Thermal cycling behavior and failure mechanism of LaTi2Al9O19/YSZ thermal barrier coatings exposed to gas flame

Dielectric resonators with complex crystal structures in the La2O3–Al2O3–TiO2 system for microwave applications

“…The XRD patterns of both the samples are found to be matching with each other. The diffraction peaks indicate low symmetry and complex atoms arrangement within the unit cell as reported earlier [17,18]. LTAO19 and LTAO37 samples are sintered at various temperatures to obtain good experimental density.…”

“…High dielectric constant (e r [ 20), high quality factor (Q = 1/tan d [ 5,000) and near zero temperature coefficient of resonant frequency (s f * 0 ppm/°C) are the prerequisite for a ceramic material to be used as dielectric resonator. Microwave ceramics such as Ba 2 Ti 9 O 20 [1], (Zr 0.8 Sn 0.2 )TiO 4 [2], Ba(Mg 1/3 Ta 2/3 )O 3 [3,4], Ba 6-3x-Ln 8?2x Ti 18 O 54 (Ln = lanthanides) [5] etc. have already proved their utility in variety of wireless communication devices.…”

“…LaTi 2 Al 9 O 19 is an excellent thermal barrier coating (TBC) material, by virtue of its reduced thermal diffusivity due to complex crystal structure, which increases scattering center and decreases mean free path of phonons [17,18]. Materials with magnetoplumbite structure, like LaTi 2 Al 9 O 19 with Ti-Al matrix are interesting host materials for radwaste disposal and its relationship to phases that might be implicated in the evolution of solar nebulas [7,[19][20][21].…”

Plasma sprayed nanostructured GdPO4 thermal barrier coatings: Preparation microstructure and CMAS corrosion resistance

“…Additionally, many newly developed TBCs reveal unsatisfactory thermal cycling lifetime compared with YSZ when CMAS attack is absence. To exploit the advantage of these TBC candidates, they have been designed as an outer ceramic layer in double‐ceramic‐layer (DCL) TBCs, with an inner layer of YSZ . DCL TBCs have proved to have desirable thermal cycling lifetime, especially in CMAS corrosion condition.…”

Precipitation phases in the nickel-based superalloy DZ 125 with YSZ/CoCrAlY thermal barrier coating

“…To meet the requirements of an increase of turbine inlet temperature and thermal efficiency in modern advanced gas turbine, thermal barrier coatings (TBCs) have been widely applied onto the surfaces of the gas turbine components by various methods such as plasma spraying and electron beam physical vapor deposition (EB-PVD). The application of TBCs greatly enhances the operating temperature and efficiency of gas turbine, and significantly improves the component durability [4][5][6]. State-of-the-art TBCs usually consist of PtAl diffusion or MCrAlY overlay bond coat (BC) and ceramic top coat.…”