Highly dense spinel ceramics with completely suppressed grain growth prepared via SPS with NaF as a sintering additive |
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| Affiliation: | 1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China;2. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, 621900, China;3. Center of Materials Research and Analysis, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, China;1. Emerging Materials Research Unit, Ferhat Abbas University Setif 1, Algeria;2. Optics and Precision Mechanics Institute, Ferhat Abbas University Setif 1, Algeria;3. University of Lyon – INSA Lyon, Laboratory MATEIS, Villeurbanne, France;1. Instituto Politécnico Nacional-ESIQIE, Dept. of Metallurgical and Materials Engineering, Unidad Professional Adolfo López Mateos, Lindavista, 07738, Ciudad de México, Mexico;2. Université de Lyon, INSA-Lyon, MATEIS (UMR CNRS 5510), Bât. Blaise Pascal, F-69621, Villeurbanne, France |
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| Abstract: | For the preparation of transparent spinel ceramics it is common practice to use LiF as a sintering additive to achieve transparency. However, it is well known that in this case the grain size exhibits a significant increase compared to pure spinel ceramics, which can lead to a deterioration in mechanical properties. The findings of this paper indicate that when NaF is used as a sintering additive for the preparation of spinel ceramics via spark plasma sintering (SPS) translucent materials with a high level of densification can be obtained without observable grain growth. It is shown that the grain size after SPS at 1500 °C with 1 h dwell is essentially the same as the primary particle size of the spinel powder, whereas pure spinel ceramics prepared via SPS under the same conditions exhibit grain growth by approximately a factor 5. |
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| Keywords: | Spinel Spark plasma sintering (SPS) Sintering additives Sodium fluoride Transparent ceramics |
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