Fused sand-resistant turbine part
AssigneeSafran
InventorsAurélien Joulia, Luc Patrice Bianchi, Benjamin Dominique Roger Joseph Bernard
Life of this patent
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Abstract
A turbine part includes a substrate, an environmental barrier and one or more reactive layers. The environmental barrier includes a thermal insulation layer, a sublayer suitable for promoting adhesion between the substrate and the thermal insulation layer, and a protective layer suitable for protecting the substrate from oxidation and/or corrosion and partially covers the substrate. The one or more reactive layers are suitable for reacting with at least one CMAS compound selected from a calcium oxide, a magnesium oxide, an aluminum oxide and a silicon oxide, and cover a portion of the environmental barrier.
Claims14
A turbine part, comprising a substrate, an environmental barrier and at least one reactive layer,
- the environmental barrier comprising a thermal insulation layer, a sublayer suitable for promoting adhesion between the substrate and the thermal insulation layer, and a protective layer suitable for protecting the substrate from oxidation and/or corrosion,
- the environmental barrier at least partially covering the substrate,
- the at least one reactive layer being suitable for reacting with at least one CMAS compound selected from a calcium oxide, a magnesium oxide, an aluminum oxide and a silicon oxide,
- the at least one reactive layer covering at least a portion of the environmental barrier,
- wherein a material of the at least one reactive layer comprises an oxide of formula A′A″BO5+δ, A′ being selected from a rare-earth element and yttrium, A″ being selected from a rare-earth element, yttrium and aluminum, B being selected from zirconium, hafnium, tantalum and niobium, δ being a real number comprised between 0 and 0.5,
- wherein the oxide of formula A′A″BO5+δ has a rare-earth element atomic fraction comprised between 18% and 25%.
A process for protecting a turbine part comprising a step of depositing on the turbine part, a reactive layer suitable for reacting with at least one CMAS compound selected from a calcium oxide, a magnesium oxide, an aluminum oxide and a silicon oxide,
- wherein a material of the reactive layer comprises an oxide of formula A′A″BO5+δ, A′ being selected from a rare-earth element and yttrium, A″ being selected from a rare-earth element, yttrium and aluminum, B being selected from zirconium, hafnium, tantalum and niobium, δ being a real number comprised between 0 and 0.5,
- wherein the oxide of formula A′A″BO5+8 has a rare-earth element atomic fraction comprised between 18% and 25%,
- wherein the turbine part comprises:
- a substrate, and
- an environmental barrier comprising a thermal insulation layer, a sublayer suitable for promoting adhesion between the substrate and a thermal insulation layer, and a protective layer suitable for protecting the substrate from oxidation and/or corrosion,
- wherein the environmental barrier at least partially covers the substrate, and
- wherein the reactive layer is deposited on the environmental barrier.
Dependencies are inferred from the claim text.