Method of producing machined CMC surfaces without exposing fiber
AssigneeRolls-Royce High Temperature Composites Inc.
InventorsJeffrey Crutchfield, Pathikumar Sellappan, Chris Downie, Christopher Mara, Sungbo Shim
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Abstract
A method to produce a ceramic matrix composite part, wherein the method comprises providing a ceramic fiber preform. Wherein the ceramic fiber preform includes a three-dimensional framework of a plurality of ceramic fibers. The method comprising, prior to melt infiltration, adding a layer of machinable stock to a target area of the ceramic fiber preform, melt infiltrating the ceramic fiber preform, forming the ceramic matrix composite part by cooling the melt infiltrated ceramic fiber preform, and machining the part in the target area where the machinable stock is located.
Claims20
A method to produce a ceramic matrix composite part, the method comprising:
- providing a ceramic fiber preform, the ceramic fiber preform including a three-dimensional framework of a plurality of ceramic fibers;
- prior to melt infiltration, adding a layer of machinable stock to only a target area of the ceramic fiber preform, wherein the target area comprises less than a total surface area of the ceramic matrix composite part;
- melt infiltrating the ceramic fiber preform;
- forming the ceramic matrix composite part by cooling the melt infiltrated ceramic fiber preform;
- machining the part in the target area where the machinable stock is located;
- and forming a precision feature in the machinable stock disposed on the target area.
A method to produce a ceramic matrix composite part, the method comprising:
- providing a ceramic fiber preform, the ceramic fiber preform including a three-dimensional framework of a plurality of ceramic fibers;
- slurry infiltrating the ceramic fiber preform
- adding a layer of ceramic machinable stock to a only target area of the ceramic fiber preform, wherein the target area is an area of the ceramic matrix composite part with precision machined surface features, wherein the target area comprises less than a total surface area of the ceramic matrix composite part;
- melt infiltrating the ceramic fiber preform;
- forming the ceramic matrix composite part by cooling the melt infiltrated ceramic fiber preform;
- machining the part in the target area where the machinable stock is located;
- and
- forming a precision feature in the machinable stock disposed on the target area.
Dependencies are inferred from the claim text.