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首页> 外文期刊>Journal of Environmental Management >Nano-alumina powders/ceramics derived from aluminum foil waste at low temperature for various industrial applications
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Nano-alumina powders/ceramics derived from aluminum foil waste at low temperature for various industrial applications

机译：低温下源自铝箔废料的纳米氧化铝粉末/陶瓷，适用于各种工业应用

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摘要

In this work, nanoscale single crystalline y- and a-alumina powders have been successfully prepared from aluminum foil waste precursor via co-precipitation method using NH_4OH as a precipitant. The obtained gel after co-precipitation treatment, was calcined at different temperatures (500,700,900,1050, 1100,1300 and 1500 ℃) and the products were characterized by XRD, FTIR and HRTEM. The results revealed that nano-y-Al_2O_3 was fully transformed to nanometer-sized O-Al_2O_3 (36-200 nm) after annealing at temperatures as low as 1100 ℃.The thermally preheated powder at 500 ℃ was further pressed under 95 MPa by the uniaxial press and the obtained bodies were found to have98.82% of the theoretical density, 1.18% porosity and 708 MPa compressive strength, when sintered at temperatures as low as 1600 ℃ without using any sintering aid. These excellent results proved that this work will contribute to finding a commercial source for preparing sub 100 nm a-alumina through the secondary resources management and even more so to synthesizing strong α-Al_2O_3 bodies which are promising in terms of their structure and compression. The α-Al_2O_3 bodies synthesized by the present work could be used as a feedstock for fabrication of various kinds of functional and structural materials that are extensively used in high tech.
机译：在这项工作中，已经成功地使用NH_4OH作为沉淀剂通过共沉淀法从铝箔废料前体制备了纳米级单晶y-和a-氧化铝粉末。共沉淀处理后得到的凝胶在不同温度（500,700,900,1050，1100,1300和1500℃）下煅烧，并通过XRD，FTIR和HRTEM对产物进行表征。结果表明，纳米y-Al_2O_3经1100℃低温退火后完全转变为纳米O-Al_2O_3（36-200 nm）。将500℃热预热粉末在95 MPa压力下进一步加压。在不使用任何烧结助剂的情况下，在低至1600℃的温度下进行烧结时，发现单轴压制机和所获得的物体具有98.82％的理论密度，1.18％的孔隙率和708 MPa的压缩强度。这些优异的结果证明，这项工作将有助于寻找通过二次资源管理制备低于100 nm的a-氧化铝的商业来源，甚至有助于合成坚固的α-Al_2O_3体，这在结构和压缩方面都很有希望。通过本工作合成的α-Al_2O_3体可用作制备广泛用于高科技的各种功能和结构材料的原料。

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