Spray powder for the manufacture of a thermally insulating layer which remains resistant at high temperatures
First Claim
1. A spray powder for the manufacture of a thermally insulating layer produced on a substrate by means of a thermal spraying process, wherein the substrate has already been coated with a single- or multi-layer part coating, and wherein at least one thermally insulating functional material is used, which on the one hand has a lower thermal conductivity than the substrate and on the other hand forms a chemically and thermally stable phase at elevated temperatures, characterized in that the spray powder comprises particles which have an agglomerated microstructure formed by a plurality of granules adhering to each other, the granules being made of the at least one functional material, and at least one further component made of an additive or a plurality of additives, the further component being distributed finely dispersed on surfaces of the functional material granules, the further component exerting a retarding or eliminating effect with regard to sintering compounds which form between the functional material granules, wherein surfaces of the granules comprise micro-pores that produce low mass boundary zones where the granules contact each other.
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Accused Products
Abstract
The spray powder can be used for the manufacture of a thermally insulating layer which is resistant to high temperatures. A coating of this kind, a so-called TBC, can be produced on a substrate by means of a thermal spraying process. The substrate can already be coated with a single- or multi-layered part coating, in particular a primer. At least one thermally insulating functional material is used, which on the one hand has a lower thermal conductivity than the substrate and on the other hand forms a chemically and thermally stable phase at high temperatures. The spray powder comprises particles (1) which respectively have an agglomerate-like micro-structure (2) which is formed by a plurality of granules (3) adhering to each other. These granules are made up of the functional material or the functional materials. At least one further component is present made of an additive (4) or a plurality of additives. This further component is distributed finely dispersed on the surfaces (30) of the functional material granules (3), i.e. primarily in the boundary zones. The further component in the given form or in a transformed form exerts a retarding or eliminating effect with regard to sintering compounds, which can form at high temperatures between the functional material granules.
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Citations
15 Claims
- 1. A spray powder for the manufacture of a thermally insulating layer produced on a substrate by means of a thermal spraying process, wherein the substrate has already been coated with a single- or multi-layer part coating, and wherein at least one thermally insulating functional material is used, which on the one hand has a lower thermal conductivity than the substrate and on the other hand forms a chemically and thermally stable phase at elevated temperatures, characterized in that the spray powder comprises particles which have an agglomerated microstructure formed by a plurality of granules adhering to each other, the granules being made of the at least one functional material, and at least one further component made of an additive or a plurality of additives, the further component being distributed finely dispersed on surfaces of the functional material granules, the further component exerting a retarding or eliminating effect with regard to sintering compounds which form between the functional material granules, wherein surfaces of the granules comprise micro-pores that produce low mass boundary zones where the granules contact each other.
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7. A method for the manufacture of a spray powder having particles which have an agglomerated microstructure formed by a plurality of granules adhering to each other, the granules being made of the at least one functional material, and at least one further component made of an additive or a plurality of additives, the further component being distributed finely dispersed on surfaces of the functional material granules, the further component exerting a retarding or eliminating effect with regard to sintering compounds which form between the functional material granules, the method comprising forming micro-pores on surfaces of the granules to produce low mass boundary zones where the granules contact each other, and wherein
A1) at least one of the additives is introduced into a porous agglomerate of the functional material granules by means of an impregnating process or A2) agglomerates are manufactured from a mixture of the functional material granules and the finely dispersed additive or a homogenous or colloidal solution of the additive.
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10. A coated substrate comprising a thermally insulating layer manufactured from a spray powder comprising particles which have an agglomerated microstructure formed by a plurality of granules adhering to each other, the granules being made of the at least one functional material, and at least one further component made of an additive or a plurality of additives, the further component being distributed finely dispersed on surfaces of the functional material granules, the further component exerting a retarding or eliminating effect with regard to sintering compounds which form between the functional material granules, wherein surfaces of the granules comprise micro-pores that produce low mass boundary zones where the granules contact each other.
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15. A spray powder for the manufacture of a thermally insulating layer on a substrate comprising a plurality of agglomerated granules which adhere to each other to form particles and which are made of at least one functional material and at least one component comprising at least one additive, the component being dispersed over surfaces of the granules and retarding the formation of sintering compounds between the granules, wherein surfaces of the granules comprise micro-pores that produce low mass boundary zones where the granules contact each other.
Specification