High-temperature protection layer
AssigneeBBC Aktiengesellschaft Brown, Boveri & Cie
InventorsFranz Gross, Georg Wahl, Andrew R. Nicoll
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Abstract
High-temperature protection layer of an alloy with a base of aluminum, chromium and nickel, particularly for structural gas-turbine elements of an austenitic material. The base material of the alloy contains at least 8 to 12 atom % aluminum and 28 to 28 atom % chromium with the remainder nickel, and at least silicon and titanium are admixed to the base material as additives such that at a temperature below 900.degree. C., a passive cover layer of chromium oxide, and at a temperature above 900.degree. C., a passive cover layer of aluminum oxide is developed on the applied alloy.
Claims4
High-temperature protection layer for protecting structural elements of austenitic material subjected to temperatures below and above 900.degree. C., of an alloy applied to the austenitic structural material, said alloy having a base material containing at least 8 to 12 atom % aluminum, 18 to 28 atom % chromium, with the remainder nickel and 1 to 6 atom % silicon and 1 to 3 atom % titanium based on the base material of the alloy admixed to the base material as additives to induce a passive cover layer of chromium oxide to develop on the alloy at a temperature below 900.degree. C., and a passive cover layer of aluminum oxide to develop on the alloy at a temperature above 900.degree. C.
Dependencies are inferred from the claim text.