Hybrid sandwich ceramic matrix composite
AssigneeThe Boeing Company
InventorWilliam P. Keith
Life of this patent
Estimating the term…
Abstract
A hybrid sandwich ceramic matrix composite (CMC) may comprise a first facesheet, a second facesheet, and a core between and bonded to both of the first facesheet and the second facesheet. The first facesheet and the second facesheet may each include filaments in a ceramic matrix. The hybrid sandwich CMC may be configured for exposure to a thermal gradient in which the first facesheet is exposed to a higher temperature environment than the second facesheet. The first facesheet and the second facesheet may have at least closely matching coefficients of thermal expansion, and the first facesheet may have a higher compressive strength than the second facesheet.
Claims18
A hybrid sandwich ceramic matrix composite (CMC), comprising:
- a first facesheet including filaments in a ceramic matrix;
- a second facesheet including filaments in a ceramic matrix;
- and
- a core between and bonded to both of the first facesheet and the second facesheet, the hybrid sandwich CMC being configured for exposure to a thermal gradient in which the first facesheet is exposed to a higher temperature environment than the second facesheet, the first facesheet and the second facesheet having at least closely matching coefficients of thermal expansion, and the first facesheet having a higher compressive strength than the second facesheet, a diameter of the filaments in the first facesheet being greater than a diameter of the filaments in the second facesheet.
A hybrid sandwich ceramic matrix composite (CMC), comprising:
- a first facesheet including filaments in a ceramic matrix;
- a second facesheet including filaments in a ceramic matrix;
- and
- a core between and bonded to both of the first facesheet and the second facesheet, the first facesheet and the second facesheet having at least closely matching coefficients of thermal expansion but differing in at least one of a diameter of the filaments, a chemistry of the filaments, a degree of orthotropy, and an interface strength between the filaments and the ceramic matrix, the hybrid sandwich CMC being configured for exposure to a thermal gradient in which the first facesheet is exposed to a higher temperature environment than the second facesheet, the first facesheet having a higher compressive strength than the second facesheet, an interface strength between the filaments and the ceramic matrix of the first facesheet being stronger than an interface strength between the filaments and the ceramic matrix of the second facesheet.
A method for fabricating a hybrid sandwich ceramic matrix composite (CMC), comprising:
- laying up a first facesheet on a tool, the first facesheet including pre-preg layers of filaments in a ceramic matrix;
- laying up a core on the first facesheet;
- laying up a second facesheet on the core to provide a layup stack, the second facesheet including pre-preg layers of filaments in a ceramic matrix, the first facesheet and the second facesheet having at least closely matching coefficients of thermal expansion, the first facesheet having a higher compressive strength than the second facesheet, a diameter of the filaments in the first facesheet being greater than a diameter of the filaments in the second facesheet;
- curing the layup stack at a first temperature;
- and
- sintering the layup stack at a second temperature to provide the hybrid sandwich CMC, the hybrid sandwich CMC being configured for exposure to a thermal gradient in which the first facesheet is exposed to a higher temperature environment than the second facesheet.
A hybrid sandwich ceramic matrix composite (CMC), comprising:
- a first facesheet including filaments in a ceramic matrix;
- a second facesheet including filaments in a ceramic matrix;
- and
- a core between and bonded to both of the first facesheet and the second facesheet, the hybrid sandwich CMC being configured for exposure to a thermal gradient in which the first facesheet is exposed to a higher temperature environment than the second facesheet, the first facesheet having more of the filaments oriented in the 0° and/or 90° directions than in other directions such that the first facesheet is more highly orthotropic than the second facesheet.
Dependencies are inferred from the claim text.