Method for producing a corrosion protection layer for thermal insulation layers made of hollow aluminum oxide balls and glass layer and component as well as material mixture
AssigneeSiemens Aktiengesellschaft
InventorsMATHIAS GALETZ, XABIER MONTERO, WERNER STAMM
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Abstract
Provided is a special type of corrosion protection for ceramic thermal insulation layers which is produced by joining hollow aluminum oxide particles and an outer glass layer, which is produced; in particular, by thermal treatment.
Claims20
A process for producing a ceramic layer system having an outer ceramic corrosion protection layer, wherein, at least on a substrate, a metallic bonding layer, at least one ceramic thermal barrier coating on the substrate or on the metallic bonding layer, and an at least aluminum-containing layer are applied to the ceramic thermal barrier coating, which as a result of a heat treatment form aluminum oxide, which forms the outer ceramic corrosion protection layer, where the outer ceramic corrosion protection layer is made at least 50% thinner, wherein, in addition to aluminum:
- at least one element from the group:
- boron, germanium, gallium and/or at least one element from the group:
- zirconium, titanium, tantalum, niobium and/or hafnium is applied and/or oxidized for the outer ceramic corrosion protection layer and a heat treatment is carried out.
A component comprising at least:
- a substrate composed of a nickel- or cobalt-based superalloy, a metallic bonding layer, based on NiCoCrAlY, a ceramic thermal barrier coating for thermal insulation on the substrate, an outer ceramic corrosion protection layer on top of the ceramic thermal barrier coating, which ceramic corrosion protection layer is at least 50% thinner than the ceramic thermal barrier coating and comprises at least aluminum oxide and at least one metal or oxide selected from the group consisting of zirconium, titanium, tantalum, niobium and/or hafnium, and/or at least one element or compound from the group:
- boron, germanium and/or gallium, for the outer ceramic corrosion layer.
Dependencies are inferred from the claim text.