Engineered SiC-SiC composite and monolithic SiC layered structures

A multilayer ceramic structure formed by a chemical vapor deposition process or a chemical vapor infiltration process, comprising a chamber including an external shell and a hollow space inside the external shell, wherein the external shell includes:

• an inner composite layer including a first composite structure, wherein the first composite structure comprises a first ceramic matrix reinforced by a first composite reinforcement comprising at least one of (1) ceramic additives at a first loading amount or (2) ceramic fibers arranged at a first reinforcement orientation,
• a middle composite layer placed outside of the inner composite layer, the middle composite layer including a second composite structure that is different from the first composite structure, and wherein the second composite structure comprises a second ceramic matrix reinforced by a second composite reinforcement comprising at least one of (1) ceramic whiskers at a second loading amount or (2) ceramic fibers arranged at a second reinforcement orientation, and
• an outer ceramic impermeable monolithic layer that is placed outside of the middle composite layer.