Turbine ring sector having an environmental barrier doped with an electrically-conductive element

Patent metadata

Field	Value
Publication number	US-10724399-B2
Application number	US-201716076928-A
Country	US
Kind code	B2
Filing date	Feb 16, 2017
Priority date	Feb 18, 2016
Publication date	Jul 28, 2020
Grant date	Jul 28, 2020

Abstract

A turbine ring sector made of ceramic matrix composite material has a portion forming an annular base with an inner face for defining the inner face of a turbine ring when the ring sector is mounted on a ring support structure and an outer face from which there extends an attachment portion for attaching the ring sector to the ring support structure, the ring sector further including inter-sector faces, each for facing a neighboring ring sector when the ring sector is mounted on the ring support structure; wherein the inter-sector faces are coated in an environmental barrier that is doped with an electrically-conductive compound and that presents at least one slot.

First claim

The invention claimed is:

1. A turbine ring sector made of ceramic matrix composite material having a portion forming an annular base with an inner face for defining the inner face of a turbine ring when the ring sector is mounted on a ring support structure and an outer face from which there extends an attachment portion for attaching the ring sector to the ring support structure, the ring sector further comprising inter-sector faces, each for facing a neighboring ring sector when the ring sector is mounted on the ring support structure; wherein the inter-sector faces are coated in an environmental barrier that is doped with an electrically-conductive compound and that presents at least one slot slot, and wherein the slot extends through only a fraction of the thickness of the environmental layer.

2. A ring sector according to claim 1 , wherein the slot has a blind shape.

3. A ring sector according to claim 1 , wherein the electrically-conductive compound is silicon.

4. A ring sector according to claim 1 , wherein the electrically-conductive compound is an electrically-conductive carbon compound.

5. A ring sector according to claim 1 , wherein the electrically-conductive compound is a metal compound.

6. A ring sector according to claim 1 , wherein the electrically-conductive compound is silicon carbide.

7. A ring sector according to claim 1 , wherein the environmental barrier further comprises at least one rare earth silicate.

8. A ring sector according to claim 7 , wherein the environmental barrier comprises a first layer comprising the rare earth silicate doped with the electrically-conductive compound, and a bonding second layer situated between the first layer and the ceramic matrix composite material of the ring sector.

9. A ring sector according to claim 1 , wherein the content by weight of electrically-conductive compound in the layer of the environmental barrier in which that compound is present lies in the range 5% to 35%.

10. A turbine ring assembly comprising a ring support structure and a plurality of ring sectors forming a turbine ring, each ring sector being mounted on the ring support structure and being as defined according to claim 1 , at least one sealing tongue being present in the slot in the environmental barrier of each ring sector.

11. A turbine engine including a turbine ring assembly according to claim 10 .

12. A method of fabricating a ring sector according to claim 1 , the method comprising:
forming on the inter-sector faces of a ring sector an environmental barrier doped with an electrically-conductive compound; and
using electrical discharge machining to form at least one slot in the environmental barrier as formed in this way.

13. A turbine ring sector made of ceramic matrix composite material having a portion forming an annular base with an inner face for defining the inner face of a turbine ring when the ring sector is mounted on a ring support structure and an outer face from which there extends an attachment portion for attaching the ring sector to the ring support structure, the ring sector further comprising inter-sector faces, each for facing a neighboring ring sector when the ring sector is mounted on the ring support structure; wherein the inter-sector faces are coated in an environmental barrier that comprises a first layer doped with an electrically-conductive compound and a bonding layer arranged between the first layer and the ceramic matrix composite material of the ring sector, the environmental barrier presenting at least one slot, and wherein the slot extends through the first layer, the bonding layer and terminates in the ceramic matrix composite material of the ring sector.

Assignees

• Safran Ceram

Inventors

• Carlin Maxime
• Pin Lisa

Classifications

• F01D11/122

  with erodable or abradable material (blades having cutting or grinding tips F01D5/20) · CPC title

• F05D2220/323

  for aircraft propulsion, e.g. jet engines · CPC title

• C04B41/5024

  Silicates (C04B41/5022 takes precedence; silico-fluorides C04B41/5018) · CPC title

• F05D2240/11

  Shroud seal segments · CPC title

• F01D25/007 Primary

  Preventing corrosion · CPC title