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NANOCRYSTALLINE ALPHA ALUMINA (amp;-AI203) AND METHOD FOR MAKING THE SAME
NANOCRYSTALLINE ALPHA ALUMINA (amp;-AI203) AND METHOD FOR MAKING THE SAME
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机译:纳米Alpha氧化铝(&-AI203)及其制造方法
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摘要
A process for producing metastable nanocrystalline alpha-alumina (α-Al2O3) having particle sizes smaller than 12 nm. Starting crystallites of α-Al2O3 having a particle size larger than 12 nm, typically on the order of about 50 nm, are ball-milled at low temperatures to produce a nanocrystalline α-Al2O3 powder having a particle size of less than 12 nm, i.e., below the theoretical room temperature thermodynamic size limit at which α-Al2O3 changes phase to γ-Al2O3, wherein the powder remains in the α-Al2O3 phase at all times.
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机译:一种制备具有小于12nm的粒径的亚稳态纳米晶体α-氧化铝(α-Al2 O 3)的方法。在低温下球磨粒度大于12 nm,通常约为50 nm的α-Al2O3起始微晶,以生产粒度小于12 nm(即小于12 nm)的纳米晶α-Al2O3粉末低于理论室温的热力学尺寸极限(在该温度下,α-Al2O3将相转变为γ-Al2O3),其中粉末始终保持在α-Al2O3相中。
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