Oxide strengthened molybdenum-rhenium alloy Page: 5 of 26
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OXIDE STRENGTHENED MOLYBDENUM-RHENIUM ALLOY
1. Field of the Invention. -
5
The present invention relates to a molybdenum-rhenium alloy having improved high
temperature resistance, ductility and strength. The present invention also relates to a
method of making the molybdenum-rhenium alloy.
10 2. Background of the Invention.
Molybdenum-base alloys have been used for high temperature applications, such
as furnace heating elements, radiant heat shields, susceptor rings for induction furnaces,
electrical posts for lamp filaments, high-temperature springs, high-strength fiber
15 reinforcements, high-strength dies, high-strength tubing for ballistic applications, and creep
resistant boats for sintering. Molybdenum-base alloys can be strengthened by solid-
solution strengthening, precipitation or dispersion strengthening, strain or work hardening
and grain size refining, and retaining a fine-grained worked microstructure to high
temperatures. For service at elevated temperatures, only the last three or a combination
20 on any of them have the potential for success.
Commercial molybdenum-base alloys generally do not possess sufficient creep and
tensile strength to survive operating temperatures above 13150C. Molybdenum TZM and
TZC alloys, strengthened by a combination of alloying, such as solid-solution
strengthening, and carbide particles, precipitation strengthening, plus thermomechanical
25 processing, experience substantial degradation of their mechanical properties above
13150C. This led to'the development of an oxide dispersion strengthened (hereinafter
"ODS") molybdenum alloy, which provides enhanced stability at temperatures above
13150C. ODS molybdenum alloy is formed by the following steps:
a slurry is first formed by dispersing molybdenum oxide and a metal salt in
30 an aqueous medium, the metal oxide being selected from nitrates and acetates of
lanthanum, cerium or thorium;
the slurry is then heated in the presence of hydrogen to form a molybdenum
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Bianco, Robert & Buckman, William R. Jr. Oxide strengthened molybdenum-rhenium alloy, patent, December 1, 1998; West Mifflin, Pennsylvania. (https://digital.library.unt.edu/ark:/67531/metadc703134/m1/5/: accessed May 4, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.