Microstructure and nanomechanical properties of plasma-sprayed nanostructured Yb2SiO5 environmental barrier coatings |
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| Authors: | Tao Zheng Baosheng Xu Shun Wang Donghui Guo Feifei Zhou You Wang Daining Fang |
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| Affiliation: | 1. Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, China;2. Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, China
Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures, Beijing Institute of Technology, Beijing, China;3. Department of Materials Science, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, China |
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| Abstract: | In this study, nanostructured and conventional Yb2SiO5 coatings were prepared by atmospheric plasma. The microstructure and nanomechanical properties of these coatings were compared before and after heat treatment. The results show that the nanostructured Yb2SiO5 coatings have a mono-modal distribution, and the conventional Yb2SiO5 coatings have a bimodal distribution. Both types of coatings had improved nanomechanical properties after heat treatment. However, the increased elastic modulus and nanohardness of the nanostructured Yb2SiO5 coating were more apparent than those of the conventional Yb2SiO5 coatings. The nanostructured Yb2SiO5 coating had a higher elastic modulus than the conventional Yb2SiO5 coating, reflecting its high density. Subsequently, the microscopic morphology and micromechanical properties of the coatings were analyzed after heat treatment. Defects in the coatings, including pores, and microcracks, were significantly reduced with grain growth after thermal treatment, and the nanostructured Yb2SiO5 coatings had improved healing ability and micro-mechanical properties. |
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| Keywords: | environmental barrier coatings microstructure nano-indentation nanostructued Yb2SiO5 coatings plasma spraying |
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