Interface Design for Oxidation‐Resistant Ceramic Composites

TLDR

Fiber‑reinforced ceramic composites attain high toughness through distributed damage mechanisms that rely on matrix cracks deflecting into fiber/matrix interfacial debonding, yet the oxidation resistance of the fiber coatings limits long‑term performance. The study reviews alternative oxide and non‑oxide fiber coatings and identifies future research directions. The authors review alternative oxide coatings, discuss processing challenges such as coating application and fiber strength loss, and examine design mechanics for crack‑deflecting coatings and their impact on composite systems. The review demonstrates that design considerations for crack‑deflecting coatings influence both coating and composite system performance.

Abstract

Fiber‐reinforced ceramic composites achieve high toughness through distributed damage mechanisms. These mechanisms are dependent on matrix cracks deflecting into fiber/matrix interfacial debonding cracks. Oxidation resistance of the fiber coatings often used to enable crack deflection is an important limitation for long‐term use in many applications. Research on alternative, mostly oxide, coatings for oxide and non‐oxide composites is reviewed. Processing issues, such as fiber coatings and fiber strength degradation, are discussed. Mechanics work related to design of crack deflecting coatings is also reviewed, and implications on the design of coatings and of composite systems using alternative coatings are discussed. Potential topics for further research are identified.