Printability of gas atomized Mo-Si-B powders by laser metal deposition

Schmelzer, Janett; Rittinghaus, Silja‐Katharina; Weisheit, Andreas; Stobik, Martin; Paulus, J.; Gruber, Karl; Wessel, E.; Heinze, Christoph; Krüger, Manja

doi:10.1016/j.ijrmhm.2018.08.016

Cited by 35 publications

(18 citation statements)

References 13 publications

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“…For additive manufacturing, the process of Directed Energy Deposition (DED) was chosen. As described in more detail [10], the solid raw materials (Mo > 99.95%, Si > 99.6% and B > 99.4% purity) were molten and superheated in a crucible (inductive heating system) and subsequently atomized into powder/droplets (converging/diverging nozzle, using Ar gas flow), which then was sized to the target fraction + 45/ − 90 µm. DED samples of approximately 10 × 10 x 5 mm 3 in size were built out of the GA Mo-9Si-8B (at.%) powder.…”

Section: Methodsmentioning

confidence: 99%

“…1. The feasibility of printing pre-alloyed Mo-Si-B powder materials via Directed Energy Deposition (DED) process was firstly demonstrated on a near-eutectic Mo-13.5Si-7.5B alloy by Schmelzer et al [10]. For the present article, the alloy composition Mo-9Si-8B, which is known for its excellent property profile, was chosen for processing via AM DED.…”

Section: Introductionmentioning

confidence: 99%

“…As compared to the near-eutectic alloy, the Mo-9Si-8B alloy has a higher melting point of ~ 2360 °C, which might be challenging with regard to AM processing. Hence, in our previous studies [10,13] the feasibility of processing Mo-9Si-8B, Mo-13.5Si-7.5B and Mo-16.5Si-7.5B alloys via AM process was evaluated by microstructure analysis as well as the correlation of AM microstructures to key mechanical properties. As shown in prior studies, the resulting microstructure has an essential influence on the high temperature properties, e.g., the oxidation and creep resistance [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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High Temperature Oxidation Performance of an Additively Manufactured Mo–9Si–8B Alloy

et al. 2021

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As reported in previous studies, the processing of Mo–Si–B alloys using additive manufacturing (AM) techniques, like directed energy deposition (DED) shows a high technical feasibility. The present work investigates the cyclic oxidation performance of an AM DED Mo–9Si–8B alloy. Depending on the temperature (800 °C, 1100 °C, 1300 °C), the oxidation mechanisms vary, which is due to different reactions at the surface of the alloys accompanied with mass changes of samples. These mass changes can be explained on the basis of microstructural investigations. However, compared to a powder metallurgically processed Mo–9Si–8B alloy, the AM-DED alloy shows competitive oxidation performance at potential application temperatures of 1100 °C and 1300 °C, while a catastrophic materials degradation occurs at 800 °C as also observed in other Mo-rich Mo–Si–B alloys.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High Temperature Oxidation Performance of an Additively Manufactured Mo–9Si–8B Alloy

et al. 2021

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“…Unfortunately, these methods have limited powder yield, and are time and energy consuming. Moreover, Mo-Si-B alloys cannot be readily subjected to gas atomization due to their high melting points 9 , hence, there have been limited studies on the fabrication of spherical powders of the Mo-Si-B alloys 28 . Recently, PS is a new technique that can be used for refractory powder fabrication 29 , 30 .…”

Section: Introductionmentioning

confidence: 99%

A novel approach of fabricating monodispersed spherical MoSiBTiC particles for additive manufacturing

Zhou

Guo

Zhou

et al. 2021

Sci Rep

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It is very challenging to fabricate spherical refractory material powders for additive manufacturing (AM) because of their high melting points and complex compositions. In this study, a novel technique, freeze-dry pulsated orifice ejection method (FD-POEM), was developed to fabricate spherical MoSiBTiC particles without a melting process. Elemental nanopowders were dispersed in water to prepare a high-concentration slurry, which was subsequently extruded from an orifice by diaphragm vibration and frozen instantly in liquid nitrogen. After a freeze-drying process, spherical composite particles with arbitrary composition ratios were obtained. The FD-POEM particles had a narrow size range and uniform elemental distribution. Mesh structures were formed within the FD-POEM particles, which was attributed to the sublimation of ice crystals. Furthermore, owing to their spherical morphology, the FD-POEM particles had a low avalanche angle of 42.6°, exhibiting good flowability. Consequently, the combination of FD-POEM and additive manufacturing has great potential for developing complex refractory components used in industrial applications.

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“…2000°C is the lowest in the Mo-Si-B system when meeting the eutectic composition. The printability of near-eutectic Mo-Si-B compositions with DED and the resulting microstructures were presented in [18]. Dense Mo-13.5Si-7.5B samples were consolidated by DED from pre-alloyed gas atomized powders.…”

Section: Introductionmentioning

confidence: 99%

Laser Additive Manufacturing of Intermetallic Alloys for High-Temperature Applications

Rittinghaus¹,

Schmelzer²,

Wilms³

et al. 2021

Preprint

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Intermetallic alloys like e.g. Iron-Aluminides, Titanium-Aluminides or Molybdenum- Silizides are prospective materials for high-temperature applications. For additive manufacturing (AM) intermetallic structural materials are particularly challenging due to their high melting points, oxygen susceptibility and low temperature brittleness. The feasibility of manufacturing intermetallic Mo-Si-B alloys with the laser additive manufacturing process of direct energy deposition (DED) is demonstrated and recent results in characterizing rapidly solidified material with respect to correlations between process, composition and microstructures are presented. The possibility to dope the material with Yttrium oxide (Y2O3) for dispersion is successfully demonstrated. Current challenges, e.g. homogenous distribution of alloying elements and applicability are addressed.

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Printability of gas atomized Mo-Si-B powders by laser metal deposition

Cited by 35 publications

References 13 publications

High Temperature Oxidation Performance of an Additively Manufactured Mo–9Si–8B Alloy

High Temperature Oxidation Performance of an Additively Manufactured Mo–9Si–8B Alloy

A novel approach of fabricating monodispersed spherical MoSiBTiC particles for additive manufacturing

Laser Additive Manufacturing of Intermetallic Alloys for High-Temperature Applications

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