Powder Metallurgical Production of Innovative High-Temperature Materials

Clemens, Helmut; Mayer, Svea; Heilmaier, Martin

doi:10.1007/s00501-018-0704-1

Berg Huettenmaenn Monatsh

2018

DOI: 10.1007/s00501-018-0704-1

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Powder Metallurgical Production of Innovative High-Temperature Materials

Helmut Clemens

Svea Mayer

Martin Heilmaier

Abstract: Powder metallurgical production of structural parts made of innovative materials such as intermetallic titanium aluminides and refractory metal silicides offer a variety of applications in advanced aero-engines and automotive combustion engines. For the production of high grade alloy powders and their further processing several methods have been developed to industrial scale.

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Cited by 2 publications

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Pressing and Sintering of Titanium Aluminide Powder after Ball Milling in Silane-Doped Atmosphere

Behrens,

Brunotte,

Peddinghaus

et al. 2023

JMMP

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Due to the high specific surface area of titanium aluminide powders, significant and unavoidable surface oxidation takes place during processing. The resulting oxides disrupt the conventional powder metallurgical process route (pressing and sintering) by reducing the green strength and sintered properties. Oxide-free particle surfaces offer the potential to significantly increase particle bond strength and enable the processing of difficult-to-press material powders. In this work, the effect of milling titanium aluminide powder in a silane-doped atmosphere on the component properties after pressing and the subsequent sintering was investigated. Ball milling was used to break up the oxide layers and create bare metal surfaces on the particles. With the help of silane-doped inert gas, the oxygen partial pressure was greatly reduced during processing. It was investigated whether oxide-free surfaces could be produced and maintained by milling in silane-doped atmospheres. Furthermore, the resulting material properties after pressing and sintering were analysed using density measurements, hardness tests, EDX measurements, and micrographs. It was concluded that ball milling in a silane-doped atmosphere produces and maintains oxide-free particle surfaces. These oxide-free surfaces and smaller particle sizes improve the component properties after pressing and sintering.

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Pressing and Sintering of Titanium Aluminide Powder after Ball Milling in Silane-Doped Atmosphere

Behrens,

Brunotte,

Peddinghaus

et al. 2023

JMMP

View full text Add to dashboard Cite

show abstract

Feedstock Development for Material Extrusion-Based Printing of Ti6Al4V Parts

et al. 2022

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In this work, a holistic approach for the fabrication of dense Ti6Al4V parts via material extrusion methods (MEX), such as fused filament fabrication (FFF) or fused feedstock deposition (FFD), will be presented. With respect to the requirements of the printing process, a comprehensive investigation of the feedstock development will be described. This covers mainly the amount ratio variation of the main binder components LDPE (low-density polyethylene), HDPE (high-density polyethylene), and wax, characterized by shear and oscillation rheology. Solid content of 60 vol% allowed the 3D printing of even more complex small parts in a reproducible manner. In some cases, the pellet-based FFD seems to be superior to the established FFF. After sintering, a density of 96.6% of theory could be achieved, an additional hot isostatic pressing delivered density values better than 99% of theory. The requirements (mechanical properties, carbon, and oxygen content) for the usage of medical implants (following ASTM F2885-17) were partially fulfilled or shortly missed.

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Powder Metallurgical Production of Innovative High-Temperature Materials

Cited by 2 publications

References 23 publications

Pressing and Sintering of Titanium Aluminide Powder after Ball Milling in Silane-Doped Atmosphere

Pressing and Sintering of Titanium Aluminide Powder after Ball Milling in Silane-Doped Atmosphere

Feedstock Development for Material Extrusion-Based Printing of Ti6Al4V Parts

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