In this paper, a novel method of preparing porous alumina with alumina powder and boric acid is firstly proposed and experimented, and its mechanism of the fabricating process is also investigated. Unlike traditional methods of manufacturing porous alumina including electrochemical anodization of aluminium and chemical etching, ordered porous alumina has been directly fabricated through synthesis and decomposition reactions between boric acid and alumina. Scanning electron microscopic (SEM) analysis has verified the formation of hexagonal ordered porous alumina with a homogeneous and mean diameter of ∼1 μm after sintering at high temperatures. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) results show that the main component of the structure is pure alumina and no other impurities are detected, indicating an excellent corrosion resistance of the as-received product. Nano-hardness analysis shows a certain mechanical strength of the microstructure. GRAPHICAL ABSTRACT

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一种制备六方有序多孔氧化铝及其形成机理的新方法

本文首先提出并实验了一种用氧化铝粉和硼酸制备多孔氧化铝的新方法，并对其制备过程的机理进行了研究。不同于传统的多孔氧化铝制造方法，包括铝的电化学阳极氧化和化学蚀刻，有序多孔氧化铝是通过硼酸和氧化铝之间的合成和分解反应直接制造的。扫描电子显微镜 (SEM) 分析已证实在高温烧结后形成了均匀且平均直径约为 1 μm 的六方有序多孔氧化铝。透射电子显微镜（TEM）和X射线衍射（XRD）结果表明，该结构的主要成分是纯氧化铝，未检测到其他杂质，表明收到的产品具有优异的耐腐蚀性。纳米硬度分析表明显微组织具有一定的机械强度。图形概要