Influence of Impurities on the Front Velocity of Sputter Deposited Al/CuO Thermite Multilayers

CuO and Al thin films were successively deposited using direct current (reactive) magnetron sputter deposition. A multilayer of five bilayers was deposited on glass, which can be ignited by heating a Ti resistive thin film. The velocity of the reaction front which propagates along the multilayer was...

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Veröffentlicht in:Materials Jg. 14; H. 23; S. 7224
Hauptverfasser: Dulmaa, Altangerel, Depla, Diederik
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Basel MDPI AG 26.11.2021
MDPI
Schlagworte:
Aluminum
Bilayers
Deposition
Direct current
Energy storage
Experiments
Front velocity
Glass substrates
Heat conductivity
High speed cameras
Impurities
Influence
Multilayers
Oxidizing agents
Thin films
Titanium
Vacuum chambers
Velocity
Germany
ISSN:1996-1944, 1996-1944
Online-Zugang:Volltext
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Zusammenfassung:CuO and Al thin films were successively deposited using direct current (reactive) magnetron sputter deposition. A multilayer of five bilayers was deposited on glass, which can be ignited by heating a Ti resistive thin film. The velocity of the reaction front which propagates along the multilayer was optically determined using a high-speed camera. During the deposition of the aluminum layers, air was intentionally leaked into the vacuum chamber to introduce impurities in the film. Depositions at different impurity/metal flux ratios were performed. The front velocity reaches a value of approximately 20 m/s at low flux ratios but drops to approximately 7 m/s at flux ratios between 0.6 and 1. The drop is rather abrupt as the front velocity stays constant above flux ratios larger than 1. This behavior is explained based on the hindrance of the oxygen transport from the oxidizer (CuO) to the fuel (Al).
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma14237224