Ceramic matrix composite
A novel ceramic matrix composite is disclosed for forming components that are operable in high temperature environments such those in gas turbine engines and the like. The ceramic matrix composite can include at least one layer of non-crimped fibers positioned substantially parallel to one another. A relatively small diameter elastic fiber can be constructed to stitch the non-crimped fibers together and a ceramic matrix may be deposited around the at least one layer of non-crimped fibers.
1. A method comprising:
stitching a layer of non-crimped fibers together by bending an elastic fiber around a portion of the non-crimped fibers, the elastic fiber having a diameter which is less than a diameter of the non-crimped fibers;
forming the layer of non-crimped fibers into a core preform shape; and
infiltrating the core preform shape with a ceramic matrix to form a non-finished ceramic matrix composite component.
2. The method of claim 1 further comprising:
coating the non-crimped fibers prior to the infiltrating the core preform shape with a material at least partially made from boron nitride.
3. The method of claim 1 further comprising:
at least one of dissolving or removing by heating the elastic fiber from the core preform shape prior to the infiltrating by exposing the elastic fiber to at least one of a liquid, a gas or heat in a vacuum.
4. The method of claim 1 further comprising:
processing the non-finished ceramic matrix composite component to make a finished component that is operable in a gas turbine engine.
5. The method of claim 1 further comprising:
processing the non-finished ceramic matrix composite component with at least one of a machining, a grinding, a sanding, and/or a coating operation.
6. The method of claim 1 , wherein the non-crimped fibers are positioned substantially parallel to one another.
7. The method of claim 1 , further comprising:
soaking the core preform shape in water; and
drying the core preform shape in an oven.
8. The method of claim 1 , wherein the elastic fiber is made from at least one of a polymer material, an acrylic material, and a carbon material.
9. The method of claim 1 , wherein the non-crimped fibers comprise a mono filament and wherein a cross sectional diameter of the non-crimped fibers is between approximately 20 and 300 microns.
10. A method comprising:
stitching a plurality of layers of non-crimped fibers, the non-crimped fibers of each of the plurality of layers of non-crimped fibers being stitched together by bending an elastic fiber around a portion of each of the non-crimped fibers;
forming the plurality of layers of non-crimped fibers into a core preform shape;
coating the non-crimped fibers with a material at least partially made from boron nitride; and
after coating the non-crimped fibers, infiltrating the core preform shape with a ceramic matrix to form a non-finished ceramic matrix composite component.
11. The method of claim 10 , further comprising arranging the plurality of layers such that the non-crimped fibers of a first portion of the plurality of layers is positioned substantially orthogonally to the non-crimped fibers of a second portion of the plurality of layers.
12. The method of claim 10 , further comprising stitching an adjacent pair of the plurality of layers of non-crimped fibers to each other by stitching the elastic fiber between the adjacent pair of the plurality of layers of non-crimped fibers.
13. The method of claim 10 , wherein at least one layer includes a non-crimped fiber orientation that is different from a non-crimped fiber orientation of an adjacent layer.
14. The method of claim 10 , wherein the component includes at least one of a static turbine vane and a rotatable turbine blade.
15. The method of claim 10 , wherein at least two of the plurality of layers are arranged in a first orientation and at least one of the plurality of layers is arranged in a second orientation which is angularly different from the first orientation.
16. The method of claim 10 , wherein a majority of the plurality of layers are arranged in a span-wise orientation and a minority of the plurality of layers are arranged in a chord-wise orientation.
17. A method comprising:
stitching a layer of non-crimped fibers together by bending an elastic fiber around a portion of the non-crimped fibers;
forming the layer of non-crimped fibers into a core preform shape;
infiltrating the core preform shape with a ceramic matrix to form a non-finished ceramic matrix composite component; and
at least one of dissolving or removing by heating the elastic fiber from the core preform shape prior to the infiltrating by exposing the elastic fiber to at least one of a liquid, a gas or heat in a vacuum.
18. The method of claim 17 , wherein the elastic fiber is made of a polymer material dissolvable in water.
19. The method of claim 17 , wherein the elastic fiber is made of an acrylic material removable by heating in a vacuum.
20. The method of claim 17 , further comprising laminating a plurality of layers of the non-crimped fibers together before at least one of dissolving or removing by heating the elastic fiber form the core preform shape.