Investigation of reactive bimetallic Ni-Al particles as a heat source for microwave-assisted joining

Grohmann, S.; Langhans, G.; Reindl, Anton; Sidarava, Valeryia; Zaeh, Michael F.

doi:10.1016/j.jmatprotec.2020.116637

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…(2) The shape in Figure 5a consists of four peaks, where peak (2) and ( 3) are most pronounced and peak (3) is smaller than peak (2). Figure 5b shows another common form, in which a small initial peak ( 5) is followed by a highly dominant one (6) and an even smaller peak (7) at the end. The characteristic shape in Figure 5c is defined by three peaks with the first one (8) having a smaller maximum than the two following peaks, ( 9) and (10), which are approximately equal in size.…”

Section: Thermal Characterization By Means Of Dscmentioning

confidence: 92%

“…Therefore, the reactions can be classified as solid-solid reactions. Peak (4) and peak (7), respectively, in Figure 5 were observed at approximately 933 K and thus can be attributed to solid-liquid reactions with the melting of aluminum.…”

Section: Thermal Characterization By Means Of Dscmentioning

confidence: 99%

“…Multilayer systems, which consist of alternating layers of the reactants, are already commercially available for the Ni-Al system [6]. Moreover, reactive systems in the form of reactive particles were investigated [7]. In contrast to homogeneous powder mixtures, reactive particles provide the 2 of 13 advantage that each particle can react independently.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Cause-Effect Relationships between the Exothermic Reaction and the Microstructures of Reactive Ni-Al Particles Produced by High Energy Planetary Ball Milling

Bernauer

Grohmann

Angermann

et al. 2021

Metals

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Reactive particles consisting of nickel and aluminum represent an adaptable heat source for joining applications, since each individual particle is capable of undergoing a self-sustaining exothermic reaction. Of particular interest are particles with intrinsic lamellar microstructures, as they provide large contact areas between the reactants nickel and aluminum. In this work, the exothermic reaction as well as the microstructure of such lamellar reactive particles produced by high energy planetary ball milling were investigated. Based on statistically designed experiments regarding the milling parameters, the heat of reaction was examined by means of differential scanning calorimetry (DSC). A statistical model was derived from the results to predict the heat of reaction as a function of the milling parameters used. This model can be applied to adjust the heat of reaction of the reactive particles depending on the thermal properties of the joining partners. The fabricated microstructures were evaluated by means of scanning electron microscopy (SEM). Through the development of a dedicated SEM image evaluation algorithm, a computational quantification of the contact area between nickel and aluminum was enabled for the first time. A weak correlation between the contact area and the heat of reaction could be demonstrated. It is assumed that the quantification of the contact areas can be further improved by a higher number of SEM images per sample. The findings obtained provide an essential contribution to enable reactive particles as a tailored heat source for joining applications.

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Section: Thermal Characterization By Means Of Dscmentioning

confidence: 92%

Section: Thermal Characterization By Means Of Dscmentioning

confidence: 99%