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Magnetron Sputtered Al-CuO Nanolaminates: Effect of Stoichiometry and Layers Thickness on Energy Release and Burning Rate

Bahrami, Mehdi and Taton, Guillaume and Conédéra, Véronique and Salvagnac, Ludovic and Tenailleau, Christophe and Alphonse, Pierre and Rossi, Carole Magnetron Sputtered Al-CuO Nanolaminates: Effect of Stoichiometry and Layers Thickness on Energy Release and Burning Rate. (2014) Propellants, Explosives, Pyrotechnics, 39 (3). 365-373. ISSN 0721-3115

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Official URL: http://dx.doi.org/10.1002/prep.201300080

Abstract

This paper reports on the reaction characteristic of Al/CuO reactive nanolaminates for different stoichiometries and bilayer thicknesses. Al/CuO nanolaminates are deposited by a DC reactive magnetron sputtering method. Pure Al and Cu targets are used in argon-oxygen gas mixture plasma and an oxygen partial pressure of 0.13 Pa. This process produces low stress multilayered materials, each layer being in the range of 25 nanometers to one micrometer. Their structural, morphological, and chemical properties were characterized by high resolution transmission electron microscopy (HR-TEM), X-ray Diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The heat of reaction and onset temperature were measured using differential scanning calorimetry (DSC). Under stoichiometric conditions, the reactivity quickly increases with the decrease of Al/CuO bilayer thickness. The burning rate is 2 m s−1 for bilayer thickness of 1.5 μm and reaches 80 m s−1 for bilayer thickness of 150 nm. At constant heating rate, the Al/CuO heat of reaction depends on both stoichiometry and bilayer thickness. When the bilayer thickness exceeds 300 nm, the heat of reaction decreases; it seems that only the region near the interface reacts. The best nanolaminate configuration was obtained for Al/CuO bilayer thickness of 150 nm.

Item Type:Article
Additional Information:Thanks to Wiley-VCH Verlag editor. The definitive version is available at http://onlinelibrary.wiley.com/doi/10.1002/prep.201300080/abstract;jsessionid=911386788104C4A0924CAA152BA7D034.f03t04
Audience (journal):International peer-reviewed journal
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Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:18 Jun 2015 13:56

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