Direct measurement of interface energies of magnesium aluminate spinel and a brief sintering analysis |
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| Affiliation: | 1. Department of Metallurgical and Materials Engineering, FEI University Center, São Bernardo do Campo, SP 09850-901, Brazil;2. Department of Materials Science and Engineering & NEAT ORU, University of California, Davis, CA 95616, USA;3. Department of Metallurgical and Materials Engineering, University of Sao Paulo, SP, Brazil;1. Department of Metallu rgical and Materials Engineering, Polytechnic School, University of São Paulo (USP), Av. Prof. Mello Moraes n. 2463, 05508−030 São Paulo, SP, Brazil;2. Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616, USA;3. Department of Chemical Engineering (EQA), Federal University of Santa Catarina (UFSC), 88040-900 Florianópolis, SC, Brazil;1. Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia;2. Scientific and Technological Institute of Optical Material Science, VNTs S.I. Vavilov State Optical Institute, St. Petersburg, Russia;3. St. Petersburg State University, St. Petersburg, Russia;4. Lappeenranta University of Technology LUT, Lappeenranta, Finland;1. Department of Materials Science and Engineering, Golpayegan University of Technology, Golpayegan, Iran;2. Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea;1. G.G. Devyatykh Institute of Chemistry of High-Purity Substances RAS, Nizhny Novgorod, Russia;2. N.I. Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia;3. Institute of Applied Physics RAS, Nizhny Novgorod, Russia |
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| Abstract: | Surface and grain boundary energies are key parameters for understanding and controlling microstructural evolution. However, reliable thermodynamic data on interfaces of ceramics are relatively scarce, limiting the realization of their relevance in processes such as sintering and grain growth. In this work, the heat of sintering itself was used to quantify both surface and grain boundary energies in MgAl2O4 spinel. Nanoparticles were compacted and heated inside a Differential Scanning Calorimeter (DSC) when densification and grain growth were observed. The evolved heat signal was quantitatively attributed to the respective microstructural evolution in terms of interfacial area change, allowing determination of average surface and grain boundary energies for MgAl2O4 as 1.49 J m−2 and 0.57 J m−2, respectively. The data was then used to interpret the thermodynamics involved in density and grain growth during isothermal sintering of MgAl2O4. |
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| Keywords: | Sintering Surface energy Grain boundary energy Thermodynamics Magnesium aluminate |
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