Preparation and Characterization of Core-Shell Al/Al2O3 Composites with Adjusted Structure through Fast Hydrothermal Oxidation of Aluminum

3rd Annual International Workshop on Materials Science and Engineering

Ambaryan, G.N.^1 ; Vlaskin, M.S.^1 ; Shkolnikov, E.I.^1 ; Zhuk, A.Z.^1

Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13, Moscow

125412, Russia^1

关键词: Additive technology;    Continuous reactors;    Hydrothermal oxidation;    Hydrothermal process;    Hydrothermal reactor;    Metal-ceramic composites;    Partial oxidations;    Structure analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/250/1/012050/pdf
DOI  :  10.1088/1757-899X/250/1/012050

来源: IOP

【 摘 要 】

A method for preparation of core-shell Al/Al2O3composites with adjusted structure was proposed. It was based on two steps: fast hydrothermal partial oxidation of aluminum in continuous reactor and subsequent thermal treatment in muffle furnace to convert aluminum hydroxide to γ-Al2O3. It was shown the possibility to create metal-ceramic composites with adjustable content of metallic core by temperature of hydrothermal process. During experimental study it was established that oxidation degree for aluminum powder with average size of 22 μm was changed from 40 to almost 100 % when temperature in hydrothermal reactor changed from 280 to 350 °C. The reaction time was no more than 10 min. Obtained products were studied by scanning electron microscopy, pore structure analysis and XRD analysis. Prepared core-shell Al/γ-Al2O3composites can be used as catalyst materials as well as for additive technologies.