Investigations into Flux-Free Plasma Brazing of Aluminum in a Local XHV-Atmosphere

verfasst von

Jan Klett, Benedict Bongartz, Vincent Fabian Viebranz, David Kramer, Chentong Hao, Hans Jürgen Maier, Thomas Hassel

Abstract

As a lightweight construction material, aluminum plays a key role in weight reduction and, thus, sustainability in the transport industry. The brazing of aluminum and its alloys is impeded by the natural passivating oxide layer, which interferes with the brazing process. The presented study investigates the possibility of using a thermal silane-doped argon plasma to reduce this oxide layer in situ and thus eliminating the need to use hazardous chemical fluxes to enable high-quality brazing. Using plasma spectroscopy and an oxygen partial pressure probe, it was shown that a silane-doped argon plasma could significantly reduce the oxygen concentration around the plasma in a thermal plasma brazing process. Oxygen concentrations below 10⁻¹⁶ vol.-% were achieved. Additionally, metallographic analyses showed that the thickness of an artificially produced Al₂O₃-Layer on top of AlMg1 samples could be substantially reduced by more than 50%. With the oxide layer removed and inhibition of re-oxidation, silane-doped plasma brazing has the potential to become an economically efficient new joining method.

Organisationseinheit(en)

Institut für Werkstoffkunde

Typ

Artikel

Journal

MATERIALS

Band

15

ISSN

1996-1944

Publikationsdatum

22.11.2022

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Werkstoffwissenschaften (insg.), Physik der kondensierten Materie

Ziele für nachhaltige Entwicklung

SDG 12 – Verantwortungsvoller Konsum und Produktion

Elektronische Version(en)

https://doi.org/10.3390/ma15238292 (Zugang: Offen)