Personne

Lorenz Hagelüken

Cette personne n’est plus à l’EPFL

Publications associées (11)

Tomographic microscopy of functionally graded polymer-derived SiCN ceramics with tunable gradients

Polymer-derived ceramics (PDCs) are a very attractive class of materials due to their excellent properties such as resistance to high temperatures and harsh environments, adjustability of mechanical and functional behavior, and compatibility with a broad r ...

London2024

Tomographic Volumetric Additive Manufacturing of Silicon Oxycarbide Ceramics

Jürgen Brugger, Christophe Moser, Paul Delrot, Jorge Andres Madrid Wolff, Max Kollep, Damien Claude-Marie Loterie, Lorenz Hagelüken, Georgia Konstantinou, Antoine Vincent Boniface

Ceramics are highly technical materials with properties of interest for multiple industries. Precisely because of their high chemical, thermal, and mechanical resistance, ceramics are difficult to mold into complex shapes. A possibility to make convoluted ...

2022

Multiscale microshaping of functionally graded polymer-derived SiCN ceramics

Lorenz Hagelüken

Polymer-derived ceramics (PDCs) exhibit excellent properties and are compatible with many shaping techniques due to the liquid character of the preceramic polymers (PCPs). Furthermore, their properties are adjustable by modifying the precursor composition ...

EPFL2022

Multiscale 2D/3D microshaping of property-contrast polymer-derived SiCN

Jürgen Brugger, Lorenz Hagelüken

Polymer-derived ceramics are a unique class of materials known for their outstanding properties and versatile applicability. The liquid nature of the precursors allows easy addition of fillers in order to alter the resulting ceramics’ properties. We use a ...

2022

Experimental Analysis of Ductile Cutting Regime in Face Milling of Sintered Silicon Carbide

Lorenz Hagelüken

In this study, sintered silicon carbide is machined on a high-precision milling machine with a high-speed spindle, closed-loop linear drives and friction-free micro gap hydrostatics. A series of experiments was undertaken varying the relevant process param ...

2022

Freeform Microstructuring of Cast Polymer-Derived Ceramics by Sacrificial Direct Laser Writing

Jürgen Brugger, Lorenz Hagelüken

Polymer-derived ceramics are known for their resistance to high temperatures and harsh environments as well as property tunability and compatibility with various shaping techniques. We demonstrate here a new hierarchical micro-manufacturing process combini ...

2021

Electrical Conductivity Tuning of Polysilazane-Derived Silicon Carbonitride Ceramics

Lorenz Hagelüken

Polymer-derived ceramics (PDCs) are a promising alternative to powder-sintered ceramics because starting from liquid precursors allows compositional modification by adding functional fillers and shaping with high precision using microfluidics. Here, we pre ...

2020

Cracks, porosity and microstructure of Ti modified polymer-derived SiOC revealed by absorption-, XRD- and XRF-contrast 2D and 3D imaging

Jürgen Brugger, Helena Van Swygenhoven, Nicola Casati, Lorenz Hagelüken

Morphology, phase composition, cracks and porosity are investigated in monolithic Ti modified SiOC polymer-derived ceramics pyrolyzed at 1000°C and 1400°C using synchrotron X-ray full field absorption- contrast tomographic microscopy and scanning XRF- and ...

2020

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In an implantable electrode, such as a pacemaker electrode, fibrotic tissue formation due to a foreign body reaction is an important challenge affecting the efficiency to transmit the electrical signal of the device. The chemical inertness, biocompatibilit ...

2020

Additive micro-manufacturing of crack-free PDCs by two-photon polymerization of a single, low-shrinkage preceramic resin

Jürgen Brugger, Demetri Psaltis, Christophe Moser, Helena Van Swygenhoven, Eirini Kakkava, Lorenz Hagelüken, Georgia Konstantinou, Nikolaos Nianias, Jieping Wang

Additive manufacturing (AM) methods are being integrated in ceramics fabrication either as the main manufacturing tool or for auxiliary purposes. By using polymers, powders and preceramic formulated materials, AM techniques are pushing towards higher resol ...

2020

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