Thermal conductivity of EB-PVD thermal barrier coatings evaluated by a steady-state laser heat flux technique

Thermal and Environmental Barrier Coating Development for Advanced Propulsion Engine Systems

“…Figure 9 shows the sintering and creep strain kinetics of a baseline turbine airfoil ZrO 2 -7wt%Y 2 O 3 thermal barrier coating, derived from the surface wedge crack-opening displacements after testing for various times with temperature gradients (ref. 13). It can be seen that the sintering and creep strains are on the magnitude 2 percent approximately at 1316 °C (2400 °F) following 1300 hr exposure.…”

Avaliação da Resistência à Oxidação de Camadas de Ligação de Revestimentos Utilizados em Barreiras Térmicas

“…Os TBCs que trabalham em temperaturas superiores a 1000 °C são produzidos a partir de zircônias estabilizadas com ítria, cálcia, magnésia ou céria, entre outros óxidos dopantes. Os revestimentos mais duráveis são aqueles obtidos com zircônias estabilizadas com 6 a 8% em peso de ítria conhecidos como YSZ (Ytria Stabilized Zirconia) [4][5][6].…”

Thermal Conductivity and Stability of HfO 2 −Y 2 O 3 and La 2 Zr 2 O 7 Evaluated for 1650°C Thermal/Environmental Barrier Coating Applications

“…A schematic diagram of the test rig is illustrated in Figure 2. The general test approaches have been described elsewhere [1][2][3][4]. In this steady-state laser heat-flux thermal conductivity test, the specimen surface heating was provided by the laser beam, and backside air cooling was used to maintain the desired specimen temperatures.…”

“…The advanced 1650 °C T/EBC system is required to have significantly increased phase stability, lower lattice and radiation thermal conductivity, and improved sintering and thermal stress resistance under the engine high-heat-flux and severe thermal cycling conditions. Advanced heat-flux testing facilities [1][2][3] and approaches [3][4][5][6][7] have been established for the 1650 °C coating development. The simulated combustion watervapor environment is also being incorporated into the heat-flux test capabilities [3].…”