Research Progress on Sintering Resistance of Ceramic Thermal Protective Coatings

Ceramic thermal protective coatings subjected to long-term service in high-temperature environments are prone to internal micro-pore shrinkage, grain coarsening, and collapse of the porous structure, forming a compacted structure. This consequently degrades the durability and safety of the ceramic coatings. This paper elucidated the sintering densification mechanism of ceramic coatings. It analyzed both innovations in material systems and multi-dimensional structural optimization of coatings, summarizing domestic and international research progress on the sintering densification resistance of ceramic coatings. The limitations of traditional techniques that inhibit high-temperature sintering densification through “passive pore retention” were highlighted. A novel approach based on phase transformation-induced pore formation to achieve “active in-situ pore generation” was explored. Building on this, future research directions for enhancing the sintering densification resistance of ceramic thermal barrier coatings were proposed.