Fabrication and investigation of Ca/Tb co-doped HfO2 infrared coatings |
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| Affiliation: | 1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;2. Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China;3. Center for Materials Research and Analysis, Wuhan University of Technology, Wuhan 430070, China;4. New Industry Creation Hatchery Center, Tohoku University, Sendai 980-8577, Japan;5. Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521000, China;6. Wuhan University of Technology Advanced Engineering Technology Research Institute of Zhongshan City, Xiangxing Road 6, Zhongshan 528400, China;1. Department of Materials Science and Engineering, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan;2. Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan;1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China;2. School of Materials Science and Engineering, Shenzhen University, Shenzhen 518055, China;1. Department of Mechanical Engineering, The University of Akron, Akron, OH, USA;2. AlphaSTAR Corporation, Long Beach, CA, USA;3. NAVAIR, Patuxent River, MD, USA;1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;2. Science and Technology on Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China;3. National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing 100081, China;4. Beijing Institute of Technology Chongqing Innovation Center, Chongqing 401120, China;5. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;6. State Key Lab of New Ceramic and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | In this study, Ca/Tb co-doped HfO2 coatings were prepared by atmosphere plasma spraying. The chemical composition, morphology and infrared property of the coatings were characterized. The coatings possessed a layer-stacked morphology. When the Ca/Tb doping atomic ratio was 1:1, the phase of the coatings gradually changed from monoclinic to cubic with increasing the doping mass. The CTH2 coating had the highest emissivity which was 0.820 in 0.75–6.5 µm and 0.902 in 6.5–15 µm respectively. The enhancement in short band was mainly due to the introduction of Ca2+ and Tb3+ ions that generated oxygen vacancies in the lattice forming impurity levels within the forbidden band, moreover, the transfer of Tb3+ to Tb4+ increased the concentration of free electrons, which promoted the absorption of free carriers. The increase in long band attributed to the lattice distortion that reduced the lattice symmetry and strengthened the absorption of lattice polar vibration. |
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| Keywords: | Infrared coating Ca/Tb co-doped Oxygen vacancies Lattice distortion |
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