The effect of amorphous Si3N4 nanoparticles and magnetized distilled water on the mechanical properties and infrared transmittance of α-Al2O3
Abstract This study resolves the inherent trade-off between fracture toughness and mid-infrared transparency in α-Al2O3 ceramics. A novel shear-stress thin-layer process with magnetic-field-assisted dispersion achieves uniform distribution of 0.1 wt% amorphous Si3N4 nanoparticles and MgO/La2O3 sinte...
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Nature Portfolio
2025-07-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-025-11241-1 |
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| author | Mahdi Darabi Ehsan Mohammad Sharifi Reza Vafaei Akbar Eshaghi Mohammad Reza Loghman-Estarki |
| author_facet | Mahdi Darabi Ehsan Mohammad Sharifi Reza Vafaei Akbar Eshaghi Mohammad Reza Loghman-Estarki |
| author_sort | Mahdi Darabi |
| collection | DOAJ |
| description | Abstract This study resolves the inherent trade-off between fracture toughness and mid-infrared transparency in α-Al2O3 ceramics. A novel shear-stress thin-layer process with magnetic-field-assisted dispersion achieves uniform distribution of 0.1 wt% amorphous Si3N4 nanoparticles and MgO/La2O3 sintering aids using 2 wt% DL dispersant at pH 10. Post-annealing at 1200 °C enhances fracture toughness by 126% (3.4 ± 0.2 to 7.68 ± 0.3 MPa m1/2) while reducing hardness from 23.6 ± 0.8 GPa to 12.6 ± 0.5 GPa, confirming improved ductility. XRD analysis verifies compressive residual stress (− 1.60 ± 0.08 GPa) and lattice strain (− 0.49 ± 0.05%). FESEM/EDS reveals grain refinement from 402 ± 18 nm to 124 ± 6 nm with homogeneity index exceeding 0.93. These microstructural modifications enable 85.3 ± 0.5% mid-infrared transmittance between 3 and 6 μm, surpassing conventional transparent alumina by 41%. This approach establishes a scalable method for designing multifunctional ceramics with simultaneous mechanical resilience and optical performance. |
| format | Article |
| id | doaj-art-02440bfa69a5493d89f4b78cb4e97699 |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Nature Portfolio |
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| series | Scientific Reports |
| spelling | doaj-art-02440bfa69a5493d89f4b78cb4e976992025-08-20T04:01:51ZengNature PortfolioScientific Reports2045-23222025-07-0115112110.1038/s41598-025-11241-1The effect of amorphous Si3N4 nanoparticles and magnetized distilled water on the mechanical properties and infrared transmittance of α-Al2O3Mahdi Darabi0Ehsan Mohammad Sharifi1Reza Vafaei2Akbar Eshaghi3Mohammad Reza Loghman-Estarki4Department of Materials Engineering, Maleke Ashtar University of TechnologyDepartment of Materials Engineering, Maleke Ashtar University of TechnologyDepartment of Materials Engineering, Maleke Ashtar University of TechnologyDepartment of Materials Engineering, Maleke Ashtar University of TechnologyDepartment of Materials Engineering, Maleke Ashtar University of TechnologyAbstract This study resolves the inherent trade-off between fracture toughness and mid-infrared transparency in α-Al2O3 ceramics. A novel shear-stress thin-layer process with magnetic-field-assisted dispersion achieves uniform distribution of 0.1 wt% amorphous Si3N4 nanoparticles and MgO/La2O3 sintering aids using 2 wt% DL dispersant at pH 10. Post-annealing at 1200 °C enhances fracture toughness by 126% (3.4 ± 0.2 to 7.68 ± 0.3 MPa m1/2) while reducing hardness from 23.6 ± 0.8 GPa to 12.6 ± 0.5 GPa, confirming improved ductility. XRD analysis verifies compressive residual stress (− 1.60 ± 0.08 GPa) and lattice strain (− 0.49 ± 0.05%). FESEM/EDS reveals grain refinement from 402 ± 18 nm to 124 ± 6 nm with homogeneity index exceeding 0.93. These microstructural modifications enable 85.3 ± 0.5% mid-infrared transmittance between 3 and 6 μm, surpassing conventional transparent alumina by 41%. This approach establishes a scalable method for designing multifunctional ceramics with simultaneous mechanical resilience and optical performance.https://doi.org/10.1038/s41598-025-11241-1α-Al2O3Amorphous Si3N4 nanoparticlesDispersing agentsMagnetized distilled waterMechanical propertiesInfrared transmittance |
| spellingShingle | Mahdi Darabi Ehsan Mohammad Sharifi Reza Vafaei Akbar Eshaghi Mohammad Reza Loghman-Estarki The effect of amorphous Si3N4 nanoparticles and magnetized distilled water on the mechanical properties and infrared transmittance of α-Al2O3 Scientific Reports α-Al2O3 Amorphous Si3N4 nanoparticles Dispersing agents Magnetized distilled water Mechanical properties Infrared transmittance |
| title | The effect of amorphous Si3N4 nanoparticles and magnetized distilled water on the mechanical properties and infrared transmittance of α-Al2O3 |
| title_full | The effect of amorphous Si3N4 nanoparticles and magnetized distilled water on the mechanical properties and infrared transmittance of α-Al2O3 |
| title_fullStr | The effect of amorphous Si3N4 nanoparticles and magnetized distilled water on the mechanical properties and infrared transmittance of α-Al2O3 |
| title_full_unstemmed | The effect of amorphous Si3N4 nanoparticles and magnetized distilled water on the mechanical properties and infrared transmittance of α-Al2O3 |
| title_short | The effect of amorphous Si3N4 nanoparticles and magnetized distilled water on the mechanical properties and infrared transmittance of α-Al2O3 |
| title_sort | effect of amorphous si3n4 nanoparticles and magnetized distilled water on the mechanical properties and infrared transmittance of α al2o3 |
| topic | α-Al2O3 Amorphous Si3N4 nanoparticles Dispersing agents Magnetized distilled water Mechanical properties Infrared transmittance |
| url | https://doi.org/10.1038/s41598-025-11241-1 |
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