Articles for creating hollow structures in ceramic matrix composites
The present disclosure relates to a method of fabricating a ceramic composite components. The method may include providing at least a first layer of reinforcing fiber material which may be a pre-impregnated fiber. An additively manufactured component may be provided on or near the first layer. A second layer of reinforcing fiber, which may be a pre-impregnated fiber may be formed on top the additively manufactured component. A precursor is densified to consolidates at least the first and second layer into a densified composite, wherein the additively manufactured material defines at least one cooling passage in the densified composite component.
1. A method of fabricating a composite component comprising: at least partially covering a core having an organic binder and at least a silicon component with a reinforcing fiber material, wherein the core is a non-fugitive hollow core which includes at least one portion having a non-linear geometry, wherein the non-fugitive hollow core is formed by:
(a) contacting a cured portion of a workpiece with a liquid photopolymer;
(b) irradiating a portion of the liquid photopolymer adjacent to the cured portion through a window contacting the liquid photopolymer; and
(c) removing the workpiece from the uncured liquid photopolymer; wherein the non-fugitive hollow core comprises at least one hollow passage, wherein the hollow passage defines at least one cooling passage, wherein at least partially covering the core further comprises:
placing the non-fugitive hollow core on at least one first layer of the reinforced fiber material, wherein the reinforced fiber material is pre-impregnated with a ceramic matrix precursor material, wherein the at least one first layer comprises a plurality of layers of either fabric or pre-impregnated fabric with a matrix precursor: and
adding at least one second layer of pre-impregnated reinforcing fiber material on top of the non-fugitive hollow core, wherein the at least one second layer comprises a plurality of layers of fabric or pre impregnated fabric, wherein the at least one first layer and the at least one second layer are densified to consolidate the at least one first layer and the at least one second layer of reinforcing fiber material.
2. The method of claim 1 , wherein the silicon component comprises at least one of Si, SiO, and SiO2.
3. The method of claim 1 , further comprising:
performing an infiltration process with a ceramic matrix precursor material, wherein the precursor is densified and consolidates the at least one first layer and the at least one second layer of the reinforcing fiber material into a densified composite, wherein the non-fugitive hollow core defines the at least one cooling passage in the densified composite component.
4. The method of claim 1 , wherein the reinforcing fiber material is pre-impregnated with a ceramic matrix precursor material.
5. The method of claim 1 , wherein the organic binder is C—H—O.
6. The method of claim 3 , wherein the infiltration process is a chemical vapor infiltration.
7. The method of claim 3 , wherein the infiltration process is a melt infiltration.
8. The method of claim 3 , wherein the infiltration process is a polymer impregnation and pyrolysis.
9. The method of claim 1 , wherein the composite component is at least a portion of at least one of a shroud, combustion liner, fuel nozzle, swirler, compressor blade, turbine blade, and turbine vein.