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| 001 | 887815 | ||
| 005 | 20240711085632.0 | ||
| 024 | 7 | _ | |a 10.1111/jace.16932 |2 doi |
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| 024 | 7 | _ | |a 1551-2916 |2 ISSN |
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| 037 | _ | _ | |a FZJ-2020-04441 |
| 082 | _ | _ | |a 660 |
| 100 | 1 | _ | |a Schlup, Andrew P. |0 0000-0001-8403-0490 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Hot‐pressing platelet alumina to transparency |
| 260 | _ | _ | |a Westerville, Ohio |c 2020 |b Soc. |
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| 520 | _ | _ | |a Alumina powder with a platelet morphology was hot‐pressed to transparency with preload pressures of 0‐8 MPa, maximum temperatures of 1750‐1825°C, maximum pressures of 2.5‐80 MPa, and isothermal hold times of 1‐7 hours. Optical transmission (in‐line and total), as well as optical losses (backward/forward scattering and absorption), of the hot‐pressed samples were measured and related to the microstructure. Higher hot‐pressing temperatures increase the in‐line transmission. A gray discoloration of the samples (indicative of high absorption) was minimized by heat treating the powder in air prior to hot pressing and reducing the preload pressure. Maximum pressures above/below 10 MPa increased porosity, which decreased in‐line transmission and increased backward/forward scattering. Lower densities at higher pressures are attributed to a pore‐swelling phenomenon. Increasing isothermal hold time decreased porosity, which increased in‐line transmission and reduced backward/forward scattering. Best optical properties with an in‐line transmission of 65.3% at 645 nm (0.8 mm thick) were achieved by hot‐pressing heat‐treated platelet alumina powder with a preload pressure of 0 MPa, maximum temperature of 1800°C, maximum pressure of 10 MPa, and an isothermal hold time of 7 hours. This high in‐line transmission, despite its large grain size (65 µm), is attributed to crystallographic orientation of the platelets during hot pressing. |
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| 700 | 1 | _ | |a Costakis, William J. |0 0000-0002-0364-7227 |b 1 |
| 700 | 1 | _ | |a Rheinheimer, Wolfgang |0 P:(DE-Juel1)185039 |b 2 |
| 700 | 1 | _ | |a Trice, Rodney W. |0 0000-0002-8685-0289 |b 3 |
| 700 | 1 | _ | |a Youngblood, Jeffrey P. |0 0000-0002-8720-8642 |b 4 |
| 773 | _ | _ | |a 10.1111/jace.16932 |g Vol. 103, no. 4, p. 2587 - 2601 |0 PERI:(DE-600)2008170-4 |n 4 |p 2587 - 2601 |t Journal of the American Ceramic Society |v 103 |y 2020 |x 1551-2916 |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/887815/files/jace.16932.pdf |y Restricted |
| 856 | 4 | _ | |y Published on 2019-11-27. Available in OpenAccess from 2020-11-27. |u https://juser.fz-juelich.de/record/887815/files/A.Schlup_HP_transparent_platelet_Al2O3_JACERS_proof.pdf |
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