Fluxless brazing of aluminium

Hawksworth, Doug K.

doi:10.1533/9780857096500.3.566

Cited by 12 publications

(4 citation statements)

References 4 publications

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“…The strong affinity of metallic Al for oxygen is well documented. Indeed, the equilibrium constant between Al 2 O 3 and liquid Al is estimated to be of the order 10 71 at 1000 K, wherein Al will oxidise for any oxygen partial pressure above 10 -49 Pa (Kaptay 1991), with Hawksworth (2013) estimating initial layer formation in as little as 100 ps. This compares with an oxygen partial pressure inside the TEMPUS facility estimated by Herlach et al (2017) to be of the order of 10 -2 Pa with a process time of several seconds.…”

Section: Surface Ni-enrichmentmentioning

confidence: 99%

A Model for the Anomalous Velocity-Undercooling Behaviour of Levitated Al-Ni Alloys On-board the International Space Station

Mullis

2021

Microgravity Sci. Technol.

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Al-Ni alloys (for Ni < 45 at.%) show a unique property in that, over at least part of the accessible undercooling range, the recalescence velocity measured in electromagnetically levitated samples is observed to decrease as the undercooling increases. This result has been subject to careful validation, including microgravity experiments utilising the TEMPUS levitation facility on-board the International Space Station (ISS). In these experiments, anomalous growth is observed to coincide with a recalescence morphology comprising multiple circular growth fronts [Herlach et al. Phys. Rev. Mat. 3, 073,402 (2019)], termed “scales”. In this paper we present an analysis of high speed video data from the ISS experiments in which we show that such scale-like growth is consistent with a recalescence front that is initially confined to a thin layer on the surface of the sample. This then nucleates a slower, radial inward growth, which is consistent with microstructures observed in Al-Ni droplets. We show that such surface recalescence would be favoured for samples which were surface enriched in Ni, wherein the recalescence velocity (at fixed nucleation temperature) increases rapidly with Ni-concentration. Moreover, it is shown that the anomalous velocity behaviour can be matched in all compositions studied if the surface enhancement in Ni is a linear function of the nucleation temperature with a gradient of 0.03 at.% K−1. Analysis of historical results from the literature indicates that such surface Ni-enhancement may have been present, but overlooked, in other experiments on Al-rich Al-Ni droplets.

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Section: Surface Ni-enrichmentmentioning

confidence: 99%

A Model for the Anomalous Velocity-Undercooling Behaviour of Levitated Al-Ni Alloys On-board the International Space Station

Mullis

2021

Microgravity Sci. Technol.

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“…(2) In these calculations, Palik's database was used for aluminum [6], while for others the database was extracted from Ref. [7].…”

Section: =2mentioning

confidence: 99%

Supplementary document for New approaches for an aluminum deep-ultraviolet surface plasmon resonance sensor - 4707694.pdf

da Moreira,

Wang,

Blair

et al. 2020

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“…From 1923 Aluminium oxide had usage as adsorbed to remove Pigments, antibiotics, heavy metals, dissolved organics etc. [7,8].…”

Section: Introductionmentioning

confidence: 99%

Applications of aluminum oxide and nano aluminum oxide as adsorbents: review

Hami

Abbas

Eltayef

et al. 2021

sjpas

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Metal oxides are widely used in adsorption technology as adsorbent surfaces because of their efficiency, low cost and unique physical properties. The aim of this review to clarify the role of aluminium oxide and Nano aluminium oxide in removing some chemicals contain that influence on human health such as dyes, antibiotics, and heavy metals. This paper also includes the affective of some adsorption parameters like pH, contact time, removal percentageand temperature. The Adsorption nature, kinetic adsorption models and isotherm models are also reported here.

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Fluxless brazing of aluminium

Cited by 12 publications

References 4 publications

A Model for the Anomalous Velocity-Undercooling Behaviour of Levitated Al-Ni Alloys On-board the International Space Station

A Model for the Anomalous Velocity-Undercooling Behaviour of Levitated Al-Ni Alloys On-board the International Space Station

Supplementary document for New approaches for an aluminum deep-ultraviolet surface plasmon resonance sensor - 4707694.pdf

Applications of aluminum oxide and nano aluminum oxide as adsorbents: review

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