Comparative study on effect of oxide thickness on stress distribution of traditional and nanostructured zirconia coating systems

Effect of TiC self-healing coatings on the cyclic oxidation resistance and lifetime of thermal barrier coatings

“…The results revealed that TGO grew more in conventional TBC than TiC-self-healing TBCs. The EDS analysis of cross-section morphologies (in Fig.13) suggest that the dark curves in BCs might consist of Al 2 O 3 mainly, and some NiO could also be found in those curves [27]. The EDS results imply that the dark curves shown in the analysis are TGO in BC [28] The feedstock particles of BC is kind of intermetallic compound and consists of Al and Ni, NiAl.…”

Effect of heat treatment on deformation and mechanical properties of 8 mol% yttria-stabilized zirconia by Berkovich nanoindentation

“…For an axisymmetric indenter and elastically isotropic half spaces, the relationship between reduced Young's modulus E r and Young's modulus E of the coating can be expressed using the equations: 1/E r = (1 − 2 /E) + (1 − 2 i /E i ) and E r = (1/2ˇh c ) /24.5(dp/dh) [27], where E i = 1141 GPa and i = 0.07 are the Young's modulus and Poisson's ratio of the diamond indenter, ˇ is a constant and equals to 1.034 for a Berkovich indenter [27], the contact depth h c before unloading is estimated from the P-h curve, and dP/dh is the slope of the unloading curve. In this work, the Poisson's ratio of 8YSZ is assumed to be 0.1 [38]. As shown in Fig.…”

Numerical Parametric Analysis of Bond Coat Thickness Effect on Residual Stresses in Zirconia-Based Thermal Barrier Coatings

“…The analysis model had four layers: Nibased superalloy substrate, NiCrAlY bond-coating, Al 2 O 3 thermally grown oxide (TGO) and ceramic top coat. Thermal and mechanical performance parameters of the materials used in the analysis were acquired from literature and are given in Table 1 [1,[25][26][27].…”

“…Thermal barrier coatings (TBCs) are commonly used as protective coatings for hot-section metal components in gas turbines which allow increase in gas inlet temperature and thus improve performance and thermal efficiency of turbine engines [1][2][3][4]. Thermal insulation capability and high temperature stability are the key performance parameters of TBCs.…”

“…Enhanced jet engine efficiencies necessitated significant increase in combustion temperatures and operating pressures. These requirements have proved to be a big driving force to improve the TBC technology, such as novel compositions, production techniques and improvement in microstructure, and physical and mechanical properties of TBCs [1]. Nanostructured yttria-stabilized zirconia coatings (nano-YSZ) due to their potential superior mechanical and physical properties over traditional coatings have received wide interest in the last decade [6][7][8][9][10][11].…”