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Self-propagating combustion synthesis via an MSR process: An efficient and simple method to prepare (Ti, Zr, Hf)B2-Al2O3 powder nanocomposites

Opened Access Self-propagating combustion synthesis via an MSR process: An efficient and simple method to prepare (Ti, Zr, Hf)B2-Al2O3 powder nanocomposites

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Autor: Sayagués de Vega, María Jesús
Córdoba Gallego, José Manuel
Gotor Martínez, Francisco José
Avilés Escaño, Miguel Ángel
Departamento: Universidad de Sevilla. Departamento de Química Inorgánica
Fecha: 2014
Publicado en: Powder Technology, 256, 244-250.
Tipo de documento: Artículo
Resumen: The synthesis of (Ti1-xZrx)B2-Al2O3, (Ti1-xHfx)B2-Al2O3 and (Zr1-xHfx)B2-Al2O3 (x=0, 0.5 and 1) powder nanocomposites via a mechanochemical method using TiO2, ZrO2, HfO2, HBO2 and Al as the raw materials was investigated. The formation of the nanocomposites proceeds via a mechanically-induced self-sustaining reaction (MSR) process that involves several simultaneous reactions. The aluminothermic reductions of the TMO2 and HBO2 produce Al2O3 and transition metal and boron elements, which in turn react to yield the diboride phase. The ignition of the complex combustion reaction occurred after a short milling time (15-30min), instantly transforming most of the reactants into products. The sample composition was marked by the stoichiometry of the combustion reaction, and the resulting nanocomposites were analysed using XRD, ED, SEM, TEM and EDX techniques. The X-ray results confirmed the biphasic character of the prepared composite powder (TMB2 and Al2O3 structures); minor amounts of the Z...
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Cita: Sayagués de Vega, M.J., Córdoba Gallego, J.M., Gotor Martínez, F.J. y Avilés Escaño, M.Á. (2014). Self-propagating combustion synthesis via an MSR process: An efficient and simple method to prepare (Ti, Zr, Hf)B2-Al2O3 powder nanocomposites. Powder Technology, 256, 244-250.
Tamaño: 1.165Mb
Formato: PDF

URI: https://hdl.handle.net/11441/74150

DOI: 10.1016/j.powtec.2014.02.031

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