Turbine component

Abstract

A turbine component is disclosed. The turbine component includes an outer shroud and an inner shroud having a first hook region extending over a first portion of the outer shroud and a second hook region extending over a second portion of the outer shroud. A first hook gap, a second hook gap, a first radial gap, and a second radial gap are arranged and disposed to permit the inner shroud to deflect from the outer shroud under thermal loading. Additionally or alternatively, the inner shroud includes ceramic matrix composite fibers having a thermal conductivity of less than 200 W/m·k and greater than 10 W/m·k.

What is claimed is: 
     
         1 . A turbine component, comprising:
 an outer shroud; and   an inner shroud having a first hook region extending over a first portion of the outer shroud and a second hook region extending over a second portion of the outer shroud;   wherein the first hook region and the first portion define a first hook gap and the second hook region and the second portion define a second hook gap;   wherein a first radial gap extends between the first hook region opposite the first hook gap and the outer shroud and a second radial gap extends between the second hook region opposite the second hook gap and the outer shroud;   wherein the first hook gap, the second hook gap, the first radial gap, and the second radial gap are arranged and disposed to permit the inner shroud to deflect from the outer shroud under thermal loading.   
     
     
         2 . The turbine component of  claim 1 , wherein the inner shroud includes a ceramic matrix composite material. 
     
     
         3 . The turbine component of  claim 2 , wherein the ceramic matrix composite material includes a Si—C fiber and a SiC-matrix. 
     
     
         4 . The turbine component of  claim 3 , wherein the Si—C fiber is at a concentration, by volume, in the ceramic matrix composite of at least 20%. 
     
     
         5 . The turbine component of  claim 1 , wherein the outer shroud includes a metal or metallic material. 
     
     
         6 . The turbine component of  claim 1 , wherein the inner shroud has a thermal conductivity of less than 200 W/m·k. 
     
     
         7 . The turbine component of  claim 1 , wherein the inner shroud has a thermal conductivity of greater than 10 W/m·k. 
     
     
         8 . The turbine component of  claim 1 , wherein the inner shroud has a thermal conductivity of about 120 W/m·k. 
     
     
         9 . The turbine component of  claim 1 , wherein the inner shroud and the outer shroud do not bind during operation of the turbine component. 
     
     
         10 . The turbine component of  claim 1 , further comprising an impingement plate positioned between the inner shroud and the outer shroud. 
     
     
         11 . The turbine component of  claim 10 , wherein the impingement plate includes a metal. 
     
     
         12 . The turbine component of  claim 1 , wherein the outer shroud includes an internal cavity. 
     
     
         13 . The turbine component of  claim 12 , wherein the internal cavity is pressurized. 
     
     
         14 . The turbine component of  claim 13 , wherein the internal cavity is pressurized to a pressure equal to or greater than the hot gas path pressure. 
     
     
         15 . The turbine component of  claim 1 , further comprising a transverse gap extending parallel to at least a portion of the inner shroud between the first hook region and the second hook region. 
     
     
         16 . The turbine component of  claim 1 , further comprising an additional inner shroud positioned abutting the inner shroud and extending over the first portion of the outer shroud and the second portion of the outer shroud. 
     
     
         17 . The turbine component of  claim 1 , further comprising an environmental barrier coating positioned on at least a portion of the inner shroud to be contacted by the hot gas path. 
     
     
         18 . The turbine component of  claim 17 , wherein the environmental barrier coating is an abradable rub coat. 
     
     
         19 . A turbine component, comprising:
 an outer shroud; and   an inner shroud having a first hook region extending over a first portion of the outer shroud and a second hook region extending over a second portion of the outer shroud;   wherein the inner shroud includes ceramic matrix composite fibers having a thermal conductivity of less than 200 W/m·k and greater than 10 W/m·k.   
     
     
         20 . A turbine component, comprising:
 an outer shroud; and   an inner shroud having a first hook region extending over a first portion of the outer shroud and a second hook region extending over a second portion of the outer shroud;   wherein the first hook region and the first portion define a first hook gap and the second hook region and the second portion define a second hook gap, the first hook gap and the second hook gap being arranged and disposed to permit the inner shroud to deflect from the outer shroud under thermal loading;   wherein the inner shroud includes ceramic matrix composite fibers having a thermal conductivity of less than 200 W/m·k and greater than 10 W/m·k.