초록 ▼

A hybrid CMC laminate is comprised of alternating layers of dense ceramics and fiber reinforced CMCs. The strategy involves the use of strong and stiff ceramics in order to delay the onset of cracking within the CMC layers. To provide protection from mechanical abrasion, improve thermal conductivity

A hybrid CMC laminate is comprised of alternating layers of dense ceramics and fiber reinforced CMCs. The strategy involves the use of strong and stiff ceramics in order to delay the onset of cracking within the CMC layers. To provide protection from mechanical abrasion, improve thermal conductivity and inhibit oxygen ingress into the CMC layer, ceramic layers are placed on the outer surfaces of laminate. The laminate is produced by stacking alternating layers of dense ceramic and binderless layers of fiber reinforced CMCs, and then hot-pressing them together. The volume fractions of the constituent layers and the fiber architecture can be readily varied through this process. Reinforcement architecture (unidirectional vs. crossply) and the relative volume fractions of the phases effects the tensile and flexural properties of the laminates.

대표청구항 ▼

[ We claim:] [1.] A method of fabricating a laminate comprising:providing a plurality of sintered ceramic layers and a plurality of fiber reinforced CMC layers;stacking alternate layers of said sintered ceramic and fiber-reinforced CMC layers to form said laminate, having between adjacent ceramic an

[ We claim:] [1.] A method of fabricating a laminate comprising:providing a plurality of sintered ceramic layers and a plurality of fiber reinforced CMC layers;stacking alternate layers of said sintered ceramic and fiber-reinforced CMC layers to form said laminate, having between adjacent ceramic and CMC layers a ceramic/CMC interface;consolidating said fiber-reinforced CMC layers, which include a means for deflecting cracks; andbonding said stacked layers together into an integral body so that cracks do not deflect at said ceramic/CMC interface but travel across said interface and deflect within said CMC layers,wherein fabricating said laminate comprises fabricating each of said sintered ceramic layers from a plurality of tiles in a corresponding plane with said ceramic tiles abutting one another along adjacent edges of said tiles within each plane and each ceramic tile being bonded to each adjoining CMC layer along a broad face of said adjoining CMC layer, and fabricating each of said fiber-reinforced CMC layers as a continuous layer,whereby a high temperature, damage tolerant, thermal shock resistant, oxidation resistant, high strength laminate is obtained, which is resistant to wear, abrasion and has higher thermal conductivity.