Thermal barrier coatings (TBCs) suffer from the thermo-chemo-mechanical coupling action of thermal shock and calcium–magnesium–alumina–silicate (CMAS) corrosion. However, failure mechanism TBCs under synergistic effect CMAS corrosion is still unclear due to a lack an environmental simulator. Herein, 8YSZ ceramic coating deposited on PtAl bond coating/DD419 nickel-based single crystal superalloy...

Thermal barrier coatings (TBCs) protect superalloy components from the extreme heat in gas turbines. Airborne contaminants that interact with TBCs during flight, such as CMAS particulate where C is calcia, M magnesia, A alumina, and S silica, degrade these ceramic coatings. Biofuels can directly introduce some or all same impurities into turbine based on their starting biomass, how they were ha...

Abstract High-entropy alloys (HEAs) represent a relatively new group of multicomponent that have shown great potential for applications requiring tribological and oxidation resistant properties. Consequently, thermally sprayed coatings different HEA chemistries received increasing research attention. In this paper, atomized equimolar CrFeCoNi AlCrFeCoNi feedstocks were used high velocity air-fu...

Solution precursor plasma spray (SPPS) can prepare thermal barrier coatings (TBCs) with nanostructures, which modify the adhesion and wettability of molten silicate environmental deposits (CMAS) on surface TBCs, thereby improving resistance TBCs to CMAS corrosion. In this study, SPPS layers micro-nano double scale structures were prepared conventional atmospheric spraying (APS) coatings. The ef...

Abstract During flight, many silicates (sand, dust, debris, fly ash, etc.) are ingested by an engine. They melt at high operating temperatures on the surface of thermal barrier coatings (TBCs) to form calcium-magnesium-aluminum-silicate (CMAS) amorphous settling. CMAS corrodes TBCs and causes problems, such as composition segregation, degradation, cracking, disbanding. As a new generation TBC c...

Abstract The surface fracture toughness is an important mechanical parameter for studying the failure behavior of air plasma sprayed (APS) thermal barrier coatings (TBCs). As APS TBCs are typical multilayer porous ceramic materials, direct applications traditional single edge notched beam (SENB) method that ignores those structural characters may cause errors. To measure more accurately, effect...

The shortcomings at elevated operation temperatures of the standard material yttria-stabilized zirconia (YSZ) for thermal barrier coatings (TBCs) have initiated many research activities seeking alternatives. One candidate is the pyrochlore lanthanum zirconate La2Zr2O7 (LZ), which is phase-stable to its melting point. At the same time, it shows a lower thermal conductivity and a lower sintering ...

To maximize energy efficiency, gas turbine engines used in airplanes and for power generation operate at very high temperatures, even above the melting point of the metal alloys from which they are comprised. This feat is accomplished in part via the deposition of a multilayer, multicomponent thermal barrier coating (TBC), which lasts up to approximately 40,000 h before failing. Understanding f...

As gas turbine entry temperature (TET) increases, thermal loading on first stage blades increases and, therefore, a variety of cooling techniques and thermal barrier coatings (TBCs) are used. In the present work, steady state blade heat transfer mechanisms were studied via numerical simulations. Convection and radiation to the blade external surface were modeled for a super alloy blade with and...

In this study, (Gd0.9Yb0.1)2Zr2O7 (GYbZ)/yttria-stabilized zirconia (YSZ) double-ceramic-layer (DCL) thermal barrier coatings (TBCs) were prepared by plasma spray-physical vapor deposition (PS-PVD). The microstructure, mechanical performance, and shock behavior of with spraying distances 600, 800, 1000 mm investigated. GYbZ coating a distance 600 showed closely packed columnar structure. Howeve...