A comprehensive review on oxidation-induced self-healing ceramic composites for high-temperature applications

The unique capacity of oxidation-induced self-healing ceramic composites (OISHCCs) to self-heal fractures and improve mechanical properties at high temperature is drawing interest. In order to overcome the limitations of conventional ceramics, this paper investigates different composites containing healing agents (HAs), sintering additives, and healing activators within matrices, which produce oxidative products to recover mechanical properties. This review comprehensively discusses the manufacturing processes, healing mechanisms, and testing methodologies with an emphasis on enhancing self-healing capability of OISHCCs under service circumstances. Notably, we have reviewed the testing approaches of OISHCCs, which were conducted at several temperatures, that is, ≥673 K, and their respective high-temperature potential applications are listed. This review includes recent developments in rapid and repetitive fracture healing and mechanical performance recovery. However, understanding the intricate relationships between matrices, HAs, oxidative products, and oxidation kinetics which are essential for optimal composite design remains difficult, though. One important technique for examining and improving material performance is the coupling of experimental methods with finite element analysis (FEA). However, optimizing OISHCCs for realistic high-temperature applications is still difficult despite advancements. Hence, this paper outlines the present status of OISHCCs, identifies persistent issues, and makes recommendations for future research, with a focus on practical applications.