Filament dispersion process
AssigneeRtx Corporation
InventorsBrendan Lenz, John D. Riehl, Nil Parikh, Olivier H. Sudre
Life of this patent
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Abstract
A method of spreading fibers of a tow including heat treating a fibrous preform having a plurality of tows and a resin mixture including an alcohol soluble binder, washing the fibrous preform with a solution of water and a water-soluble binder such that the solution occupies an intra-tow space of the plurality of tows, freezing the solution in the intra-tow space of the plurality of tows, and freeze-drying the fibrous preform. The method also includes making a CMC from the fibrous preform with spread tows.
Claims18
A method of spreading fiber tows comprising:
- subjecting a fibrous preform to heat treatment, the fibrous preform comprising a plurality of tows and a resin mixture comprising 15 wt % to 60 wt % of an alcohol soluble binder and a solvent, wherein said heat treatment is sufficient to remove at least 99% of the solvent,
- washing the fibrous preform, after said heat treatment, with a solution of water and a water-soluble binder such that the solution occupies an intra-tow space of the plurality of tows,
- freezing the solution in the intra-tow space of the plurality of tows, and
- freeze-drying the fibrous preform including the frozen solution in the intra-tow space of the plurality of tows.
A method of manufacturing a ceramic matrix composite comprising:
- subjecting a fibrous preform to a heat treatment, the fibrous preform comprising a plurality of tows and a resin mixture comprising 15 wt % to 60 wt % of an alcohol soluble binder and a solvent, wherein said heat treatment is sufficient to remove at least 99% of the solvent,
- washing the fibrous preform, after said heat treatment, with a solution of water and a water-soluble binder such that the solution occupies an intra-tow space of the plurality of tows,
- freezing the solution in the intra-tow space of the plurality of tows,
- freeze-drying the fibrous preform including the frozen solution in the intra-tow space of the plurality of tows,
- heating the freeze dried fibrous preform to remove the water-soluble binder, and
- densifying the fiber preform after heating the fiber preform.
Dependencies are inferred from the claim text.