In this paper a functional graded material (FGM) thermal barrier coating (TBC) is prepared using Atmospheric Plasma Spraying (APS) method. The FGM layers were deposited by varying the feeding ratio of CYSZ/NiCrAlY and conventional CYSZ on a NiCrALY-coated Inconel 738 substrates. Hot corrosion behavior, bonding strength and the related failure mechanisms of a conventional TBC and a FGM TBC are i...

Abstract Metallic alloys' behavior at high temperatures, especially their response to corrosion and formation of protective surface layers, has long been a focus scientific inquiry. Although certain alloy compositions require an initiation period before hot advances the propagation stage, no combination alloys can be considered impervious indefinitely. The capacity nickel-based materials tolera...

Thermal barrier coatings (TBCs) are bilayer systems comprising a 7–8 wt% yttria partially stabilized zirconia (YSZ) top coat deposited over metallic bond coat. Suspension plasma spraying (SPS) is an advanced and attractive processing technique due to its capability yield variety of microstructures, including the desired columnar microstructure for enhanced strain tolerance durability. This work...

Gadolinium zirconate (GZ) is an attractive material for thermal barrier coatings (TBCs). However, a single layer GZ coating has poor cycling life compared to Yttria Stabilized Zirconia (YSZ). In this study, Solution Precursor High Velocity Oxy-Fuel (SP-HVOF) spray was used produce double GZ/YSZ TBC and the performance with YSZ TBC. The temperature behaviour of solution precursor studied, splat ...

High-performance gas turbines and aircraft engines necessitate MCrAlY (M = Ni, Co, or Ni/Co) coatings with exceptional oxidation resistance. Pre-heat-treatment can enhance the performance of bond in following ways: First, it reduces porosity coating promotes diffusion elements within it. Second, pre-heat-treatment allows for formation a continuous, dense, moderately thick layer pure Al2O3 scale...

In this article, a theoretical 1-D heat transfer model and conjugate numerical simulation was carried out to evaluate the thermal insulation of TBCs under different factors. The relationship temperature-drop between inner or outer surface barrier coating (TBC) investigated by simulation. effect TBC coupling internal external are obtained, which indicates that film cooling can both contribute an...

Micromechanical models are developed to explore the effect of embedded metal layers upon thermal cycling delamination failure of thermal barrier coatings (TBCs) driven by thickening of a thermally grown oxide (TGO). The effects of reductions in the steady-state (i.e. maximum) energy release rate (ERR) controlling debonding from large interface flaws and decreases in the thickening kinetics of T...

In this paper, a novel concept in the field of phase composite ceramics has been proposed and applied for creating topcoats durable thermal barrier coatings (TBCs), which is one most critical technologies advanced high-efficiency gas turbine engines extreme environments. The ceramic TBCs were designed to demonstrate superior comprehensive performance-related merits, benefits, advantages over co...

The aim of the study was to investigate Mechanisms properties thermal barrier coatings (TBCs) enhance performance evaluation characteristics and develop TBCs.Cobalt –base superalloy has been used as a substrate zirconium stabilized Aluminum ceramic topcoat , in addition include degradation behavior system during cycling (3hr per cycle furnace) failure aluminized due thermally grown oxide (...