Abstract In this work, new double-layer YSZ/La 2 Ce O 7 (LC) + YSZ coatings were developed using air plasma spraying (APS). The surface of the prepared was relatively smooth and consisted melted partially areas. Their resistance to hot corrosion, CaO-MgO-Al 3 -SiO (CMAS), thermal shock examined. added upper layer enhance lanthanum cerate (La , LC) properties. During corrosion tests, salt reacted with layer, CeO phase products identified. main LaVO 4 secondary phases CeVO YVO . SEM confirmed...

Abstract La 2 Ce O 7 (LC) has been identified as a promising thermal barrier coating (TBC) for use up to 1250 °C. In this study, TBC system was deposited on grit-blasted Inconel 738 using atmospheric plasma spraying (APS) with NiCrAlY the bond coat, followed by YSZ, and then LC top layer. The coatings were exposed mixture of molten Na SO 4 (45 wt.%) V 5 (55 at 950 °C hot corrosion. On layer, LaVO , CeVO CeO (1.66–2.00) formed corrosion products after h exposure. A reaction between YSZ could...

Polymer derived ceramic (PDC) polysilazane-based double layer composite coatings on steel substrates consisting of a PDC bond-coat, and PDC-based top-coat containing passive (ZrO 2 ) active (ZrSi fillers, as well specially tailored glass filler with high melting temperature were developed.The corrosion oxidation behaviour the ferritic stainless AISI 441 without coating system was evaluated.SEM examination revealed not dense but contained small closed pores diameter up to 100 nm.Cracks...

Mechanical properties a b s t r c tIn this work, La 2 Ce O 7 /40 wt% YSZ (LC40Z) mixed powders were used to fabricate composite bulk ceramics with their potential use as material for high-performance thermal barrier coatings (TBCs).For purpose, the effect of sintering temperature on chemical reactivity LC and was investigated via hot-pressing at temperatures 1300, 1400 1500 C. X-ray diffraction analysis (XRD), Raman spectroscopy, scanning electron microscopy (SEM) utilized characterize phase...

In this work, the influence of different cleaning procedures on adhesion composite coatings containing passive ceramic and commercial glasses was investigated. Two compositions (C2c, D2-PP) double-layer polymer-derived (PDC) coating systems, composed from bond coat a top coat, were developed. order to obtain adherent coatings, stainless steel substrates cleaned by four procedures. The then deposited onto substrate via spray coating. Pretreatment subsequent ultrasonic in acetone, ethanol...

Abstract This study describes an oxidation and corrosion resistant environmental barrier coating (EBC) applied to AISI 441 stainless steel substrate. For this purpose, four polymer‐derived ceramic (PDC) systems were developed. These consisted of a bond coat by dip coating, top‐coat that was loaded with passive fillers deposited spray coating. The microstructures the coatings investigated using optical microscopy scanning electron microscopy, including energy dispersive spectroscopy (EDS)....

Abstract The crystallization of glass microspheres in the Y 2 O 3 –Al -system produced from precursor powders four different nominal compositions via flame synthesis is analyzed detail by electron microscopy with a focus on backscatter diffraction (EBSD). Growth models are formulated for individual crystallized during as well after an additional heat treatment step. 16 types bodies cataloged future reference. They presented without regard their relative occurrence; some extremely rare but...

In this work, La2Ce2O7-yttria-stabilized zirconia (LC-YSZ) composites with different weight fractions of YSZ (40–70 wt.%) were prepared by hot pressing at 1400 °C and investigated as a material for thermal barrier-coating (TBC) applications. For purpose, the effect addition on phase composition, microstructure, mechanical performance behavior was studied. X-ray diffraction analysis showed that LC-YSZ mainly composed cubic ZrO2 La2O3-CeO2-ZrO2 solid solution pyrochlore structure, indicating...

This work is aimed at the development and investigation of oxidation behavior ferritic stainless-steel grade AISI 441 polymer-derived ceramic (PDC) protective coatings. Double-layer coatings a PDC bond coat below top with glass passive fillers’ oxidative resistance were studied temperatures up to 1000 °C in flow-through atmosphere synthetic air saturated water vapor. Investigation oxide products formed surface samples vapor atmospheres, different (900, 950, °C) exposure times (24, 96 h) was...

This work focuses on the fabrication of lanthanum cerate (La2Ce2O7, LC) powders via two chemical routes: modified Pechini sol-gel method and solid-state synthesis. The synthesized LC were heat treated in temperature range 1000-1400 °C for 6 h investigated as a material thermal barrier coating (TBC) applications. For this purpose, powder morphology, composition, crystal structure stability studied. Scanning electron microscopy (SEM) revealed an agglomerated consisting fine uniformly...

Abstract This article features the oxidation behavior of ferritic stainless steel grade AISI 441 coated with protective polymer‐derived ceramics (PDC). Two PDC compositions are studied respect to their resistance in a flow‐through atmosphere synthetic air at temperatures up 1000°C. The coatings contain combination six passive fillers: Y‐containing ZrO 2 , glass microspheres, alumina‐yttria‐zirconia (AYZ) powder, and three commercial glasses. They pyrolyzed for 1 hour 800°C heating cooling...

Five compositions in the system Al2O3-Y2O3 with high level of homogeneity were prepared form glass microspheres by flame synthesis. The amorphous nature glasses highly disordered structure was confirmed X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman and nuclear magnetic resonance (NMR) spectroscopy. In NMR spectra, typical signals chemical shifts 75, 42 12 ppm observed, which attributed to presence AlO4, AlO5 AlO6 motifs structure. ratio individual samples did...

Y2O3 ceramics containing up to 4 at.%Zn2+ were prepared by infiltrating a zinc acetate water solution into pre-sintered matrix of Y2O3. After pressureless sintering for 2 h at 1400 °C, ZnO grains dispersed in an identified. The photoluminescence (PL) spectra the Y2O3:ZnO exhibit very broad emission band over entire visible spectral range with intensity maximum about 570−590 nm. PL increases increasing concentration additive Zn2+, reaching between 3 and at.%. annealing temperature also...