Please use this identifier to cite or link to this item: doi:10.22028/D291-35182
Title: Influence of Initial Temperature and Convective Heat Loss on the Self-Propagating Reaction in Al/Ni Multilayer Foils
Author(s): Baloochi, Mostafa
Shekhawat, Deepshikha
Riegler, Sascha Sebastian
Matthes, Sebastian
Glaser, Marcus
Schaaf, Peter
Bergmann, Jean Pierre
Gallino, Isabella
Pezoldt, Jörg
Language: English
Title: Materials
Volume: 14
Issue: 24
Publisher/Platform: MDPI
Year of Publication: 2021
Free key words: reactive materials
propagation velocity
self-sustained reaction
self-propagating reaction
transformation imprinted materials
DDC notations: 500 Science
Publikation type: Journal Article
Abstract: A two-dimensional numerical model for self-propagating reactions in Al/Ni multilayer foils was developed. It was used to study thermal properties, convective heat loss, and the effect of initial temperature on the self-propagating reaction in Al/Ni multilayer foils. For model adjustments by experimental results, these Al/Ni multilayer foils were fabricated by the magnetron sputtering technique with a 1:1 atomic ratio. Heat of reaction of the fabricated foils was determined employing Differential Scanning Calorimetry (DSC). Self-propagating reaction was initiated by an electrical spark on the surface of the foils. The movement of the reaction front was recorded with a high speed camera. Activation energy is fitted with these velocity data from the high-speed camera to adjust the numerical model. Calculated reaction front temperature of the self-propagating reaction was compared with the temperature obtained by time-resolved pyrometer measurements. X-ray diffraction results confirmed that all reactants reacted and formed a B2 NiAl phase. Finally, it is predicted that (1) increasing thermal conductivity of the final product increases the reaction front velocity; (2) effect of heat convection losses on reaction characteristics is insignificant, e.g., the foils can maintain their characteristics in water; and (3) with increasing initial temperature of the foils, the reaction front velocity and the reaction temperature increased.
DOI of the first publication: 10.3390/ma14247815
Link to this record: urn:nbn:de:bsz:291--ds-351821
ISSN: 1996-1944
Date of registration: 10-Jan-2022
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Keiner Professur zugeordnet
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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