Characterization of nanostructured MgAl2O4 ceramics fabricated by spark plasma sintering
| Autor: | M. Hamidouche, Guillaume Bonnefont, Gilbert Fantozzi, Mostafa Kolli, S. Benaissa |
|---|---|
| Přispěvatelé: | Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Friction Spinel Sintering Spark plasma sintering 02 engineering and technology engineering.material 01 natural sciences [SPI.MAT]Engineering Sciences [physics]/Materials Fabrication Fracture toughness Relative density 0103 physical sciences Materials Chemistry Ceramic materials Ceramic 010302 applied physics Friction coefficients Process Chemistry and Technology Metallurgy Sintering temperatures 021001 nanoscience & nanotechnology Microstructure Grain size Surfaces Coatings and Films Electronic Optical and Magnetic Materials Wear of materials visual_art Transparent Ceramics and Composites engineering visual_art.visual_art_medium MgAl Indentation 0210 nano-technology Vickers microhardness Grain size and shape Tribological behaviors |
| Zdroj: | Ceramics International Ceramics International, Elsevier, 2016, 42 (7), pp.8839-8846. ⟨10.1016/j.ceramint.2016.02.130⟩ |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2016.02.130⟩ |
| Popis: | cited By 6; International audience; The aim of this work is to investigate the effect of sintering temperature on the properties of nanostructured spinel (MgAl2O4)fabricated by Spark Plasma Sintering (SPS). The starting material was a pure spinel (MgAl2O4) nanopowder. The sintering was carried out at T=1300 °C, 1350 °C and 1400 °C under a pressure of 73 MPa.The samples sintered at 1300 °C exhibit a finer microstructure (mean grain size is about ∼250 nm) than those sintered at 1350 °C and 1400 °C. The relative density is about 99.93% at 1300 °C, 99.63% at 1350 °C and 99.58% at 1400 °C due to the presence of some porosity in the fabricated samples. Samples sintered at 1300 °C have a good transmittance (70% at 550 nm and 78% at 1100 nm) compared to those sintered at 1350 °C and 1400 °C. Due to their high density and fine grain size, samples sintered at 1300 °C exhibit a Vickers micro-hardness Hv=18 GPa, elastic modulus E=228 GPa relatively more important than those measured on samples sintered at 1350 °C (Hv=15 GPa, E=172 GPa,) and at 1400 °C (Hv=12 GPa, E=136 GPa). They present the reverse behavior for fracture toughness kIC (1.05 MPa √m for samples sintered at 1300 °C, 1.43 MPa √m for samples sintered at 1350 °C and 2.23 MPa √m for that sintered at 1400 °C). The tribological behavior of the MgAl2O4ceramic was equally studied: the friction coefficient μ is measured and increases with sintering temperature μ=0.06, μ=0.13, μ=0.18, respectively for sintering temperature of 1300 °C, 1350 °C and 1400 °C. The wear behavior is also examined and the mass loss increases with increasing sintering temperature. © 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved |
| Databáze: | OpenAIRE |
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