Repair of ceramic vane using over-wrap fiber ply and re-stagger
A method of repairing a ceramic vane includes providing a ceramic vane that includes a platform and an airfoil section that extends from the platform. The platform includes a mounting surface for supporting the ceramic vane and the airfoil section includes a damaged region. An over-wrap fiber ply is wrapped around the airfoil section and covers the damaged region. The over-wrap fiber ply is then densified with a ceramic matrix material to form a ceramic matrix composite over-wrap repair layer. A build-up layer is applied to the at least one mounting surface. A desired stagger angle is provided to the ceramic vane by adjusting a thickness and contour of the at least one build-up layer.
1 . A method of repairing a ceramic vane of a gas turbine engine, the method comprising:
providing a ceramic vane that includes at least one platform and an airfoil section that extends from the at least one platform, the at least one platform includes at least one mounting surface for supporting the ceramic vane and the airfoil section includes a damaged region;
wrapping at least one over-wrap fiber ply around the airfoil section, the at least one over-wrap fiber ply covering the damaged region;
densifying the at least one over-wrap fiber ply with a ceramic matrix material to thereby form a ceramic matrix composite over-wrap repair layer;
applying at least one build-up layer to the at least one mounting surface; and
providing a desired stagger angle to the ceramic vane by adjusting a thickness and contour of the at least one build-up layer.
2 . The method as recited in claim 1 , wherein the damaged region includes at least one of spall, cracking, erosion, or recession.
3 . The method as recited in claim 1 , wherein the at least one mounting surface is on the at least one platform.
4 . The method as recited in claim 1 , wherein the at least one over-wrap fiber ply includes a ceramic fiber ply.
5 . The method as recited in claim 1 , wherein the ceramic vane is a ceramic matrix composite.
6 . The method as recited in claim 1 , wherein the build-up layer is at least one fiber ply.
7 . The method as recited in claim 1 , wherein the build-up layer is a coating.
8 . The method as recited in claim 1 , wherein the at least one mounting surface is a substantially axially-facing surface.
9 . The method as recited in claim 1 , wherein the at least one over-wrap fiber ply, once wrapped, includes a downstream-facing seam in which the at least one over-wrap fiber ply overlaps itself.
10 . The method as recited in claim 1 , further comprising, prior to the wrapping, removing a barrier coating from the ceramic vane and, after the densifying, applying a new barrier coating on at least the ceramic matrix composite over-wrap repair layer.