| ZHOU Fei-fei,LIU Min,DENG Chun-ming,ZHANG Xiao-feng,WANG You.Nanostructured La2(Zr0.75Ce0.25)2O7 Spherical Feedstocks for Plasma Sprayed Ultra-high Temperature Thermal Barrier Coatings[J],49(4):98-103 |
| Nanostructured La2(Zr0.75Ce0.25)2O7 Spherical Feedstocks for Plasma Sprayed Ultra-high Temperature Thermal Barrier Coatings |
| Received:August 10, 2019 Revised:April 20, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2020.04.012 |
| KeyWord:plasma sprayed ultra-high temperature thermal barrier coatings nanostructure La2(Zr0.75Ce0.25)2O7 spherical feedstocks granulation |
| Author | Institution |
| ZHOU Fei-fei |
1.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin , China; 2.National Engineering Laboratory for Modern Materials Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
| LIU Min |
2.National Engineering Laboratory for Modern Materials Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
| DENG Chun-ming |
2.National Engineering Laboratory for Modern Materials Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
| ZHANG Xiao-feng |
2.National Engineering Laboratory for Modern Materials Surface Engineering Technology, Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou , China |
| WANG You |
1.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin , China |
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| Abstract: |
| The work aims to prepare nanostructured La2(Zr0.75Ce0.25)2O7 spherical feedstocks for thermal sprayed ultra-high temperature with nanopowder granulation technology, and then fabricate nanostructured thermal barrier coatings with thermal spraying method to meet the service temperature requirements of the next-generation thermal barrier coatings. The La2(Zr0.75Ce0.25)2O7 nanopowders synthesized by chemical co-precipitation were used as raw materials to prepare nanostructured La2(Zr0.75Ce0.25)2O7 feedstock by ball milling, spray drying and heat treatment. The nanostructured La2(Zr0.75Ce0.25)2O7 thermal barrier coatings were prepared by atmospheric plasma spraying. Microstructure and morphologies of original nanopowders, nanostructured feedstocks and as-sprayed coating were analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). In addition, the composition of nanostructured feedstocks was analyzed by inductively coupled plasma-atomic emission spectrometry (ICP-AES). The as-prepared nanostructured La2(Zr0.75Ce0.25)2O7 feedstocks were spherical with smooth surface. The composition of feedstocks was basically consistent with stoichiometric ratio. Compared with the original nanopowders, the grain growth of feedstocks was not significant. Some grains of as-sprayed coatings grew up, but the nanostructure still remained. Therefore, the nanostructured La2(Zr0.75Ce0.25)2O7 spherical feedstocks and nanostructured thermal barrier coatings have been successfully prepared, which are expected to be the next-generation ultra-high temperature thermal barrier coatings. |
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