共查询到17条相似文献,搜索用时 156 毫秒
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在直流恒电压条件下,以草酸为电解液制备了多孔氧化铝模板。采用扫描电子显微镜对多孔氧化铝模板的形貌进行表征。氧化铝模板的厚度测量表明,当氧化时间为6h时,氧化膜厚度达到最大值35.0mm。根据氧化过程的j-t曲线研究了多孔氧化铝模板的形成过程。 相似文献
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纳米有序多孔阳极氧化铝制备方法的研究进展 总被引:1,自引:0,他引:1
多孔阳极氧化铝(PAA)模板以六角形元胞紧密排列,孔径大小可调,且化学稳定性好,近年来在催化、传感、过滤和仿生等领域受到了越来越多的关注。PAA模板的制备一直以来都是研究的热点,因为模板的结构和性质直接影响其应用的效果。本文在简要介绍了自组织有序多孔阳极氧化铝的特点及影响因素的基础上,较为全面地综述了制备自组织PAA模板不同方法的研究进展,包括温和阳极氧化法、强烈阳极氧化法、脉冲式阳极氧化法和周期性阳极氧化法。具体分析了不同阳极氧化方法的特点以及各自得到的氧化铝模板不同的特点和应用范围,说明了氧化电压、氧化温度和电解液种类在制备PAA模板时对其孔洞尺寸的重要作用,最后对阳极氧化铝膜的发展前景进行了展望。 相似文献
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以铝箔为阳极,石墨为阴极,草酸为电解液,采用二次阳极氧化法制备透明氧化铝薄膜。采用金相显微镜观察一次阳极氧化和二次阳极氧化后氧化铝薄膜的表面形貌,并用X射线衍射仪对氧化铝薄膜结构进行表征。结果表明,二次阳极氧化工艺对氧化铝薄膜的质量有重要的影响。采用退火-除油-浸蚀-电化学抛光-一次阳极氧化-二次阳极氧化工艺,并严格控制工艺参数,可以制备结构良好的透明氧化铝薄膜,且氧化铝薄膜是非晶态结构。 相似文献
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Lan Shen Mubarak Ali Zhengbin Gu Bonggi Min Dongwook Kim Chinho Park 《Korean Journal of Chemical Engineering》2013,30(1):221-227
Anodized aluminum oxide (AAO) nanotemplates were prepared using the Al/Si substrates with an aluminum layer thickness of about 300 nm. A two-step anodization process was used to prepare an ordered porous alumina nanotemplate, and the pores of various sizes and depths were constructed electrochemically through anodic oxidation. The optimum morphological structure for large area application was constructed by adjusting the applied potential, temperature, time, and electrolyte concentration. SEM investigations showed that hexagonal-close-packed alumina nano-pore arrays were nicely constructed on Si substrate, having smooth wall morphologies and well-defined diameters. It is also reported that one dimensional copper nanopillars can be fabricated using the tunable nanopore sized AAO/Si template, by controlling the copper deposition process. 相似文献
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《Ceramics International》2019,45(10):12727-12733
Alumina fiber was fabricated by an anodic oxidation process from pure aluminum or a chemical dissolution process from porous alumina. In the experiments, porous alumina layer was firstly formed on the surface of pure aluminum by anodic oxidation process in phosphoric acid electrolyte. The alumina fiber was obtained by either further anodic oxidation process or a chemical dissolution process from the porous alumina layer. The thickness of the porous alumina layer, the diameter and wall thickness of the pores in the porous alumina layer, and the length and diameter of the obtained alumina fiber were examined. The formation mechanism of the alumina fiber was discussed. 相似文献
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In the present paper, direct foaming technique and sacrificial template method were used to prepare porous alumino-silicate bonded SiC ceramics from mixtures of silicon carbide, kaolin and calcined alumina. The direct foaming process depends on generating bubbles inside the slurry of SiC mixtures through a reaction between CaC2 and Al powder in presence of H2O to form C2H2 and H2 gases in two steps of the reaction. In the sacrificial template method, the pores were created in the prepared SiC specimens after burning out the used sacrificial template, corn and potato starch. Some fired specimens were selected to study the effect of their composition and preparation conditions on their oxidation resistivity, compressive strength and thermal shock resistivity. Based on purity and homogenous microstructure, the present study offers SiC specimens with good oxidation resistance where they exhibit (0.1 to 2 mg/cm2) increase in mass after oxidation in air at a temperature of 1100 ̊C for 65 h, despite their high open porosity values. The present SiC specimens have high thermal shock resistivity. However, the foamed specimens showed better resistivity than those prepared by the sacrificial template method. Using the extruder for shaping the latter specimens improves their resistivity to thermal shock. The compressive strength of both groups of specimens is affected by their composition and preparation conditions. 相似文献
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The light emitting properties of porous silicon formed by electrochemical etching process and the potential distribution at the Si/electrolyte (HF) interface have been studied. The results show that porous silicon photoluminescent properties are sensitive to the formation conditions. During anodic oxidation, selective dissolution of silicon that leads to porous structure formation has significant influence on the interface capacitance characteristics. 相似文献