# US 10,370,985 B2 · Full hoop blade track with axially keyed features > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,370,985 B2 - Document ID: US10370985B2 - Status: Granted - Kind: B2 - Application number: 14/972,568 - Filed: 2015-12-17 - Published: 2016-06-23 - Granted: 2019-08-06 - Earliest claimed: 2014-12-23 - Assignees: ROLLS-ROYCE plc - Applicants: Rolls-Royce Corporation - Inventors: Jeffrey A. Walston; Aaron D. Sippel; John A. Weaver; David J. Thomas - Web page: https://patentgrep.com/patent/US10370985B2 ## CPC - F01D 5/3023: {of radial insertion type, e.g. in individual recesses} - F01D 5/284: {Selection of ceramic materials} - F01D 9/04: forming ring or sector - F01D 11/08: for sealing space between rotor blade tips and stator (specially-shaped blade tips therefor F01D5/20) - F01D 11/122: {with erodable or abradable material (blades having cutting or grinding tips F01D5/20)} - F01D 25/246: {Fastening of diaphragms or stator-rings} - Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## 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 locates the ceramic blade track relative to the metallic carrier. ## Claims ### Claim 1 A turbine shroud for use in a gas turbine engine having a central axis, the turbine shroud comprising an annular metallic carrier, a one-piece annular ceramic runner concentric with the annular metallic carrier that extends around the central axis, the one-piece annular ceramic runner having a surface that faces radially outward away from the central axis, and a cross-key connection formed between the annular metallic carrier and the one-piece annular ceramic blade track to locate the one-piece annular ceramic runner relative to the annular metallic carrier, the cross-key connection including a plurality of keys and a plurality of corresponding keyways that receive the plurality of keys, wherein the plurality of keys extend in an axial direction from the one-piece annular ceramic runner parallel to the central axis without extending radially outward from the surface and the plurality of corresponding keyways that are formed in the annular metallic carrier. ### Claim 2 (depends on 1) The turbine shroud of claim 1, wherein the one-piece ceramic runner comprises ceramic matrix material and ceramic-containing reinforcements suspended in the ceramic matrix material. ### Claim 3 (depends on 2) The turbine shroud of claim 2, wherein the ceramic matrix material includes silicon-carbide and the ceramic-containing reinforcements include silicon-carbide. ### Claim 4 (depends on 2) The turbine shroud of claim 2, wherein the ceramic-containing reinforcements include plies of reinforcing fabric that extends around the central axis. ### Claim 5 (depends on 2) The turbine shroud of claim 2, wherein the plurality of keys are integral with the one-piece annular ceramic runner and each of the plurality of keys comprises ceramic matrix material and ceramic-containing reinforcements suspended in the ceramic matrix material. ### Claim 6 (depends on 1) The turbine shroud of claim 1, wherein the plurality of keys extend from an aft side of the one-piece annular ceramic runner into the plurality of corresponding keyways. ### Claim 7 (depends on 6) The turbine shroud of claim 6, wherein the plurality of keys and the one-piece annular ceramic runner have about the same thickness when viewed from a forward side of the runner. ### Claim 8 A turbine shroud for use in a gas turbine engine having a central axis, the turbine shroud comprising an annular metallic carrier, a one-piece annular ceramic runner concentric with the annular metallic carrier that extends around the central axis, a cross-key connection formed between the annular metallic carrier and the one-piece annular ceramic blade track to locate the one-piece annular ceramic runner relative to the annular metallic carrier, the cross-key connection including a plurality of keys and a plurality of corresponding keyways that receive the plurality of keys, and a plurality of insulator tabs that extend in an axial direction from the one-piece annular ceramic runner parallel to the central axis circumferentially between the plurality of keys and radially inward of a portion of the annular metallic carrier so that the plurality of insulator tabs insulate at least some of the annular metallic carrier from hot gasses during use of the turbine shroud within a gas turbine engine, wherein the plurality of keys extend in the axial direction from the one-piece annular ceramic runner parallel to the central axis and the plurality of corresponding keyways that are formed in the annular metallic carrier. ### Claim 9 (depends on 8) The turbine shroud of claim 8, wherein the plurality of insulator tabs are integral with the one-piece annular ceramic runner and each of the plurality of insulator tabs comprises ceramic matrix material and ceramic-containing reinforcements suspended in the ceramic matrix material. ### Claim 10 (depends on 8) The turbine shroud of claim 8, wherein the plurality of keys and the one-piece annular ceramic runner have about the same thickness when viewed from a forward side of the runner and the plurality of insulator tabs are thinner than the one-piece annular ceramic runner when viewed from a forward side of the runner. ### Claim 11 (depends on 8) The turbine shroud of claim 8, wherein the plurality of keys extend from an aft side of the one-piece annular ceramic runner into the plurality of corresponding keyways and the plurality of insulator tabs also extend from the aft side of the one-piece annular ceramic runner circumferentially between the plurality of keyways without being received in the plurality of keyways. ### Claim 12 A blade track for a gas turbine engine, the blade track comprising a one-piece annular ceramic runner that extends around a central axis and that comprises ceramic matrix material and ceramic-containing reinforcements suspended in the ceramic matrix material, the one-piece annular ceramic runner having a surface that faces radially outward away from the central axis, and a plurality of keys that extend in an axial direction from the one-piece annular ceramic runner parallel to the central axis without extending radially outward from the surface. ### Claim 13 (depends on 12) The blade track of claim 12, wherein the ceramic matrix material includes silicon-carbide and the ceramic-containing reinforcements include silicon-carbide. ### Claim 14 (depends on 12) The blade track of claim 12, wherein the ceramic-containing reinforcements include plies of reinforcing fabric that extends around the central axis. ### Claim 15 (depends on 14) The blade track of claim 14, wherein the plurality of keys are integral with the one-piece annular ceramic runner and each of the plurality of keys comprises ceramic matrix material and woven plies of ceramic-containing reinforcements suspended in the ceramic matrix material. ### Claim 16 (depends on 15) The blade track of claim 15, wherein the plurality of keys and the one-piece annular ceramic runner have about the same thickness when viewed from a forward side of the runner. ### Claim 17 A blade track for a gas turbine engine, the blade track comprising a one-piece annular ceramic runner that extends around a central axis and that comprises ceramic matrix material and ceramic-containing reinforcements suspended in the ceramic matrix material, a plurality of keys that extend in an axial direction from the one-piece annular ceramic runner parallel to the central axis, and a plurality of insulator tabs that extend in an axial direction from the one-piece annular ceramic runner parallel to the central axis circumferentially between the plurality of keys. ### Claim 18 (depends on 17) The blade track of claim 17, wherein the plurality of insulator tabs are integral with the one-piece annular ceramic runner and each of the plurality of insulator tabs comprises ceramic matrix material and ceramic-containing reinforcements suspended in the ceramic matrix material. ### Claim 19 (depends on 17) The blade track of claim 17, wherein the plurality of keys and the one-piece annular ceramic runner have about the same thickness when viewed from a forward side of the runner and the plurality of insulator tabs are thinner than the one-piece annular ceramic runner when viewed from a forward side of the one-piece annular runner. ### Claim 20 A method of locating a ceramic blade track having a surface that faces radially outward away from a central axis relative to a metallic carrier, the method comprising rotating the ceramic blade track to a predetermined orientation relative to the metallic carrier, nesting the ceramic blade track in a space formed by the metallic carrier so that the ceramic blade track is concentric with the metallic carrier, and inserting a plurality of keys extending in an axial direction from the ceramic blade track without extending radially outward from the surface into a corresponding plurality of keyways formed in the metallic carrier to thereby establish a cross-key connection between the ceramic blade track and the metallic carrier.