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- W2884404927 abstract "Abstract In comparison with the typically worm-like α-Al 2 O 3 powders formed from an unground Al(OH) 3 precursor calcined at 1450°C, spherical α-Al 2 O 3 powders with ~1 μm in size were prepared by the calcination of a ground Al(OH) 3 precursor with 5 wt.% [NH 4 ] + BF 4 − under the same calcination conditions. The influence of a high-energy ball milling pretreatment as well as of the additives on the morphological evolution of α-Al 2 O 3 powders was studied using the commercial precursor Al(OH) 3 as raw material. The results indicate that the morphology of α-Al 2 O 3 powders is closely related to the morphology of the Al(OH) 3 precursor and to the introduction of different additives. The refinement of the Al(OH) 3 precursor in aggregate size and of the primary crystal size by high-energy ball milling has effectively suppressed the neck growth of α-Al 2 O 3 grains. In contrast to the findings made previously with the introduction of 5 wt.% [NH 4 ] + Cl − , the morphology of the α-Al 2 O 3 particles could be significantly improved from a ground Al(OH) 3 precursor with the addition of 5 wt.% [NH 4 ] + BF 4 − , which resulted in the formation of spherical α-Al 2 O 3 powders with 1 μm size at 1450°C." @default.
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- W2884404927 date "2018-07-05" @default.
- W2884404927 modified "2023-09-28" @default.
- W2884404927 title "Influence of high-energy ball milling and additives on the formation of sphere-like α-Al2O3 powder by high-temperature calcination" @default.
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- W2884404927 doi "https://doi.org/10.1515/znb-2018-0080" @default.
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