Ceramic matrix composite blade outer air seal

Abstract

A blade outer air seal (BOAS) includes a tube of a ceramic matrix composite (CMC) material. A preform within the shell defines a mount for the BOAS. The preform is of a CMC material. A gas turbine engine and a method of forming a blade outer air seal (BOAS) are also disclosed.

What is claimed is: 
     
         1 . A blade outer air seal (BOAS) comprising:
 a tube of a ceramic matrix composite (CMC) material;   a preform within the shell defining a mount for the BOAS, wherein the preform is of a CMC material.   
     
     
         2 . The BOAS as recited in  claim 1 , wherein the tube has a first open end and a second open end at opposite sides of the BOAS, and the preform comprises a first preform in the first open end facing circumferentially outward and a second preform in the second open end facing circumferentially outward opposite the first preform. 
     
     
         3 . The BOAS as recited in  claim 2 , wherein the first preform and the second preform define a curved surface defining a first slot on the first end and a second slot on the second end. 
     
     
         4 . The BOAS as recited in  claim 3 , wherein the first preform and the second preform have primary fibers substantially following a contour of a corresponding one of the first slot and the second slot. 
     
     
         5 . The BOAS as recited in  claim 4 , including at least one insert for each of the first preform and the second preform supporting a portion of the corresponding one of the first preform and the second preform. 
     
     
         6 . The BOAS as recited in  claim 2 , wherein the tube comprises a substantially rectangular shape with a radially inner surface and a radially outer surface, the radially outer surface including a first cutout and a second cutout at respective first and second ends. 
     
     
         7 . The BOAS as recited in  claim 6 , wherein each of the first end and the second end includes an end groove for a seal. 
     
     
         8 . The BOAS as recited in  claim 1 , wherein the tube has primary CMC fibers form one of a three-dimensional braid, a plurality of two-dimensional layers and a three-dimensional weave. 
     
     
         9 . The BOAS as recited in  claim 1 , wherein the tube has primary CMC fibers substantially following a longitudinal length of the BOAS. 
     
     
         10 . A gas turbine engine comprising:
 a case;   a mount attached to the case;   a blade outer air seal (BOAS) having a preform disposed within a tube, the preform defining a slot for receiving the mount, wherein the tube and the preform are provided by a ceramic matrix composite (CMC) material.   
     
     
         11 . The gas turbine engine as recited in  claim 10 , wherein the tube has a first open end and a second open end at opposite sides of the BOAS, and the preform comprises a first preform defining a first slot in the first open end facing circumferentially outward and a second preform defines a second slot in the second open end facing circumferentially outward opposite the first preform. 
     
     
         12 . The gas turbine engine as recited in  claim 11 , wherein the first preform and the second preform have primary fibers substantially following a contour of a corresponding one of the first slot and the second slot. 
     
     
         13 . The gas turbine engine as recited in  claim 12 , including at least one insert for each of the first preform and the second preform supporting a portion of the corresponding one of the first preform and the second preform. 
     
     
         14 . The gas turbine engine as recited in  claim 12 , wherein the tube comprises a substantially rectangular shape with a radially inner surface and a radially outer surface, the radially outer surface including a first cutout and a second cutout at respective first and second ends. 
     
     
         15 . The BOAS as recited in  claim 12 , wherein each of the first end and the second end includes an end groove for a seal. 
     
     
         16 . A method of forming a blade outer air seal (BOAS) comprising:
 forming a substantially rectangular tube of ceramic matrix composite (CMC) material;   forming a first preform and a second preform from a CMC material; and   assembling the first preform into a first end of the tube and the second preform into a second end of the tube.   
     
     
         17 . The method as recited in  claim 16 , wherein the first preform and the second preform are formed separate from the tube to define a respective first slot and second slot and forming of the first preform and the second preform includes orientating primary fibers to substantially follow a contour of the respective first slot and the second slot. 
     
     
         18 . The method as recited in  claim 16 , including forming the tube to include a radially outer surface and a radially inner surface and forming the radially outer surface to include a first cutout at the first end and a second cutout at the second end. 
     
     
         19 . The method as recited in  claim 16 , wherein assembling the first preform into the first end and the second preform into the second end includes installing at least one insert for supporting a portion of each of the first preform and the second preform.