Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

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

Bernd-Arno Behrens
,
Kai Brunotte
ORCID logo ,
Julius Peddinghaus
ORCID logo ,
Jonathan Ursinus
ORCID logo ,
Sebastian Döring
* ORCID logo ,
Wolfgang Maus-Friedrichs
,
René Gustus
,
Maik Szafarska
* ORCID logo
Version 1 : Received: 10 July 2023 / Approved: 11 July 2023 / Online: 12 July 2023 (21:26:27 CEST)

A peer-reviewed article of this Preprint also exists.

Behrens, B.-A.; Brunotte, K.; Peddinghaus, J.; Ursinus, J.; Döring, S.; Maus-Friedrichs, W.; Gustus, R.; Szafarska, M. Pressing and Sintering of Titanium Aluminide Powder after Ball Milling in Silane-Doped Atmosphere. J. Manuf. Mater. Process. 2023, 7, 171. Behrens, B.-A.; Brunotte, K.; Peddinghaus, J.; Ursinus, J.; Döring, S.; Maus-Friedrichs, W.; Gustus, R.; Szafarska, M. Pressing and Sintering of Titanium Aluminide Powder after Ball Milling in Silane-Doped Atmosphere. J. Manuf. Mater. Process. 2023, 7, 171.

Abstract

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 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 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 machining. It was investigated whether oxide-free surfaces could be produced and maintained by milling in silane-doped at-mospheres. Furthermore, the resulting material properties after pressing and sintering were an-alyzed 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.

Keywords

Die pressing and sintering; powder metallurgical process; titanium aluminide powder

Subject

Engineering, Mechanical Engineering

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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