Nano-Al/NiO thermites were successfully prepared as film by electrophoretic deposition (EPD). For the key issue of this EPD, a mixture solvent of ethanol-acetylacetone (1:1 in volume) containing 0.00025 M nitric acid was proved to be a suitable dispersion system for EPD. The kinetics of electrophoretic deposition for both nano-Al and nano-NiO were investigated; the linear relation between deposition weight and deposition time in short time and parabolic relation in prolonged time were observed in both EPDs. The critical transition time between linear deposition kinetics and parabolic deposition kinetics for nano-Al and nano-NiO were 20 and 10 min, respectively. The theoretical calculation of the kinetics of electrophoretic deposition revealed that the equivalence ratio of nano-Al/NiO thermites film would be affected by the behavior of electrophoretic deposition for nano-Al and nano-NiO. The equivalence ratio remained steady when the linear deposition kinetics dominated for both nano-Al and nano-NiO. The equivalence ratio would change with deposition time when deposition kinetics for nano-NiO changed into parabolic kinetics dominated after 10 min. Therefore, the rule was suggested to be suitable for other EPD of bicomposites. We also studied thermodynamic properties of electrophoretic nano-Al/NiO thermites film as well as combustion performance.
Because
of its high energy density, an Al–Co3O4 reactive nanocomposite (Al–Co3O4 RNC)
has attracted vast attention. In this study, Al–Co3O4 RNC was successfully prepared as a coating by
an electrophoretic deposition (EPD) method. An ethanol–acetylacetone
(1:1 in volume) mixture containing 0.25 mM nitric acid was employed
as a suitable dispersion medium for EPD. Differential scanning calorimetry
revealed that the obtained Al–Co3O4 was
a high-energy coating with a maximum heat release of 2638 J·g–1. Moreover, an attempt at assembling an electrophoretic
Al–Co3O4 RNC coating onto an electrothermal
copper bridge was also made. A successful ignition test indicated
that this novel Al–Co3O4 RNC coating
has great potential for application in the microignitor field.
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