Details
| Original language | English |
|---|---|
| Article number | 8292 |
| Journal | MATERIALS |
| Volume | 15 |
| Issue number | 23 |
| Publication status | Published - 22 Nov 2022 |
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.
Keywords
- aluminum, local XHV-atmosphere, oxide layer, plasma brazing, plasma spectroscopy
ASJC Scopus subject areas
- Materials Science(all)
- Physics and Astronomy(all)
- Condensed Matter Physics
Sustainable Development Goals
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In: MATERIALS, Vol. 15, No. 23, 8292, 22.11.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Investigations into Flux-Free Plasma Brazing of Aluminum in a Local XHV-Atmosphere
AU - Klett, Jan
AU - Bongartz, Benedict
AU - Viebranz, Vincent Fabian
AU - Kramer, David
AU - Hao, Chentong
AU - Maier, Hans Jürgen
AU - Hassel, Thomas
N1 - Funding Information: The publication of this article was supported by the TIB Open Access Fund of the Leibniz Universität Hannover and Technische Informationsbibliothek (TIB). The authors gratefully acknowledge financial support from DFG. This research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)—Project-ID 394563137—SFB 1368.
PY - 2022/11/22
Y1 - 2022/11/22
N2 - 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.
AB - 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.
KW - aluminum
KW - local XHV-atmosphere
KW - oxide layer
KW - plasma brazing
KW - plasma spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=85143772169&partnerID=8YFLogxK
U2 - 10.3390/ma15238292
DO - 10.3390/ma15238292
M3 - Article
AN - SCOPUS:85143772169
VL - 15
JO - MATERIALS
JF - MATERIALS
SN - 1996-1944
IS - 23
M1 - 8292
ER -