METHOD FOR PRODUCING A THERMAL BARRIER COATING ON A COMPONENT

Abstract

A method for producing a thermal barrier coating on a component, more particularly on a turbine component and preferably on a turbine blade, wherein the component is provided with the thermal barrier coating and structures are then created in the outer surface of the thermal barrier coating using a laser ablation process so as to segment the surface of the thermal barrier coating, the structures being created in the surface of the thermal barrier coating by an ultrashort pulse laser, more particularly a femtosecond laser is provided.

Claims

1-10. (canceled)

11. A method for producing a thermal barrier coating on a component, wherein the component is a turbine component and wherein the turbine component is a turbine blade, in which the component is provided with the thermal barrier coating and then structures are introduced into the outer surface of the thermal barrier coating by a laser ablation method, in order to segment the surface of the thermal barrier coating, wherein the structures are introduced into the surface of the thermal barrier coating by an ultra-short pulse laser, wherein the ultra-short pulse laser is a femtosecond laser, and in that the ultra-short pulse laser has an optics that comprises a galvoscanner or microscanner.

12. The method as claimed in claim 11, wherein the wobbling method, in which the advancing movement of the laser beam is overlaid with a movement transverse thereto, is used in order to produce the structures.

13. The method as claimed in claim 11, wherein in order to produce a structure having a given width, the laser beam generated by the ultra-short pulse laser is guided multiple times along a structure line to be created, wherein mutually offset tracks are created in the width direction of the structure.

14. The method as claimed in claim 11, wherein multiple continuous structures are introduced into the surface of the thermal barrier coating.

15. The method as claimed in claim 11, wherein discontinuous structures are introduced into the surface of the thermal barrier coating.

16. The method as claimed in claim 15, wherein the discontinuous structures comprise blind micro-bores which are introduced into the surface of the thermal barrier coating with a defined separation, diameter and depth.

17. The method as claimed in claim 15, wherein the discontinuous structures comprise V-shaped or U-shaped structures.

18. The method as claimed in claim 11, wherein intersecting structures are introduced into the surface of the thermal barrier coating.

19. The method as claimed in claim 11, wherein structures having at least in part a depth of at least 300 μm, are introduced into the surface of the thermal barrier coating.

20. The method as claimed in claim 11, wherein structures having at least in part a depth of at least 500 μm, are introduced into the surface of the thermal barrier coating.

21. The method as claimed in claim 11, wherein structures having at least in part a depth of at least 1000 μm, are introduced into the surface of the thermal barrier coating.

Description

BRIEF DESCRIPTION

[0026] Some of the embodiments will be described in detail, with refernce to the following figures, wherein like designations denote like members, wherein:

[0027] FIG. 1 shows a structure for segmenting the surface of a thermal barrier coating with continuous structure or engraving lines;

[0028] FIG. 2 shows an exemplary embodiment of a structure with continuous, intersecting engraving lines;

[0029] FIG. 3 shows an exemplary embodiment of a structure for segmenting the surface of a thermal barrier coating with multiple discontinuous engraving lines;

[0030] FIG. 4 shows an exemplary embodiment of a structure with blind bores for producing artificial porosity;

[0031] FIG. 5 shows an exemplary embodiment of a structure for segmenting the surface of a thermal barrier coating which is created by wobbling; and

[0032] FIG. 6 is a schematic diagram showing the scanning movement of a laser beam for creating a broad engraving line.

DETAILED DESCRIPTION

[0033] FIG. 1 shows an example for a structure for segmenting the surface of a thermal barrier coating. In this case, the structure consists of multiple straight, mutually parallel and continuous structure or engraving lines 1. However, the engraving lines 1 may also be sinuous, for example. It is essential that the engraving lines 1 do not intersect.

[0034] In the exemplary embodiment of FIG. 2, in addition to the mutually parallel engraving lines 1 of the exemplary embodiment shown in FIG. 1, there are provided engraving lines 2 which run parallel to one another and perpendicular to the lines 1, forming intersection points which create a grid-like engraving line structure.

[0035] In the exemplary embodiment of FIG. 3, there are provided multiple Z-like engraving lines 3 which are arranged distributed over the surface of a thermal barrier coating without intersecting. The Z-shaped engraving lines 3 are parallel to one another but positioned offset with respect to one another in the longitudinal and the transverse direction. The arrangement is such that the regions of extent of adjacent Z-shaped engraving lines 3 overlap.

[0036] In the exemplary embodiment shown in FIG. 4, structures in the shape of blind bores 5 are provided in the surface of a thermal barrier coating 4 for the purpose of producing artificial porosity, the blind bores having a defined depth T and a defined diameter D.

[0037] The exemplary embodiment shown in FIG. 5 demonstrates that engraving lines for producing a desired track width and track geometry can be created by wobbling. In this context, the advancing movement, which is indicated by an arrow f, is overlaid with a deflection movement transverse thereto, which is indicated by a double arrow A. The deflection movement A and possibly also the advancing movement f is/are produced by means of a galvoscanner or microscanner which appropriately deflects the laser beam generated by an ultra-short pulse laser.

[0038] Finally, FIG. 6 shows how, in an alternative to wobbling, it is possible to create a wide engraving line 7. Here, a laser beam L is guided multiple times along the engraving line to be created, mutually offset tracks being created in the width direction of the engraving line 7. To that end, the laser beam L is deflected by a suitable galvoscanner or microscanner, as indicated by an arrow S.

[0039] Although the invention has been described and illustrated in detail by way of the preferred exemplary embodiment, the invention is not restricted by the disclosed examples and other variations can be derived herefrom by a person skilled in the art without departing from the scope of protection of the invention.