Analyses about the influence of the natural oxide layer of aluminium on the brazeability in a shielding gas furnace

Zähr, Julia; Ullrich, H.‐J.; Oswald, Steffen; Türpe, M.; Füssel, Uwe

doi:10.1007/s40194-013-0031-9

Cited by 7 publications

(7 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The amorphous interphase, possibly sourced from the naturally formed oxide layer on Al foil, tightly bonds the Al substrate and the Nb coating. [ 34,35 ] The structure model of the Al‐Nb foil is depicted in Figure 1e. To further understand the structure, we used Auger electron spectroscopy (AES) and electron energy loss spectroscopy (EELS).…”

Section: Resultsmentioning

confidence: 99%

Anode/Cathode Dual‐Purpose Aluminum Current Collectors for Aqueous Zinc‐Ion Batteries

Zhu

Xiong

Yang

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

Rechargeable aqueous zinc (Zn)‐ion batteries (RAZIBs), which use non‐flammable aqueous electrolytes and low‐cost electrode materials, show great potential to boost the development of safe, cost‐effective, and highly efficient energy storage systems. The adoption of lightweight and inexpensive aluminum (Al) as current collectors seems to be a good vision, but Al exhibits an easily‐corroded nature and a high impedance in aqueous electrolytes, making it a challenge to realize the utilization of Al current collector in RAZIBs. In this study, through the direct current magnetron sputtering, niobium (Nb) coated Al (Al‐Nb) foils are prepared, which shows superior corrosion‐resistance in an aqueous solution, while maintaining a satisfying electronic conductivity. Moreover, the Al‐Nb foils can be adopted to both anode and cathode current collectors while exhibiting high coulombic efficiency and good cycling stability even when they are tested under a condition that can meet the real‐world application demands, e.g., the Zn||Al‐Nb half‐cell shows an average coulombic efficiency of 99.17% in 320 cycles under a current density of 25 mA cm−2 and a galvanizing capacity of 6.25 mAh cm−2. The superior performance of the modified Al current collectors may mark a significant step toward the development of high‐energy‐density aqueous batteries.

show abstract

Section: Resultsmentioning

confidence: 99%

Anode/Cathode Dual‐Purpose Aluminum Current Collectors for Aqueous Zinc‐Ion Batteries

Zhu

Xiong

Yang

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…8 These oxide layers may have a negative effect regarding the production and processing of the metals, for example, by affecting solderability. 9 In some cases, even a small oxide layer consisting of only a few monolayers of oxygen may inhibit the soldering of certain surfaces completely. Adding small amounts of silane into the processing atmosphere ("silane doping") can decrease the oxygen activity inside those atmospheres way below 10 −11 mbar�levels otherwise only found in an extremely high vacuum (XHV) in extraterrestrial space.…”

Section: Introductionmentioning

confidence: 99%

“…Metal surfaces exposed to oxygen during processing in air, even to inert gases, usually form an oxide layer . These oxide layers may have a negative effect regarding the production and processing of the metals, for example, by affecting solderability . In some cases, even a small oxide layer consisting of only a few monolayers of oxygen may inhibit the soldering of certain surfaces completely.…”

Section: Introductionmentioning

confidence: 99%

Gas Phase Reaction of Silane with Water at Different Temperatures and Supported by Plasma

et al. 2023

View full text Add to dashboard Cite

The interaction of silane and water is discussed controversially in literature: some authors suggest monosilane and water react kinetically and sufficiently fast enough to remove water, while others state the reaction occurs only at elevated temperatures. This question is of technological interest for the removal of unavoidable water residues in Ar gases. Thermodynamic calculations show that virtually complete removal of water is expected with superstoichiometric silane addition. However, mass spectrometric and infrared spectroscopic experiments give evidence that the addition of monosilane to such an Ar gas at room temperature is unable to remove residual water, which disagrees with some current hypotheses in the literature. This holds even for very high SiH4 concentrations up to 2 vol.-%. Silane reacts with water above temperatures of 555 °C, initiated by the thermal decomposition of silane. A cold dielectric barrier discharge-plasma used for silane and water dissociation enhances reactivity similar to elevated temperatures. Fourier-transformed infrared spectroscopy points toward silanol generation at temperatures between 400 and 550 °C, while quadrupole mass spectrometry indicates the creation of SiOH+, SiHOH+, SiH2OH+, and SiH3OH+. Cold plasmas generate smaller amounts of SiOH+, SiHOH+, and SiH2OH+ compared to elevated temperatures. Reaction products are hydrogen and nanoscaled particles of non-stoichiometric silicon oxides. The silicon-oxide particles produced differ in elemental composition and shape depending on the prevailing water content during decomposition: SiO x generated with residual water appears with relatively smooth surfaces, while the addition of water supports the formation of significantly rougher particle surfaces. Higher initial water contents correlate with higher oxygen contents of the particles.

show abstract

“…17,18 Regarding the machining of macroscale workpieces, the amount of residual oxygen in a process or sheath gas needs to be taken into account when processing materials with a high affinity for oxygen, for example, in metallurgical processes. 19,20 However, all the aforementioned procedures rely on the control of the liquid phase, the addition of hydrogen, manufacturing with decreased process pressure (hence a vacuum), or chemical surface modifications. For the production of oxide-free nanoparticles at ambient pressure, it becomes evident that a strong demand for oxygen-free gases is apparent if a vacuum process is neither intended nor suitable or applicable.…”

Section: Introductionmentioning

confidence: 99%

Creation of Gases with Interplanetary Oxygen Concentration at Atmospheric Pressure by Nanoparticle Aerosol Scavengers: Implications for Metal Processing from nm to mm Range

Olszok

Bierwirth

Weber

2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

A gas purification setup (GPS) is presented that is capable of producing ultrapure inert gases, such as nitrogen, at ambient pressure with residual oxygen concentrations of 10–13 ppm and below. The GPS relies on the interaction of metallic aerosol nanoparticles that capture residual oxygen, resulting in metal oxide particle formation. The finally reached residual oxygen level can be illustrated by the 6.8 billion years needed for the creation of one monolayer of oxygen on a substrate. Consequently, the processing of oxygen-affine materials of any size may be shifted from vacuum processes toward machining steps at atmospheric pressure, maintaining an oxygen-free environment in the future. As an outlook, the presented work includes measurements of the electron work function of nanoparticles under purified (10–13 ppm-level) and unpurified process gas (100 ppm-level), pointing at the strong influence of residual oxygen on nanostructured materials with reference to copper nanoparticles. Future syntheses and applications of nanoscaled structures will be inspired by the opportunity to work with true inert gases at ambient pressure, which has been inaccessible so far.

show abstract

Analyses about the influence of the natural oxide layer of aluminium on the brazeability in a shielding gas furnace

Cited by 7 publications

References 8 publications

Anode/Cathode Dual‐Purpose Aluminum Current Collectors for Aqueous Zinc‐Ion Batteries

Anode/Cathode Dual‐Purpose Aluminum Current Collectors for Aqueous Zinc‐Ion Batteries

Gas Phase Reaction of Silane with Water at Different Temperatures and Supported by Plasma

Creation of Gases with Interplanetary Oxygen Concentration at Atmospheric Pressure by Nanoparticle Aerosol Scavengers: Implications for Metal Processing from nm to mm Range

Contact Info

Product

Resources

About