Turbine shroud with locating inserts

Patent metadata

Field	Value
Publication number	US-10190434-B2
Application number	US-201514869532-A
Country	US
Kind code	B2
Filing date	Sep 29, 2015
Priority date	Oct 29, 2014
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

A turbine shroud for a gas turbine engine includes an annular metallic carrier, a blade track, and a cross-key connection formed between the annular metallic carrier and the ceramic blade track. The cross-key connection is formed between the annular metallic carrier and inserts included in the blade track.

First claim

What is claimed is:

1. A turbine blade track comprising
an annular ceramic runner formed to include a plurality of cutouts extending inward in a radial direction from an outer radial surface of the annular ceramic runner toward an inner radial surface of the annular ceramic runner, and
a plurality of inserts coupled to the annular ceramic runner, each insert including a stem arranged in the cutout and a cap arranged outside the cutout that extends from the stem in a circumferential direction and in an axial direction along the outer radial surface of the annular ceramic runner.

2. The turbine blade track of claim 1 , further comprising a plurality of braze layers arranged between the annular ceramic runner and each of the plurality of inserts.

3. The turbine blade track of claim 2 , wherein the braze layers arranged in the cutout and the braze layers are arranged between the radially outer surface of the annular ceramic runner and the caps of the inserts.

4. The turbine blade track of claim 3 , wherein an aft side of each of the plurality of inserts is coplanar with an aft side of the annular ceramic runner.

5. The turbine blade track of claim 3 , wherein the cutout is spaced apart from a forward side of the annular ceramic runner and from an aft side of the annular ceramic runner.

6. The turbine blade track of claim 5 , wherein the cap extends along the outer radial surface of the annular ceramic runner in both axial directions.

7. The turbine blade track of claim 2 , wherein the braze layers comprise silicon and a transition metal.

8. The turbine blade track of claim 7 , wherein the braze layers include a fluxing agent including at least one of boron and carbon.

9. The turbine blade track of claim 8 , wherein the braze layers comprise a filler material including at least one of silicon carbide, polycarbosilanes, carbon, aluminum oxide, and MAX phase material.

10. The turbine blade track of claim 1 , wherein the annular ceramic runner and the inserts both consist essentially of ceramic matrix composite.

11. A turbine blade track comprising
an annular ceramic runner arranged around a central axis and formed to include a plurality of cutouts extending inward in a radial direction from an outer radial surface of the annular ceramic runner toward an inner radial surface of the annular ceramic runner,
a plurality of inserts coupled to the annular ceramic runner, each insert including a stem arranged in the cutout and a cap arranged outside the cutout,
and a plurality of braze layers arranged between the annular ceramic runner and each of the plurality of inserts,
wherein the cap of each insert includes a radially-inner portion that extends circumferentially along the outer radial surface of the annular ceramic runner in both circumferential directions and a radially-outer portion that extends radially outward from the stem without extending circumferentially along the outer radial surface of the annular ceramic runner.

12. The turbine blade track of claim 11 , wherein the cap includes fillets that form a radius between the radially outer portion of the cap and the radially inner portion of the cap on at least two sides of the radially outer portion of the cap.

13. The turbine blade track of claim 11 , wherein the stem and the cap cooperate to form a lower case t shape.

14. The turbine blade track of claim 11 , wherein the cutout extends all the way through the annular ceramic runner from the outer radial surface to inner radial surface.

15. The turbine blade track of claim 11 , wherein an inner radial surface of the stem is flush with the inner radial surface of the annular ceramic runner.

16. A turbine shroud comprising
a metallic carrier that extends around an engine axis and is formed to include a plurality of circumferentially spaced apart keyways that extend axially into the carrier,
a blade track including a ceramic annular runner formed to include a cutout, an insert arranged to extend into the cutout, and a braze layer bonded to the ceramic annular runner and the cutout,
wherein the insert includes a stem arranged in the cutout and a cap that extends outwardly in the radial direction from the stem to provide a key that extends into a corresponding keyway formed in the metallic carrier to establish a cross-key connection between the blade track and the metallic carrier and the cap extends along the outer radial surface of the annular ceramic runner in an axial direction.

17. The turbine blade track of claim 16 , wherein an aft side of the insert is coplanar with an aft side of the annular ceramic runner.

18. The turbine blade track of claim 16 , wherein the cap extends in both directions axially from the stem.

19. The turbine blade track of claim 18 , wherein the cutout is spaced apart from a forward side of the annular ceramic runner and from an aft side of the annular ceramic runner.

20. The turbine blade track of claim 19 , wherein an aft side of the cap is coplanar with an aft side of the annular ceramic runner.

Assignees

• Rolls Royce Corp
• Rolls Royce Nam Tech Inc
• Rolls Royce Nam Tech Inc

Inventors

• Westphal William
• Sippel Aaron D
• Freeman Ted J

Classifications

• F01D25/24

  Casings (modified for heating or cooling F01D25/14); Casing parts, e.g. diaphragms, casing fastenings (casings for rotary machines or engines in general F16M {; special arrangements in stators dealing with breaking-off of part of rotor F01D21/045}) · CPC title

• F05D2220/30

  in turbines · CPC title

• F05D2300/2261

  of silicon · CPC title

• F01D11/08 Primary

  for sealing space between rotor blade tips and stator (specially-shaped blade tips therefor F01D5/20) · CPC title

• F01D9/04

  forming ring or sector · CPC title