Two-phase (TiAl+TiCrAl) coating alloys for titanium alumnides

Details Two-phase (TiAl+TiCrAl) coating alloys for titanium alumnides Two-phase (TiAl+TiCrAl) coating alloys for titanium alumnides

1996-07-03

1998-11-17

Zimmerman, John J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428651, 428654, 420552, 420580, 420418, B32B 1504, C22C 2100, C22C 3000, C22C 1400

Patent

active

058373870

ABSTRACT:
A coating for protecting titanium aluminide alloys, including the TiAl .gamma.+Ti.sub.3 Al (.alpha..sub.2) class, from oxidative attack and interstitial embrittlement at temperatures up to at least 1000.degree. C. is disclosed. This protective coating consists essentially of titanium, aluminum, and chromium in the following approximate atomic ratio:

REFERENCES:
Brady et al. "Oxidation-Resistant TiAlCr Alloys Developed", Jul. 10, 1996, NASA Lewis Research and Technology, 1994, published Jul. 10, 1995.
Klansky et al. "Structure/property observaions for Al-Ti-Cr intermetallic alloys", J. Mater, Res., vol. 9, No. 2, Feb. 1994 pp. 255-257.
McCarron et al. "Protective Coatings for Titanium Aluminide Intermetallics", Titanium '92, Science and Technology, (no month) 1993, pp. 1971-1978.
McKee et al. "The Oxidation Behavior of Gamma-Titanium Aluminide Alloys Under Thermal Cycling Conditions", Corrosion Science, vol. 33, No. 12, pp. 1899-1914, 1992 (June).
Brady et al. "Microstructure/Oxidation/Microhardness Correlations in gamma-based and tau-based Al-Ti-Cr Alloys", Mat. Res. Soc. Symp. Proc., vol. 364, (no month) 1995, pp. 1309-1314.
Brady et al. "Microstructure of Alumina-Forming Oxidation Resistant Al-Ti-Cr Alloys", Scripta Metallurgica et Materialia, vol. 32, No. 10, pp. 1659-1664, (no month) 1995.
Brady et al., "Oxidation Mechanism of gamma+Laves Ti-Al-Cr Coating Alloys", 1995 NASA HITEMP Proceedings, Oct. 23, 1995, pp. 1-3.
Brady et al., "Microstructure/Property Correlations in Alumina Forming Al-Ti-Cr Alloys", 1994 NASA HITEMP Proceedings, Oct. 24, 1994, pp. 1-3.

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