In situ formation of transparent spinel with the spark plasma sintering of magnesia-alumina nanocomposite granules without the help of sintering aid
| Autor: | A. Alhaji, Fatemeh Davar, Nasrin Heidari |
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| Rok vydání: | 2022 |
| Předmět: |
Nanocomposite
Materials science Process Chemistry and Technology Spinel Composite number Nanoparticle Sintering Spark plasma sintering engineering.material Surfaces Coatings and Films Electronic Optical and Magnetic Materials Fracture toughness Materials Chemistry Ceramics and Composites engineering Composite material Porosity |
| Zdroj: | Ceramics International. 48:1633-1641 |
| ISSN: | 0272-8842 |
| Popis: | In this project, magnesia-alumina composite granules were prepared via the spray drying method. Next, the synthesized powder was sintered at 1400 °C–1500 °C by the spark plasma sintering method under the pressure of 100 MPa without using any sintering aids. The effects of two sintering temperatures (1400 °C and 1500 °C) on the phase evolution, density, fracture toughness, and light transmission of the samples in the visible and IR range were investigated. SEM results indicated that the magnesia-alumina composite granules had spherical morphology with a mean particle size of 7-8 μm. The XRD pattern showed that after spark plasma sintering at 1400 °C and 1500 °C, magnesium aluminate phase spinel was obtained from the penetration and reaction of alumina and magnesia nanoparticles. The disc sintered at 1400 °C had more transparency than the sample sintered at 1500 °C within the UV–Vis and middle IR region because of the lower porosity of the sample. The magnesium aluminate spinel sintered at 1400 °C had a density of 99.98% theoretical density, hardness of 18 GPa, and fracture toughness of 1.6 MPam1/2. |
| Databáze: | OpenAIRE |
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