Abstract
It is important to investigate the mechanical performances of (Gd0.9Yb0.1)2Zr2O7 (GYbZ) materials deposited on irregular substrates for improving new thermal barrier coatings. Three-point bending fracture characteristics of freestanding GYbZ coating prepared by supersonic plasma sprayed (SPS) technique were investigated with the help of digital image correlation technique. The cracking time, crack propagation path, and mechanical properties of GYbZ coating were obtained. Meanwhile, the X-ray computed tomography technique was introduced to scan the microstructure of freestanding GYbZ coatings, which are used to establish three-dimensional (3D) finite element model by using the Avizo software. The brittle cracking criterion was applied to describe the bending fracture process of GYbZ coatings. The critical cracking strain was estimated as 0.36%±0.03% by repeatedly comparing the difference between the experimental and simulated curves. The results would be extended to predict the dangerous region and failure mechanisms of GYbZ coatings deposited on irregular substrate during finite element simulations.
Highlights
Thermal barrier coatings (TBCs) with lower thermal conductivities and higher thermal insulation capabilitiesX
EDS analysis shows that the GYbZ coating mainly contains 30% O, 41% Zr, 24% Gd, and about 1% Yb, which indicates it has relatively few impurities during the preparation process
The bending characteristics of GYbZ coating were measured with the aid of digital image correlation (DIC) technique
Summary
Thermal barrier coatings (TBCs) with lower thermal conductivities and higher thermal insulation capabilitiesX. Thermal barrier coatings (TBCs) with lower thermal conductivities and higher thermal insulation capabilities. As a classical ceramic top coat material, 6–8 wt% yttria stabilized zirconia (YSZ) had attracted the attention of numerous researchers owing to its excellent properties such as low thermal www.springer.com/journal/40145. J Adv Ceram 2019, 8(4): 564–575 conductivity and high thermal expansion coefficients (TECs). Zhang et al [14] systematically investigated the thermophysical properties of Yb2O3 doped Gd2Zr2O7 and obtained many interesting results. They found that (Gd1−xYbx)2Zr2O7 exhibited lower thermal conductivities and higher thermal expansion coefficients (TECs) than Gd2Zr2O7. It may be attributed to excellent thermal insulation properties and high coefficient of thermal expansion of GYbZ coating
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