The thermal insulation properties of barrier coatings (TBCs) can be significantly improved with increasing the coating thickness. However, due to weak bonding high-thickness TBCs, low reliability and short lifetime greatly limits their application under some severe operating conditions. In this study, a novel high-efficiency synchronous dual powder feeding method is used deposit series gradient...

Air plasma sprayed thermal barrier coatings (TBCs) are widely used in gas turbines to provide insulation for the metallic engine components. During service, multi-layered and multi-material systems undergo mechanical degradation. The degradation mechanisms include sintering, phase transformation, residual stress, oxidation, erosion CMAS attack. leads initiation propagation of cracks at or near ...

Electron beam (EB) physical vapour deposited (PVD) thermal barrier coatings (TBCs) have been used in gas turbine engines for a number of years. The primary mode of failure is attributed to oxidation of the bondcoat and growth of the thermally grown oxide (TGO), the alumina scale that forms on the bondcoat and to which the ceramic top coat adheres. Once the TGO reaches a critical thickness the T...

The non-contact long pulse thermography method is commonly used to detect the defects in thermal barrier coatings (TBCs). profile of interfacial defect TBCs can be monitored by infrared camera under irradiation excitation source. Unfortunately, always blurry due heat diffusion between area and intact area. It difficult quantify size TBCs. In this work, combined with derived one-dimensional cond...

Upconversion luminescence imaging of thermal barrier coatings (TBCs) has been shown to successfully monitor TBC delamination progression during interrupted furnace cycling. However, furnace cycling does not adequately model engine conditions where TBC-coated components are subjected to significant heat fluxes that produce through-thickness temperature gradients that may alter both the rate and ...

Thermal barrier coatings (TBCs) prolong the durability of gas turbine engine components and enable them to operate at high temperature. Several degradation mechanisms limit TBCs during their service. Since atmospheric plasma spray (APS) processed 7–8 wt.% yttria stabilized zirconia (YSZ) widely utilized for applications are susceptible erosion damage, this work aims evaluate influence porosity ...

Abstract To prevent volcanic ash corrosion using thermal barrier coatings (TBCs), a novel method Al 2 O 3 -modification was proposed to reduce molten CMAS wettability on TBCs surface through lotus effect. Plasma spray-physical vapor deposition (PS-PVD), third-generation for fabrication, adopted deposit 7YSZ with feather-like microstructure. Then, modification introduced fabricate dense overlay ...

Thermal barrier coatings (TBCs) are widely used to protect gas turbine blades but internal stress near the interface in TBCs is one of main causes thermal failure under cycling. A non-destructive inspection technique based on Eu3+ photoluminescence piezospectroscopy has been successfully analyze residual TBCs, systematic and quantitative evaluation data processing still needed, especially with ...

Abstract With the adoption of thermal barrier coatings (TBCs) to protect hot parts gas turbines at end last century, characterization their thermophysical properties and evaluation state integrity has become necessary. That leads development and/or adaptation photothermal thermographic techniques meet newly requirements that have emerged. Whereas this is not an all-encompassing review all liter...

The failure of plasma-sprayed thermal barrier coatings (TBCs) during service is usually related to the cracking behavior. In this study, TBCs were prepared with two kinds agglomerated sintered yttria-stabilized zirconia (YSZ) powders different particle sizes. evolution mechanical properties and crack propagation behavior whole life stage studied by a shock test. effect powder size on was analyz...