Grain growth stagnation in the dense nanocrystalline yttria prepared by combustion reaction and quick pressing with an ultra-high heating rate |
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| Affiliation: | 1. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;2. Department of Environmental Engineering, Sun Moon University, Chungnam 336-708, Republic of Korea;3. Extreme Energy-Density Research Institute, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata 940-2188, Japan;1. Department of Chemistry and Technology of Polymers, Cracow University of Technology, 24 Warszawska Street, 31-155 Cracow, Poland;2. Institute of Inorganic Chemistry and Technology, Cracow University of Technology, 24 Warszawska Street, 31-155 Cracow, Poland;1. Ceramics Laboratory, Swiss Federal Institute of Technology, EPFL, CH-1015 Lausanne, Switzerland;2. Graduate School at Shenzhen, Tsinghua University, 518055 Shenzhen, China;3. MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington, New Zealand;4. Institute of Physics AS CR, Na Slovance 2, 182 21 Prague 8, Czech Republic;1. INNOVNANO, Materiais Avançados, SA, 3040-570 Antanhol, Portugal;2. CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa and CEMOP-UNINOVA, 2829-516 Caparica, Portugal;3. CQFM and IN, Departamento de Eng. Química, Instituto Superior Técnico, Universidade Técnica de Lisboa, 1049-001 Lisboa, Portugal;1. State Key Laboratory of New Ceramics & Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. Science and Technology on Advanced Functional Composites Laboratory, Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China;3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;1. Departamento de Ingeniería Mecánica, Energética y de los Materiales, Universidad de Extremadura, 06006 Badajoz, Spain;2. Instituto de Cerámica y Vidrio, Consejo Superior de Investigaciones Científicas, 28049 Madrid, Spain |
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| Abstract: | Combustion reaction plus quick pressing was a developing technique that used the Joule heating effect of combustion reaction to sinter ceramics, and allows very high heating rate, short soaking duration and high pressure for densification of ceramics. By taking advantages of the particular conditions of this method, pure yttria ceramics with a relative density of 98.5% and an average grain size of 50 nm were obtained at 1620 K and 170 MPa. Moreover, the investigation on the grain growth of sintered yttria was carried out by analyzing the microstructure evolutions and responsible mechanisms. The combined effect of the ultra-high heating rate and the high pressure applied on compact at the peak temperature was effective in suppressing particle coarsening and enhancing densification. Besides, under the decreased sintering temperature and soaking duration, the retained nanostructure assisted to inhibit final-stage grain growth while without impeding the further densification of nanocrystalline ceramics. |
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| Keywords: | Grain growth Densification Yttria Heating rate Nanocrystalline ceramics |
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