초록 ▼

A metallic layer is cooled below room temperature, leading to an embrittlement. Subsequently, the metallic layer is stripped by performing a blasting process having a high efficiency because of the brittleness. Additionally, the substrate is prevented from being damaged by using a comparatively low

A metallic layer is cooled below room temperature, leading to an embrittlement. Subsequently, the metallic layer is stripped by performing a blasting process having a high efficiency because of the brittleness. Additionally, the substrate is prevented from being damaged by using a comparatively low blasting energy.

대표청구항 ▼

1. A method for removing a metallic layer of a layer-system including a substrate coated with the metallic layer, the method which comprises:cooling at least portions of the layer-system; and stripping at least portions of the metallic layer using a blasting process. 2. The method according to claim

1. A method for removing a metallic layer of a layer-system including a substrate coated with the metallic layer, the method which comprises:cooling at least portions of the layer-system; and stripping at least portions of the metallic layer using a blasting process. 2. The method according to claim 1, wherein the blasting process is an abrasive process.3. The method according to claim 1, wherein the blasting process is a non abrasive process.4. The method according to claim 1, wherein the blasting process is an abrasive sand blasting process.5. The method according to claim 1, wherein the blasting process is a non abrasive blasting process projecting dry ice particles.6. The method according to claim 1, wherein the cooling step is performed by cooling the layer-system in liquid nitrogen.7. The method according to claim 1, wherein the cooling step is performed by cooling the metallic layer more than the substrate.8. The method according to claim 1, wherein at a temperature below room temperature, the metallic layer has a higher low-temperature embrittlement than the substrate or an additional layer located between the substrate and the metallic layer.9. The method according to claim 1, wherein at a temperature below room temperature, the metallic layer has a higher thermal expansion coefficient than the substrate, thereby leading to a mechanical tension between the metallic layer and the substrate when the cooling step is performed.10. The method according to claim 1, wherein the stripping step includes removing the metallic layer in a controlled manner.11. The method according to claim 1, which comprises after performing the stripping step, stripping residual parts of at least metallic layer by performing a mechanical process or a chemical process.12. The method according to claim 1, wherein the metallic layer includes a brittle material.13. The method according to claim 1, wherein the layer-system is at least a portion of a gas turbine blade or vane.14. The method according to claim 1, wherein the substrate is made from a superalloy.15. The method according to claim 1, wherein the metallic layer includes an alloy of MCrAlY, where M is Fe, Co, or Ni; Cr is chromium; Al is aluminum; and Y is yttrium, any rare-earth element, or a mixture of rare-earth elements.16. The method according to claim 1, which comprises reheating at least some of the portions of the layer-system that have been cooled.17. The method according to claim 1, wherein at a temperature below room temperature, the metallic layer has a higher thermal expansion coefficient than an additional layer located between the substrate and the metallic layer, thereby leading to a mechanical tension between the metallic layer and the additional layer when the cooling step is performed.