Rheological behavior of β-Ti and NiTi powders produced by atomization for SLM production of open porous orthopedic implants

Yablokova, G.; Speirs, M.; Van Humbeeck, J.; Kruth, J.-P.; Schrooten, J.; Cloots, Rudi; Boschini, Frédéric; Lumay, Geoffroy; Luyten, J.

doi:10.1016/j.powtec.2015.05.015

Article (Scientific journals)

Rheological behavior of β-Ti and NiTi powders produced by atomization for SLM production of open porous orthopedic implants

Yablokova, G.; Speirs, M.; Van Humbeeck, J. et al.

2015 • In Powder Technology

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/184302

DOI
10.1016/j.powtec.2015.05.015

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Keywords :

Powder; rheology; orthopedic implants

Abstract :

[en] The growing interest for Selective Laser Melting (SLM) in orthopedic implant manufacturing is accompanied by the introduction of novel Ti alloys, in particular β-Ti for their excellent corrosion resistance as well as favorable combination of high mechanical strength, fatigue resistance and relatively low elastic modulus. As part of the SLM process for producing quality β-Ti parts powder flowability is essential to achieve uniform thickness of powder layers. In this work the flowability of different gas atomized β-Ti, including NiTi, powders has been studied. Their rheological properties were compared to those of commercially available plasma-atomized Ti–6Al–4V powder using a newly developed semi-automatic experimental set-up. Not only the particle size, shape and size distribution of the powders display a large influence on the powder flowability but also particle surface properties such as roughness, chemical composition and the presence of liquid on the surface of the particles. It was found that plasma or gas atomization production techniques for SLM powder have a considerable effect on the particle topography. Among the powders studied regarding SLM applicability only rheological properties of the fine size fraction (25–45 μm) of Ti–45Nb didn't conform to SLM processing requirements. To improve flowability of the Ti–45Nb powder itwas annealed both in air and argon atmosphere at 600 °C during 1 h, resulting in an improved rheological behavior suitable for SLM processing.

Disciplines :

Physics

Author, co-author :

Yablokova, G.

Speirs, M.

Van Humbeeck, J.

Kruth, J.-P.

Schrooten, J.

Cloots, Rudi ; Université de Liège > Département de chimie (sciences) > LCIS - GreenMAT

Boschini, Frédéric ; Université de Liège > Plateforme APTIS

Lumay, Geoffroy ; Université de Liège > Département de physique > Physique expér. de la matière molle et des syst. complexes

Luyten, J.

Language :

English

Title :

Rheological behavior of β-Ti and NiTi powders produced by atomization for SLM production of open porous orthopedic implants

Publication date :

15 May 2015

Journal title :

Powder Technology

ISSN :

0032-5910

eISSN :

1873-328X

Publisher :

Elsevier Science, Lausanne, Switzerland

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 23 July 2015

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