Numerical Simulation of Stress in Conventional and Functionally Graded Thermal Barrier Coating YSZ/ NiCrAlY and Comparison with Results of the Nano-Indentation Stress Measurement Method

Document Type : Research Article

Authors

1 PhD Iran university of science & Technology Assistant Prof., Young Researchers and Elite Club-Tehran East Branch- Islamic Azad University, Tehran, Iran

2 Assistant Prof., Faculty of Electrical- Mechanical and Construction Engineering-Automative Engineering – Standard Research Institute, Karaj, Iran

3 Assistant Prof., School of Engineering- Tehran East Branch- Islamic Azad University, Tehran, Iran

4 Materials and Energy Research Center

Abstract

Thermal barrier coatings (TBCs) are one of the most conventionally- used protective materials which are employed as insulation media to save underlying metallic substrate from harmful effects at high temperature services In this study, a finite element-based numerical method was developed to simulate stress distribution in conventional and functionally graded thermal barrier coatings applied on the Hastelloy-x. Comparisons of simulation model results with experimental results of nano-indentation stress measurement method showed good agreement. The results of simulation showed that in samples after thermal shock without oxidation time (without Thermally Grown Oxide layer-TGO), the average value of the maximum stress is 29 MPa in duplex TBC (interface of top coat /boncoat), 3.15 MPa in three-layer FG-TBC system (interface of 50% NiCrAlY - 50% YSZ / YSZ) and 1.8 MPa in five-layer FG-TBC system (interface of 25% NiCrAlY- 75% YSZ / YSZ). Also, the stress distribution is more uniform in five-layer FG-TBC system that helps to increase the performance and extend the life time of thermal barrier system.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 51, Issue 5
November and December 2019
Pages 1131-1146

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