Product to be exposed to a hot gas and having a thermal barrier layer, and process for producing the same
AssigneeSiemens Aktiengesellschaft
InventorWolfram Beele
Life of this patent
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Abstract
A product which is to be exposed to a hot gas and has a thermal barrier layer, such as a component for hot gas ducts (turbine blades, heat shields, etc.), has a metallic base body made of a superalloy based on nickel, cobalt or iron. An adhesion promoter layer also serves to form aluminum oxide/chromium oxide. A thermal barrier layer is formed of a ternary or pseudoternary oxide having a pyrochlore or perovskite structure. The oxide is stable with respect to phase between room temperature and melting temperature even in the absence of a phase stabilizer. A process is provided for producing components of that type by atmospheric plasma spraying or electron beam PVD methods.
Claims23
A product to be exposed to a hot gas, comprising a metallic base body to which a ceramic thermal barrier layer formed with a ternary or pseudoternary oxide is bonded, in which said oxide has a pyrochlore crystal structure of the structural formula A2B2O7 and in which said thermal barrier layer has pores or other voluminous defects.
A product to be exposed to a hot gas, comprising a metallic base body to which a ceramic thermal barrier layer formed with a ternary or pseudoternary oxide is bonded, in which said oxide has a perovskite crystal structure of the structural formula ABO3, in which A is calcium or ytterbium, and when A is calcium, B is hafnium, and when A is ytterbium, B is hafnium or zirconium and in which said thermal barrier layer has pores or other voluminous defects.
The product according to claim 14, in which a bonding layer having a bonding oxide is formed between the base body and the thermal barrier layer.
In a process for producing a product to be exposed to hot gas and having a metallic base body, the improvement which comprises applying a ceramic thermal barrier layer formed with a ternary or pseudoternary oxide having a pyrochlore crystal structure of the structural formula A2B2O7 to the base body by plasma spraying or by a PVD method.
Dependencies are inferred from the claim text.