Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Production and characterization of zirconia-alumina ceramic composites, reinforced with rare earth oxides (Y2O3 and La2O3), for application as TBC in the exhaust nozzles of gas turbines
Submission Author:
Bruna Amorim Lima Advincula da Rocha , PE
Co-Authors:
Bruna Amorim Lima Advincula da Rocha, Renata Domingues, Yogendra Prasad Yadava
Presenter: Yogendra Prasad Yadava
doi://10.26678/ABCM.COBEM2023.COB2023-2269
Abstract
Industrialization has driven research towards maximizing the efficiency of processes and equipment, and ceramics have been widely used in the industry to meet this demand. The aerospace sector, which deals with high pressure, temperature, and friction, has greatly benefited from the application of ceramics. One of the devices that suffers from the harsh conditions this sector imposes are the exhaust nozzles of gas turbines. Previous studies have shown that ceramic composites with a metallic matrix, such as zirconia, have improved mechanical properties that can be optimized by adding oxides such as alumina. To improve their mechanical strength and fracture toughness and reduce their inherent fragility, additives such as rare earth oxides, can be incorporated. The present work aims to determine the suitability of zirconia-alumina ceramic composites reinforced with lanthania and yttria, both rare earth oxides, as a thermal barrier coating in the aerospace industry. The composites were produced by thermomechanical processing and sintered at 1350 ºC for 12 hours. Structural and microstructural characterization was carried out using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM), and mechanical properties were evaluated using Vickers microhardness (HV).
Keywords
aerospace sector, exhaust nozzles, thermal barrier coating, ZrO2-Al2O3-Y2O3, ZrO2-Al2O3-La2O3
