Details
| Original language | English |
|---|---|
| Article number | 100040 |
| Journal | Advances in Industrial and Manufacturing Engineering |
| Volume | 2 |
| Early online date | 4 Apr 2021 |
| Publication status | Published - May 2021 |
| Externally published | Yes |
Abstract
In laser-based powder bed fusion of metals (PBF-LB/M) the presence of oxygen is known to encourage embrittlement and impair the wetting properties of the substrate and solidified material. Conventionally, inert gases like argon are used to reduce the residual oxygen content within the processing atmosphere. However, especially in terms of reactive materials like titanium the remaining oxygen still causes critical oxidations. In this publication, a new approach for obtaining an oxygen-free processing atmosphere is presented. Thereby the argon shielding gas is doped with reactive monosilane to reduce the residual oxygen content to a range comparable to XHV (Extreme High Vacuum, thermodynamic oxygen activity <10−15). The handling of this new silane-containing atmosphere requires the development of a special manufacturing system. Therefore, this work elucidates the development of an innovative machine system in accordance with the VDI (German Association of Engineers) Guideline 2221. For determination and specification of the underlying requirements, the interaction of the gas mixture with various construction materials and Ti–6Al–4V powder material was investigated in a test chamber. It could be shown that metallic materials and smooth surfaces are favorable for the design while polymers are likely to degrade in silane-containing atmosphere. Further, the design of the gas flow in the build chamber was optimized using flow simulation. In order to avoid the deposition of reaction products in the process zone, a laminar flow should be established, which can be achieved by baffles and honeycomb structures.
Keywords
- Additive manufacturing, Design methodology, Flow simulation, Gas flow, Laser-based powder bed fusion, Monosilane
ASJC Scopus subject areas
- Engineering(all)
- Industrial and Manufacturing Engineering
- Engineering(all)
- Mechanical Engineering
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Engineering (miscellaneous)
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In: Advances in Industrial and Manufacturing Engineering, Vol. 2, 100040, 05.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - PBF-LB/M process under a silane-doped argon atmosphere
T2 - Preliminary studies and development of an innovative machine concept
AU - Emminghaus, Nicole
AU - Fritsch, Sebastian
AU - Büttner, Hannes
AU - August, Jannes
AU - Tegtmeier, Marijan
AU - Huse, Michael
AU - Lammers, Marius
AU - Hoff, Christian
AU - Hermsdorf, Jörg
AU - Kaierle, Stefan
N1 - Funding Information: Funded by the Deutsche Forschungsgemeinschaft (DFG , German Research Foundation) – Project-ID 394563137 – SFB 1368 .
PY - 2021/5
Y1 - 2021/5
N2 - In laser-based powder bed fusion of metals (PBF-LB/M) the presence of oxygen is known to encourage embrittlement and impair the wetting properties of the substrate and solidified material. Conventionally, inert gases like argon are used to reduce the residual oxygen content within the processing atmosphere. However, especially in terms of reactive materials like titanium the remaining oxygen still causes critical oxidations. In this publication, a new approach for obtaining an oxygen-free processing atmosphere is presented. Thereby the argon shielding gas is doped with reactive monosilane to reduce the residual oxygen content to a range comparable to XHV (Extreme High Vacuum, thermodynamic oxygen activity <10−15). The handling of this new silane-containing atmosphere requires the development of a special manufacturing system. Therefore, this work elucidates the development of an innovative machine system in accordance with the VDI (German Association of Engineers) Guideline 2221. For determination and specification of the underlying requirements, the interaction of the gas mixture with various construction materials and Ti–6Al–4V powder material was investigated in a test chamber. It could be shown that metallic materials and smooth surfaces are favorable for the design while polymers are likely to degrade in silane-containing atmosphere. Further, the design of the gas flow in the build chamber was optimized using flow simulation. In order to avoid the deposition of reaction products in the process zone, a laminar flow should be established, which can be achieved by baffles and honeycomb structures.
AB - In laser-based powder bed fusion of metals (PBF-LB/M) the presence of oxygen is known to encourage embrittlement and impair the wetting properties of the substrate and solidified material. Conventionally, inert gases like argon are used to reduce the residual oxygen content within the processing atmosphere. However, especially in terms of reactive materials like titanium the remaining oxygen still causes critical oxidations. In this publication, a new approach for obtaining an oxygen-free processing atmosphere is presented. Thereby the argon shielding gas is doped with reactive monosilane to reduce the residual oxygen content to a range comparable to XHV (Extreme High Vacuum, thermodynamic oxygen activity <10−15). The handling of this new silane-containing atmosphere requires the development of a special manufacturing system. Therefore, this work elucidates the development of an innovative machine system in accordance with the VDI (German Association of Engineers) Guideline 2221. For determination and specification of the underlying requirements, the interaction of the gas mixture with various construction materials and Ti–6Al–4V powder material was investigated in a test chamber. It could be shown that metallic materials and smooth surfaces are favorable for the design while polymers are likely to degrade in silane-containing atmosphere. Further, the design of the gas flow in the build chamber was optimized using flow simulation. In order to avoid the deposition of reaction products in the process zone, a laminar flow should be established, which can be achieved by baffles and honeycomb structures.
KW - Additive manufacturing
KW - Design methodology
KW - Flow simulation
KW - Gas flow
KW - Laser-based powder bed fusion
KW - Monosilane
UR - http://www.scopus.com/inward/record.url?scp=85107649792&partnerID=8YFLogxK
U2 - 10.1016/j.aime.2021.100040
DO - 10.1016/j.aime.2021.100040
M3 - Article
AN - SCOPUS:85107649792
VL - 2
JO - Advances in Industrial and Manufacturing Engineering
JF - Advances in Industrial and Manufacturing Engineering
M1 - 100040
ER -