Thermal Conductivity of Multi-Sized Porous Thermal Barrier Coatings at Micro and Nano Scales after Long-Term Service at High Temperatures

Thermal barrier coatings with multi-sized porous structure at micro and nano scales were prepared with hollow spherical YSZ powders and polypropylene powders through atmospheric plasma spraying. The thermal conductivities of the multi-sized thermal barrier coatings after a long-term serving at high...

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Bibliographic Details
Published in:Coatings (Basel) 2021-10, Vol.11 (10), p.1183
Main Authors: Gao, Pei-Hu, Zeng, Sheng-Cong, Jin, Can, Zhang, Bo, Chen, Bai-Yang, Yang, Zhong, Guo, Yong-Chun, Liang, Min-Xian, Li, Jian-Ping, Li, Quan-Ping, Lu, Yong-Qing, Jia, Lu, Zhao, Dan
Format: Article
Language:English
Subjects:
Atmospheric models
Coatings
Conductivity
Heat conductivity
Heat transfer
High density polyethylenes
High temperature
Laser beam heating
Lasers
Plasma
Plasma spraying
Polymethyl methacrylate
Pore size
Porosity
Protective coatings
Scanning electron microscopy
Simulation
Sintering
Spherical powders
Thermal barrier coatings
Thermal conductivity
Yttria-stabilized zirconia
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Summary:Thermal barrier coatings with multi-sized porous structure at micro and nano scales were prepared with hollow spherical YSZ powders and polypropylene powders through atmospheric plasma spraying. The thermal conductivities of the multi-sized thermal barrier coatings after a long-term serving at high temperature were tested through laser flash heating method. Meanwhile, the physical models of thermal barrier coatings with multi-sized porous structure at micro and nano scales were constructed through Ansys Workbench. The evolutions of thermal conductivity of thermal barrier coatings with multi-sized pores after long-term service at 1100 °C were investigated through computation. It was found that the thermal conductivity of the coating increased with the extension of the serving time. When the serving time reached 60 days, the thermal conductivity of the coating tended to be stable and close to the compacted bulk. The computational results were consistent with the tested ones, which could be helpful to explain the thermal conducting evolution in thermal barrier coatings with multi-sized porous structure at nano and micro scales after long-term serving at high temperature.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings11101183