Air seal system with backside abradable layer

Patent metadata

Field	Value
Publication number	US-12123307-B2
Application number	US-202418418726-A
Country	US
Kind code	B2
Filing date	Jan 22, 2024
Priority date	Jun 17, 2022
Publication date	Oct 22, 2024
Grant date	Oct 22, 2024

Abstract

A method includes providing a ceramic matrix composite (CMC) seal arc segment that has radially inner and outer sides, attaching an abradable layer on the radially outer side of the CMC seal arc segment, providing a carrier to support the CMC seal arc segment, the carrier including a ridge, and sliding the CMC seal arc segment relative to the carrier such that during the sliding the ridge cuts a groove into the abradable layer, the ridge remaining disposed in the groove to thereby provide a labyrinth seal that partitions the cooling cavity between the carrier and the CMC seal arc segment into sub-cavities.

First claim

What is claimed is:

1. A method comprising:
providing a ceramic matrix composite (CMC) seal arc segment that has radially inner and outer sides;
attaching an abradable layer on the radially outer side of the CMC seal arc segment;
providing a carrier to support the CMC seal arc segment, the carrier including a ridge; and
sliding the CMC seal arc segment relative to the carrier such that during the sliding the ridge cuts a groove into the abradable layer, the ridge remaining disposed in the groove to thereby provide a labyrinth seal that partitions a cooling cavity between the carrier and the CMC seal arc segment into sub-cavities.

2. The method as recited in claim 1 , wherein the outer side of the CMC arc segment has a pair of hooks that define a dovetail slot there between, the carrier has a dovetail, and the sliding includes sliding the dovetail into the dovetail slot.

3. The method as recited in claim 2 , wherein the ridge has a knife edge.

4. The method as recited in claim 1 , wherein the abradable layer is selected from the group consisting of pure silicon, yttria stabilized zirconia, gadolinia stabilized zirconia, and combinations thereof, and the carrier, including the ridge, is selected from the group consisting of a Ni-based alloy and a cobalt-based alloy.

Assignees

• Rtx Corp

Inventors

• Johnson Dean
• Clark Thomas E

Classifications

• Y10T29/49936

  Surface interlocking · CPC title

• B23P15/008

  Rocket engine parts, e.g. nozzles, combustion chambers · CPC title

• F05D2230/60

  Assembly methods · CPC title

• Y10T29/49297

  Seal or packing making · CPC title

• F05D2230/10

  by removing material · CPC title