Turbine component and methods of assembling the same

1. A turbine component comprising:

an airfoil comprising a first surface and a second surface;

a thermal barrier coating coupled to said second surface and comprising a first portion, a second portion and a trench defined between said first and second portions;

a channel coupled in flow communication to said first surface and said trench, said channel comprising a first sidewall and a second sidewall opposite of said first sidewall, said first and second sidewalls extending from said first surface and toward said trench at an angle; and

a cover coupled to said second surface and comprising a first end coupled to said first portion and a second end extending into said trench and spaced from said second portion.

2. The turbine component of claim 1 , wherein said first portion comprises a straight end and said second portion comprises an angled end.

3. The turbine component of claim 1 , wherein said first portion comprises a straight end and said second portion comprises an angled end that is substantially aligned with said second sidewall.

4. The turbine component of claim 3 , wherein said angle of said angled end and second sidewall is less than about 90 degrees.

5. The turbine component of claim 1 , wherein said first end comprises a straight surface and said second end comprises an angled surface.

6. The turbine component of claim 1 , wherein said second end comprises an angled surface that is substantially aligned with said first sidewall.

7. The turbine component of claim 1 , wherein said cover comprises a substantially uniform thickness from said first end to said second end.

8. The turbine component of claim 1 , wherein said cover comprises a non-uniform thickness from said first end to said second end.

9. The turbine component of claim 1 , wherein said second end is substantially straight.

10. The turbine component of claim 1 , wherein said cover comprises a pre-sintered preform.

11. The turbine component of claim 1 , further comprising a brazed fastener coupled to said second surface and to said cover.

12. A cover coupled to an airfoil and positioned within a trench to direct medium flow from an angled channel and along the airfoil, said cover comprising:

a first end coupled to the airfoil;

a second end coupled to said first end and configured to extend into the trench, said second end comprising an angled surface that is aligned with the angled channel; and

a brazed fastener coupled to said first and second ends and to said airfoil, wherein said cover comprises a plurality of column members.

13. The cover of claim 12 , wherein said first and second ends comprise a pre-sintered pre-form.

14. A method of manufacturing a turbine component, said method comprising:

forming an angled channel through at least one of a first surface and a second surface of a substrate;

forming a cover comprising a first end and a second end;

coupling the cover to the first surface;

extending the cover beyond the angled channel and aligning the second end with the angled channel;

applying a mask to the first surface and the cover to cover the angled channel;

applying a thermal barrier coating to the first surface; and

forming a trench through the thermal barrier coating and in flow communication with the angled channel.

15. The method of claim 14 , wherein forming the trench comprises forming a first portion of the thermal barrier coating and a second portion of the thermal barrier coating and spaced from the first portion.

16. The method of claim 15 , further comprising forming an angled surface into the second portion.

17. The method of claim 14 , wherein forming the cover comprises forming a straight surface into the first end and an angled surface into the second end.

18. The method of claim 14 , wherein coupling the cover to the first surface comprises brazing the cover to the first surface.

19. The method of claim 14 , further comprising removing the mask to expose the angled channel.