Doped silicon carbide ceramic matrix composite
A method for forming ceramic matrix composite (CMC) component includes forming a fiber preform, positioning the fiber preform into a chemical vapor infiltration reactor chamber, and densifying the fiber preform. Densification includes infiltrating the fiber preform with a first gas comprising precursors of silicon carbide and infiltrating the fiber preform with a second gas comprising a first rare earth element, wherein the steps of infiltrating the fiber preform with the first gas and infiltrating the fiber preform with the second gas are conducted simultaneously to produce a first rare earth-doped silicon carbide matrix in a first region of the component.
1. A ceramic matrix composite component comprising:
a plurality of fibers; and
a ceramic matrix, wherein the plurality of fibers is disposed in the ceramic matrix and wherein the ceramic matrix is divided into a plurality of regions defining different regions of the component, each region comprising a subset of the plurality of fibers, the plurality of regions comprising:
a first region wherein the ceramic matrix comprises silicon carbide doped with a first rare earth element; and
a second region wherein the ceramic matrix comprises silicon carbide doped with a second rare earth element different from the first rare earth element.
2. The ceramic matrix composite of claim 1 , wherein the ceramic matrix further comprises a third region formed of silicon carbide the third region disposed outward from the first region.
3. The ceramic matrix composite of claim 2 , wherein the third region forms an outmost matrix layer.
4. The ceramic matrix composite of claim 1 , wherein the first region comprises a continuous gradient of the first rare earth element.
5. The ceramic matrix composite of claim 1 , wherein the ceramic matrix further comprises a third region formed of silicon carbide, the third region separating the first region and the second region.
6. The ceramic matrix composite of claim 1 and further comprising an interface coating disposed on the plurality of fibers, the interface coating separating the plurality of fibers from the ceramic matrix.
7. A ceramic matrix composite component comprising:
a plurality of fibers; and
a ceramic matrix, wherein the plurality of fibers is disposed in the ceramic matrix and wherein the ceramic matrix is divided into a plurality of regions defining different regions of the component, each region comprising a subset of the plurality of fibers, the plurality of regions comprising:
a first region comprising silicon carbide doped with a first concentration of a first rare earth element; and
a second region disposed outward of the first region, the second region comprising silicon carbide doped with a second concentration of the first rare earth element, the second concentration greater than the first concentration.
8. The ceramic matrix composite of claim 7 , wherein the ceramic matrix further comprises a third region formed of silicon carbide matrix, the third region disposed outward from the second region.
9. The ceramic matrix composite of claim 8 , wherein the third region region forms an outmost matrix layer.
10. The ceramic matrix composite of claim 7 and further comprising an interface coating disposed on the plurality of fibers, the interface coating separating the plurality of fibers from the ceramic matrix.