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Pt-Modified (Gamma)-Ni+(Gamma Prime)-Ni3Al-Based Compositions for High-Temperature, Degradation-Resistant Structural Alloys
Category(s):
For Information, Contact:
Craig Forney
Commercialization Manager, Chemistry and Materials Sciences
515-294-4740
licensing@iastate.edu
Web Published:
4/7/2016
ISURF #
3201
Summary:
ISU researchers have developed novel compositions that are specifically intended for high-strength, high-temperature resistant structural metallic alloys in novel architectures including honeycomb, truss-core or barrier foils. The compositions are particularly relevant to high-temperature coatings for aerospace applications such as space reentry vehicles and hypersonic missiles.

Development Stage:
Description:
High value-added aerospace systems such as space re-entry and hypersonic missiles routinely require localized heat protection during service.  Materials that provide refractory protection must be oxidation resistant themselves. Degradation by oxidation is the key limitation of advanced materials such as carbon-carbon composites or refractory metal silicides. Most commercial alloys do not exhibit adequate oxidation resistance, largely due to the structure and kinetics of the oxides they form.

To further enhance properties of certain γ′-Ni3Al+γ-Ni alloys such as strength and ductility, this technology is based on the finding that addition of up to 20% strengthening elements can be added without substantially altering the γ′-Ni3Al+γ-Ni phase stability. Suitable strengthening elements include, Cr, Si, Co, Mo, Re, Ta, W. The resulting strengthened alloy compositions form highly adherent, slow-growing TGO scales during both isothermal and cyclic oxidation at high temperatures (1150-1200° C). The technology is also based on the finding that controlling the Al content of certain γ′-Ni3Al+γ-Ni alloy compositions to below about 16% renders them heat treatable.

Advantage:
• Enhanced strength and ductility
• Oxidation resistant
Application:
Aerospace Coatings
Patent Information:
*To see the full version of the patent(s), follow the link below, then click on "Images" button.
Country Serial No. Patent No. Issued Date
United States 12/173,683 8,821,654* 9/2/2014


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