Influence of yttria addition on the phase transformations of zirconia from zircon ore by carbothermal reduction process |
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| Affiliation: | 1. Key Laboratory of Processing and Testing Technology of Glass & Functional Ceramics of Shandong Province, School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong 250353, PR China;2. College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, 201306, PR China;1. College of Life and Environmental Science, Guilin University of Electronic Technology, Guilin, 541004, China;2. Institute for Advanced Study, Shenzhen University, Shenzhen, Guangdong, 518052, China;3. College of Life Science, Guangxi Normal University, Guilin, 541004, China;4. College of Environment and Resource, Guangxi Normal University, Guilin, 541004, China;1. Institute of Solid State Chemistry and Mechanochemistry SB RAS, Kutateladze str. 18, Novosibirsk 630128, Russia;2. Novosibirsk State University, Pirogova str. 2, Novosibirsk 630090, Russia;3. Lavrentyev Institute of Hydrodynamics SB RAS, Lavrentyev Ave. 15, Novosibirsk 630090, Russia;1. Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, People''s Republic of China;2. China Automotive Technology and Research Center, 68 East Xianfeng Road, Dongli District, Tianjin 300300, People''s Republic of China |
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| Abstract: | Zircon ore carbothermal reduction with yttria addition has been carried out. The influences of heating temperature and yttria addition on the phase transformations of zirconia from zircon ore by carbothermal reduction have been investigated in detail. The phase transformations of zirconia from zircon ore by carbothermal reduction were monitored by X-ray diffraction. The microstructure and micro-area chemical analysis of the products were characterized by scanning electron microscopy and energy dispersive spectrometer. The chemical states of Zr 3d, Y 3d and O 1s presented in the products of zircon carbothermal reduction with 10 wt% yttria addition were investigated by X-ray photoelectron spectroscopy. The results showed that the optimized heating temperature of zircon carbothermal reduction with no addition was 1600 °C, and the main phase of the products consists of m-ZrO2, c-ZrO2, ZrC and β-SiC. Yttria addition could be introduced into zirconia lattice and caused it to form Y2O3 stabilized zirconia. Zirconia in the products would be turned into partially stabilized zirconia with yttria addition from 1 wt% to 5 wt% while it would exist in the form of fully stabilized zirconia with over 8 wt% yttria addition. |
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