2004
DOI: 10.1016/j.scriptamat.2003.09.001
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Formation of nano-sized alumina by in-flight oxidation of aluminium powder in a thermal plasma reactor

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Cited by 63 publications
(25 citation statements)
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“…Fig.4. It is clear that the morphologies of precursors change from the elongated fibrillar bundles (Fig.4(a)) to amorphous powders with increasing molar ratio of SO 4 2− to NO 3 − , which is better than the precursor prepared by aluminium nitrate with the loosen characteristics ( Fig.2(b)); when the molar ratio of SO 4 2− to NO 3 − reaches 20:80, the morphology of the precursor becomes from fibre to sphericity (Fig.4(b)); when the molar ratio of SO 4 2− to NO 3 − reaches 30:70, the spherical morphology of precursor is inerratic (Fig.4(c)), but the particle size distribution is asymmetry; when the molar ratio of SO 4 2− to NO 3 − reaches ‫,06׃04‬ the product consists of regular granular precipitates ( Fig.4(d)), with uniform particle size distribution. So SO 4 2− is helpful for the morphology of precursor to change into sphericity.…”
Section: Effect Of CLmentioning
confidence: 97%
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“…Fig.4. It is clear that the morphologies of precursors change from the elongated fibrillar bundles (Fig.4(a)) to amorphous powders with increasing molar ratio of SO 4 2− to NO 3 − , which is better than the precursor prepared by aluminium nitrate with the loosen characteristics ( Fig.2(b)); when the molar ratio of SO 4 2− to NO 3 − reaches 20:80, the morphology of the precursor becomes from fibre to sphericity (Fig.4(b)); when the molar ratio of SO 4 2− to NO 3 − reaches 30:70, the spherical morphology of precursor is inerratic (Fig.4(c)), but the particle size distribution is asymmetry; when the molar ratio of SO 4 2− to NO 3 − reaches ‫,06׃04‬ the product consists of regular granular precipitates ( Fig.4(d)), with uniform particle size distribution. So SO 4 2− is helpful for the morphology of precursor to change into sphericity.…”
Section: Effect Of CLmentioning
confidence: 97%
“…And the larger the molar ratio of SO 4 2− to NO 3 − is, the more inerratic the spherical morphology becomes. 4 2− and NO 3 − on surface area and particle size of precursor The particle size and surface area of the four precursors A′, B′, C′ and D′ are shown in Fig.5. It can be concluded that with the increase of SO 4 2− , the particle size increases and the surface area decreases.…”
Section: Effect Of CLmentioning
confidence: 99%
“…[17][18][19][20] In light of this, absorptivity drops to a 1 ¼ 0.041 at 1165 K [8] for which corresponding surface temperature (T surf ) at end of residence time (t res ) is melting point (MP) of alumina (2327 K) [17] and material is removed by melting and expulsion of melt. Following this, absorptivity increases to a 2 ¼ 0.05 [8] so that surface temperature is the dissociation/vaporization temperature (VT) (3250 K) [17] and vaporization causes machining. Finally, absorptivity jumps to a 3 ¼ 0.32 and remains constant at this value till a depth of 0.63 mm was machined in 2.36 ms (residence time predicted above) by vaporization.…”
Section: Single Pass Machiningmentioning
confidence: 99%
“…Currently, the preparation methods of ultrafine and near-monodisperse alumina particles [4][5][6][7][8][9] are classified into three categories: solid phase, liquid phase, and vapor phase synthesis methods. Solid phase methods include thermal dissociation and mechanical milling.…”
Section: Introductionmentioning
confidence: 99%