Damage tolerant gas turbine component
A damage tolerant component ( 90 ) for use in a high temperature combustion gas environment. The component includes a plurality of ceramic tiles ( 94 ) bonded to a substrate ( 92 ) for isolating any impact damage to the damaged tile(s). A grout ( 98 ) may fill gaps between adjacent tiles to blunt any crack tip extending from a damaged tile. Ceramic tile insulation may be applied in two layers ( 56, 58 ) with the material properties of the two layers being different, such as with a bottom layer selected for its thermal insulating properties and a top layer selected for its impact resistance properties. A layer of sealing material ( 100 ) may be applied over at least a portion of the ceramic tiles.
1. A damage tolerant apparatus for use in a hot combustion gas environment, the apparatus comprising:
a substrate;
a monolithic layer of ceramic insulating material disposed over a first portion of the substrate;
a plurality of individual tiles of ceramic insulating material disposed over a second portion of the substrate and defining gaps between adjacent tiles; and
a grout deposited to fill the gaps as a barrier to passage of hot combustion gas through the gaps and effective to smooth a flow of the hot combustion gas across a top surface of the tiles and effective to blunt any crack tip extending from any of the individual tiles.
2. The apparatus of claim 1 , wherein the grout is selected to have mechanical properties different than those of the tiles.
3. The apparatus of claim 2 , wherein the grout comprises a ceramic material selected to have an elastic modulus that is lower than an elastic modulus of the ceramic insulating material of the tiles.
4. The apparatus of claim 1 , wherein the grout comprises one of the group consisting of mullite, monazite, sheelite, and submicron blends of alumina-zirconia, alumina-hafnia, and alumina-ceria.
5. The apparatus of claim 1 , wherein the tiles are selectively fired before being bonded to the substrate to control an amount of shrinkage experienced by the tiles after bonding.
6. The apparatus of claim 1 , further comprising a layer of sealing material disposed over at least a portion of the plurality of individual tiles.
7. The apparatus of claim 1 , further comprising a layer of sealing material disposed over at least a portion of the grout.
8. A damage tolerant apparatus for use in a hot combustion gas environment, the apparatus comprising;
a substrate;
a monolithic layer of ceramic insulating material disposed over a first portion of the substrate;
a plurality of individual tiles of ceramic insulating material disposed over a second portion of the substrate and defining gaps between adjacent tiles; and
a grout deposited to fill the gaps as a barrier to passage of hot combustion gas through the gaps and effective to smooth a flow of the hot combustion gas across a top surface of the tiles and effective to blunt any crack tip extending from any of the individual tiles, wherein the grout is selected to have mechanical properties different than those of the tiles and comprises a ceramic material selected to have an elastic modulus that is lower than an elastic modulus of the ceramic insulating material of the tiles and comprises one of the group consisting of mullite, monozite, sheelite, and submicron blends of alumina-zirconia, alumina-hafnia, and alumina-ceria.
9. The apparatus of claim 8 , wherein the tiles are selectively fired before being bonded to the substrate to control an amount of shrinkage experienced by the tiles after bonding.
10. The apparatus of claim 8 , further comprising a layer of sealing material disposed over at least a portion of the plurality of individual tiles.
11. The apparatus of claim 8 , further comprising a layer of sealing material disposed over a portion of the grout.