With the application of shrouds made of silicon carbide ceramic matrix composite(SiC-CMCs),the abradable coating technology suitable for SiC-CMCs is urgently needed. The four-layer structure of BSAS(Ba0.75Sr0.25Al2Si2O8)-polyester-based abradable environmental barrier coating (A/EBCs) was prepared by atmospheric plasma spraying. The influence of process parameters on the porosity and the structural evolution of the layer at 1300 ℃ were investigated. The phase structure,microstructure and coating composition were characterized by XRD,SEM,EDS and TEM respectively. The results show that the porosity of BSAS-polyester abradable top layer is 26.4%-36.8%. And the temperature-sensitive parameters of BSAS-polyester particles are primary gas (argon) flow,second gas (hydrogen) flow and spraying distance. In contrast,the speed-sensitive parameters are primary gas (argon) flow. The primary gas (argon) flow has the opposite effect on the particle temperature and velocity of the BSAS-polyester. The abradable surface layer is oxidized at 1300 ℃ for 300 h and maintains monoclinic phase structure,stable stucture and composition,and locally precipitates spherical amorphous silicon oxide particles. Furthermore,the coating abradability was evaluated by high-temperature and high-speed scraping test. Nano-scale Ni-based superalloy particles adhesion on the surface of the coating are found,and the blade incursion depth ratio (IDR) is 20%,which meets the requirements of the abradable sealing coating.
Preparation and performance of abradable environmental barrier coating on ceramic matrix composites
2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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