, December 1994

Product of a halogen containing Ti-Al system intermetallic compound having a superior oxidation and wear resistance
patent, September 1995

Apparatus for making environmentally stable reactive alloy powders
patent, December 1996

Environmentally stable reactive alloy powders and method of making same
patent, September 1998

Atomizing nozzle and method
patent, November 2000

Passivated titanium aluminide tooling
patent, September 2001

Thermal sprayed composite melt containment tubular component and method of making same
patent, March 2002

One-piece, composite crucible with integral withdrawal/discharge section
patent, July 2002

Atomizing apparatus for making polymer and metal powders and whiskers
patent, March 2003

Production Of Alloys Based On Titanium Aluminides
patent-application, May 2010

Stability of gas atomized reactive powders through multiple step in-situ passivation
patent-application, November 2013

Thermodynamic considerations of the beneficial effect of halogens on the oxidation resistance of TiAl-based alloys
journal, May 2003

Comparison of Different Fluorine Treatments for the Protection of TiAl-Alloys Against High Temperature Oxidation
journal, January 2010

Thermal Decomposition of NF3 by Ti, Si, and Sn Powders
journal, April 1995
  • Vileno, Elizabeth; LeClair, Michael K.; Suib, Steven L.
  • Chemistry of Materials, Vol. 7, Issue 4, p. 683-687
  • DOI: 10.1021/cm00052a012

Highly tuned gas atomization for controlled preparation of coarse powder. Hochleistungsgasverdüsung für die gezielte Präparation grober Pulver
journal, July 2010
  • Anderson, I. E.; Byrd, D.; Meyer, J.
  • Materialwissenschaft und Werkstofftechnik, Vol. 41, Issue 7, p. 504-512
  • DOI: 10.1002/mawe.201000636

Low temperature diffusion of oxygen in titanium and titanium oxide films
journal, October 1988

Improvement of the oxidation resistance of TiAl alloys by using the chlorine effect
journal, December 1997

Influence of chlorine on the oxidation behavior of TiAlMn intermetallic compound
journal, January 1996

Analysis of the spray deposition process
journal, February 1989

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