Effect of heating-cooling rates on microstructure evolution of ZrB2-based coatings during oxidation |
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| Affiliation: | 1. Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;1. North Caucasus Federal University, Stavropol, 355029, Russia;2. Southern Scientific Center of Russian Academy of Sciences, Rostov-on-Don, 344006, Russia;3. Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, 119991, Russia;4. ILIT RAS — Branch of FSRC “Crystallography and Photonics” of Russian Academy of Sciences, Moscow, 117342, Russia;5. Vladimir State University named after Alexander and Nikolay Stoletovs, Vladimir, 600000, Russia;1. Kyoto Municipal Institute of Industrial Technology and Culture, 91, Chudoji Awatacho, Shimogyo-ku, Kyoto, 600-8815, Japan;2. Department of Applied Chemistry, School of Advanced Engineering, Kogakuin University, Hachioji, 192-0015, Japan;1. Science and Technology on Scramjet Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, Hunan, 410073, China;2. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi, 710072, China;1. Department of Materials Engineering, Tallinn University of Technology, Ehitajate 5, 19086 Tallinn, Estonia;2. Department of Materials Science and Engineering, Aalto University, School of Chemical Technology, POB 16200, Aalto 00076, Finland |
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| Abstract: | In this work, the influence of heating-cooling rates on the microstructure of ultra-high temperature ceramics (UHTCs) during oxidation was firstly reported. Four different kinds of processes (low-heating and low-cooling rates, low-heating and high-cooling rates, high-heating and low-cooling rates, high-heating and high-cooling rates) combined with static oxidation at 1500 °C were applied on ZrB2-SiC-WB composite coatings. The results showed that the oxide layers of the samples presented different microstructure characters under different heating-cooling modes. A relatively thick liquid layer with obvious bubble phenomenon was generated under the high-heating rate, while a thin liquid layer without bubbles was formed under the low-heating rate. Certain amount of sheet B2O3 crystals with large sizes were formed under the high-cooling rate, while did not for the low-cooling rate. The formation mechanisms of these unique microstructures were analyzed and the influence of heating and cooling rates was explained. |
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| Keywords: | Heating-cooling rates Microstructure Oxidation |
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