Self-propagation Combustion Behavior with Varying Al/Ni Ratios in Compression-Bonded Ni-sputtered Al Foil Multilayers

Kuk, Seoung Woo; Ryu, Ho Jin; Yu, Jin

doi:10.1007/s11661-014-2485-9

Cited by 9 publications

(4 citation statements)

References 30 publications

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“…This method is often expensive as consulting teams charge companies for their time and assessment. Previous studies highlighted the issues associated with using the TRL scale (Olechowski, 2017;Sarfaraz et al, 2012;Lezama-Nicolás et al, 2018;Britt et al, 2008). One of the reported issues is the subjectivity of the scale.…”

Section: Background On Trl Assessmentsmentioning

confidence: 99%

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Identifying Gaps in Automating the Assessment of Technology Readiness Levels

Faidi

Olechowski

2020

Proc. Des. Soc.: Des. Conf.

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Crucial in the design process, Technology Readiness Levels are a common form of technology maturity assessment. Studies suggest that the TRL scale can be subjective and biased. Automating the assessment can reduce human bias. This paper highlights important challenges of automation by presenting data collected on 15 technologies from the nanotechnology sector. Our findings show that, contrary to claims from the literature, patent data exists for low maturity technologies and may be useful for automation. We also found that there exists unexpected trends in data publications at TRL 2, 3 and 4.

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Section: Background On Trl Assessmentsmentioning

confidence: 99%

“…One of the reported issues is the subjectivity of the scale. Many industry professionals reported that the TRL scale assessment can be biased based on each stakeholder's interest (Olechowski, 2017). For example, R&D may want to spend more time perfecting the technology that they advocate for a lower TRL.…”

Section: Background On Trl Assessmentsmentioning

confidence: 99%

Identifying Gaps in Automating the Assessment of Technology Readiness Levels

Faidi

Olechowski

2020

Proc. Des. Soc.: Des. Conf.

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“…Effective laser micromachining of reactive multilayers is dependent on both pulse duration and laser power/energy parameters. Lasers have been used to deliberately ignite reactive multilayers (for fundamental studies) utilizing pulse durations ranging from continuous wave, , millisecond, − microsecond, − and nanosecond pulses. , Reducing the pulse duration into the femtosecond regime lowers the ablation threshold fluence below the ignition threshold to enable micromachining, although sufficient overdriving beyond the ablation threshold can still lead to ignition in this domain …”

Section: Introductionmentioning

confidence: 99%

Variable Laser Ignition Pathways in Al/Pt Reactive Multilayers across 10 Decades of Pulse Duration

et al. 2021

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Pulsed laser irradiation is used to investigate the local initiation of rapid, self-propagating formation reactions in Al/ Pt multilayers. The single pulse direct laser ignition of these 1.6 μm thick freestanding foils was characterized over 10 decades of pulse duration (10 ms to 150 fs). Finite element, reactive heat transport modeling of the near-threshold conditions has identified three distinct ignition pathways. For milli-to microsecond pulses, ignition occurs following sufficient absorption of laser energy to enable diffusion of Al and Pt between layers such that the heat released from the corresponding exothermic reaction overcomes conductive losses outside the laser-irradiated zone. When pulse duration is decreased into the nanosecond regime, heat is concentrated near the surface such that the Al locally melts, and a portion of the top-most bilayers react initially. The favorable kinetics and additional heat enable ignition. Further reducing pulse duration to hundreds of femtoseconds leads to a third ignition pathway. While much of the energy from these pulses is lost to ablation, the remaining heat beneath the crater can be sufficiently concentrated to drive a transverse self-propagating reaction, wherein the heat released from mixing at each interface occurs under kinetic conditions capable of igniting the subsequent layer.

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“…Over the last several decades, a self-propagating exothermic reaction has been discovered in a variety of nanometer-thick multilayer films, such as Al=Ni, [1][2][3] Ti=Al, 4) Zr=Ni, 5) Ti=Si, 6) and Ni=Si films. 7) This reaction is caused by a reduction in atomic binding energy in compound formation, and is easily induced by an energy pulse like a small spark or flame.…”

Section: Introductionmentioning

confidence: 99%

Effect of thickening outermost layers in Al/Ni multilayer film on thermal resistance of reactively bonded solder joints

Kanetsuki

Kuwahara

Egawa

et al. 2017

Jpn. J. Appl. Phys.

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To reduce the thermal resistance of solder joints obtained by Al/Ni self-propagating exothermic reaction, we focus on the interface between the solder and the reactive Al/Ni multilayer before the reaction. We fabricate an Al/Ni film in which the outermost Al or Ni layer is deposited more thickly. By the laser flash method with response function analysis, the thermal resistance of the bonded specimens was measured in the case of thickening and non-thickening of the outermost layer. It is found that the resistance decreases with the thickness of the outermost layers, particularly the Ni layer. To investigate the influence of the amount of void on the resistance, scanning acoustic tomography (SAT), scanning electron microscope (SEM) observation, and field-emission electron probe micro-analysis (FE-EPMA) were carried out. Differences in the interfacial state between Ni-thickening and Al-thickening specimens are discussed in light of solder wettability, diffusion into the solder, and the type of intermetallic compound at the solder interface. It can be considered that thickening the outermost Ni layer has a great impact on decreasing the number of voids generated at the AlNi–solder interface even in low-pressure bonding, leading to reduction in the thermal resistance of solder joints.

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Self-propagation Combustion Behavior with Varying Al/Ni Ratios in Compression-Bonded Ni-sputtered Al Foil Multilayers

Cited by 9 publications

References 30 publications

Identifying Gaps in Automating the Assessment of Technology Readiness Levels

Identifying Gaps in Automating the Assessment of Technology Readiness Levels

Variable Laser Ignition Pathways in Al/Pt Reactive Multilayers across 10 Decades of Pulse Duration

Effect of thickening outermost layers in Al/Ni multilayer film on thermal resistance of reactively bonded solder joints

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