Article having a heat-insulating coating system
A system comprising a substrate and a ceramic thermal barrier layer formed of columns which is applied to the substrate, characterized in that the columns are spatially separated from each other at the substrate or at least hardly contact each other is disclosed. A method for producing the system by laser welding is also disclosed. The disclosed material makes it possible to produce durable, heat-resistant components that can be used, for example, in turbines or in metal-supported fuel cells.
1 . A system comprising a substrate and a ceramic thermal barrier layer formed of first columns applied directly to an upper surface of the substrate, wherein each first column comprises a ceramic material, wherein each first column comprises a first portion of the ceramic material adjacent to the substrate which does not contain any cavities produced in the ceramic material and a second portion of the ceramic material spaced apart from the substrate that includes at least one cavity produced in the ceramic material, wherein the first columns are spatially separated from each other at the upper surface of the substrate by a gap having a distance of at least 5 μm, wherein the ceramic material is non-porous.
2 . The system according to claim 1 , wherein a diameter of at least one of the first columns is larger than 0.1 mm.
3 . The system according to claim 1 , wherein the first columns have a widening.
4 . The system according to claim 3 , wherein the first columns are connected to each other in a layer-like manner by one of: widenings above the substrate or a layer that is applied to the first columns.
5 . The system according to claim 1 , wherein the ceramic thermal barrier layer comprises second columns spatially separated from each other and applied to the first columns, wherein the second columns are arranged offset with respect to the first columns, and wherein the second columns comprise the ceramic material.
6 . The system according to claim 1 , wherein the upper surface of the substrate is formed by an adhesion promoter layer or by a ceramic layer on an adhesion promoter layer.
7 . The system according to claim 6 , wherein the upper surface of the substrate is formed by the adhesion promoter layer applied to a component consisting of a metal.
8 . The system according to claim 1 , wherein the ceramic thermal barrier layer consists of yttrium-stabilized zirconium oxide.
9 . The system according to claim 1 , wherein the first columns are produced by laser welding.
10 . The system according to claim 1 , wherein the first columns are arranged according to a uniform pattern.
11 . The system according to claim 1 , wherein a diameter of at least one of the first columns is larger than 0.3 mm.
12 . The system according to claim 1 , wherein a diameter of at least one of the first columns is smaller than 0.9 mm.
13 . The system according to claim 1 , wherein a diameter of at least one of the first columns is larger than 0.1 mm and smaller than 0.9 mm.
14 . The system according to claim 1 , wherein a diameter of at least one of the first columns is smaller than 0.7 mm.
15 . The system according to claim 1 , wherein a diameter of at least one of the first columns is larger than 0.3 mm and is smaller than 0.7 mm.
16 . The system according to claim 1 , wherein the extension of the at least one cavity is at least 50 μm.
17 . The system according to claim 1 , wherein the ceramic material comprises one or more pores due to manufacturing defects, wherein the pores are smaller than the at least one cavity.