Low yttrium, high temperature alloy

Details Low yttrium, high temperature alloy Low yttrium, high temperature alloy

1992-11-18

1995-08-22

Simmons, David A.

Alloys or metallic compositions

Nickel base

Chromium containing

416241R, 416223R, 148404, C22C 1905

Patent

active

054437890

ABSTRACT:
An improved nickel-based single crystal superalloy has both an extremely low sulphur content and a very low lanthanum, cerium, or lanthanum plus yttrium, or cerium plus yttrium, or content, whereby the amount while very low, is sufficient to react with the remaining available sulphur in the alloy and with sulphur from the fuel used in engine operation, such that the very thin, protective scale layer of aluminum oxide formed on the surfaces of the nickel-based alloy parts exposed to the very high temperatures incident in high efficiency turbine engines, will afford effective, long-life protection for the surfaces of these engine components, through the virtual elimination of spalling of the aluminum oxide scale during cyclic engine operations.

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Journal of Materials Engineering and Performance, vol. 2, No. 4, Aug. 1993, Materials Park, Ohio, pp. 481-487, Harris et al. `Development of Two Rhenium-Containing Superalloys for Single-Crystal Blade and Directionally Solidified Vane Applications in Advanced Turbine Engines`.

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