S. Dudziak

Laser Zentrum Hannover

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Andreas Ostendorf

Ruhr University Bochum

Stephan Barcikowski

University of Duisburg-Essen

Jürgen Stampfl

TU Wien

H. Haferkamp

Leibniz University Hannover

A. Neumeister

Jena University Hospital

Dietmar Kracht

Laser Zentrum Hannover

Sven Passinger

Coherent (Germany)

Oliver Meier

Berlin School of Economics and Law

Peter M. Vogt

Medizinische Hochschule Hannover

Malte Fließ

Medizinische Hochschule Hannover

Cooperative Institutions

Laser Zentrum Hannover

Medizinische Hochschule Hannover

University of Rostock

Leibniz University Hannover

Austrian Cluster for Tissue Regeneration

University of Duisburg-Essen

Engineering and Physical Sciences Research Council

Creative Commons

Friedrich-Alexander-Universität Erlangen-Nürnberg

Berlin School of Economics and Law

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Functionality of laser-sintered shape memory micro-actuators

Physics Procedia (2010)

S. Dudziak Matthias Gieseke H. Haferkamp Stephan Barcikowski Dietmar Kracht

NiTi shape memory alloys are considered to be difficult to machine. Dimensional accuracy can hardly be met especially in micro-machining. Being a non-contact tool and therefore independent from machining forces, the laser is a promising alternative for manufacturing NiTi micro-parts. This paper presents research results on powder bedbased laser sintering of fine NiTi powders. Structures with a minimum width of approximately 50 μm can be generated without losing the special shape memory properties. The structures "remember" the shape which was set in the laser process. We show that phase transformation temperature can be influenced by process parameters.

Nickel titanium

Selective laser sintering

10.1016/j.phpro.2010.08.088

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Citations (15)

Micro- and Nano-Parts Generated by Laser-Based Solid Freeform Fabrication ☆

Elsevier eBooks (2017)

Andreas Ostendorf A. Neumeister S. Dudziak Sven Passinger Jürgen Stampfl

Stereolithography

Selective laser sintering

Microsystem

10.1016/b978-0-08-101252-9.00020-0

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Citations (4)

Induction of Osteogenic Differentiation of Adipose Derived Stem Cells by Microstructured Nitinol Actuator-Mediated Mechanical Stress

PLoS ONE (2012)

Sarah Strauß S. Dudziak Ronny Hagemann Stephan Barcikowski Malte Fließ

The development of large tissue engineered bone remains a challenge in vitro, therefore the use of hybrid-implants might offer a bridge between tissue engineering and dense metal or ceramic implants. Especially the combination of the pseudoelastic implant material Nitinol (NiTi) with adipose derived stem cells (ASCs) opens new opportunities, as ASCs are able to differentiate osteogenically and therefore enhance osseointegration of implants. Due to limited knowledge about the effects of NiTi-structures manufactured by selective laser melting (SLM) on ASCs the study started with an evaluation of cytocompatibility followed by the investigation of the use of SLM-generated 3-dimensional NiTi-structures preseeded with ASCs as osteoimplant model. In this study we could demonstrate for the first time that osteogenic differentiation of ASCs can be induced by implant-mediated mechanical stimulation without support of osteogenic cell culture media. By use of an innovative implant design and synthesis via SLM-technique we achieved high rates of vital cells, proper osteogenic differentiation and mechanically loadable NiTi-scaffolds could be achieved.

Selective Laser Melting

Nickel titanium

10.1371/journal.pone.0051264

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Citations (27)

Reduced wear and adhesion forces by laser dispersing of ceramics

Physics Procedia (2010)

Christian Nölke S. Claußen S. Dudziak H. Haferkamp Stephan Barcikowski

Laser dispersing offers a great potential to fabricate layers or tracks with tailored properties threat duce abrasive or adhesive wear at the surface of highly stressed components. Different ceramic powder materials like aluminum nitride, aluminum oxide and titanium carbide have been embedded in the surface of tool steels using laser dispersing. The created layers were investigated regarding their elemental composition, dimension, particle distribution and hardness curve.

Titanium carbide

Aluminum Oxide

Particle (ecology)

10.1016/j.phpro.2010.08.165

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Citations (7)

Generation of NiTi-SMA-micro parts using two step laser sintering

S. Dudziak Oliver Meier Henrik Mewes Andreas Ostendorf

Due to special properties like superelasticity and reversible temperature induced deformation shape memory materials offer a unique potential in various fields of application. In medical engineering the shape memory effect, e.g. of NiTi alloys, realized on human body temperature, is in focus. Whilst the application of NiTi based products in cardiology is the most-known one, shape memory alloys can be found nowadays in trauma and reconstructive surgery as well. Surgeons demand for micro grippers to design active micro catheters for cerebric surgery. Furthermore, it is the idea to create NiTi micro actors for the directed stimulation of nerves. Because of its material properties resulting in adverse machinability, there are no machining methods for the production of NiTi micro parts. The generation of micro scale NiTi samples using two step laser sintering could recently be achieved at Laser Zentrum Hannover. As base material, spherical NiTi powders are used. The laser beam source is a 50 W fibre laser. Varying the compression of the powder bed as well as process parameters, micro parts of different density with a minimal width of <100 µm could be generated. Thereby, the special material properties are preserved: The sintered structures show the one way shape memory effect.

Nickel titanium

Machinability

Pseudoelasticity

Selective laser sintering

10.2351/1.5061148

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Citations (1)

Micro- and nano-parts generated by laser-based solid freeform fabrication

Elsevier eBooks (2010)

Andreas Ostendorf A. Neumeister S. Dudziak Sven Passinger Jürgen Stampfl

Stereolithography

Selective laser sintering