A5078772283- Additive Manufacturing Materials and Processes
- Nuclear Physics and Applications
- Additive Manufacturing and 3D Printing Technologies
- Nuclear Materials and Properties
- High Entropy Alloys Studies
- High-pressure geophysics and materials
- High-Temperature Coating Behaviors
- Advanced materials and composites
- Advanced ceramic materials synthesis
- Advancements in Solid Oxide Fuel Cells
- Laser Material Processing Techniques
- Radiation Detection and Scintillator Technologies
- Nuclear reactor physics and engineering
- Atomic and Subatomic Physics Research
- X-ray Diffraction in Crystallography
- Semiconductor materials and devices
- Metal Alloys Wear and Properties
- Metal and Thin Film Mechanics
- Advancements in Battery Materials
- Phase Change Materials Research
- Thermography and Photoacoustic Techniques
- Metallurgical and Alloy Processes
- Ferroelectric and Piezoelectric Materials
- Bone Tissue Engineering Materials
- Coal Combustion and Slurry Processing
Paul Scherrer Institute
2019-2024
University of Life Sciences in Poznań
2022-2024
University of Opole
2024
Institute of Environmental Engineering
2024
Vellore Institute of Technology University
2024
Swiss Federal Laboratories for Materials Science and Technology
2022
ETH Zurich
2022
University of Geneva
2021
University of Bayreuth
2017-2018
Heinz Maier-Leibnitz Zentrum
2017
When Ti-6Al-4V is processed by laser powder bed fusion (L-PBF), acicular martensitic α'-Ti grains are formed within the columnar prior β-Ti grains, resulting in inferior mechanical properties. The application of blended powders L-PBF enables to tailor microstructures and obtain a mixture α' + β phases. In this work, we demonstrate an effective method engineer phase fraction manufactured Ti alloy using consisting 3 wt% Fe particles. By varying parameters, as-built transit from dominated...
Additive manufacturing (AM) methods are being integrated in ceramics fabrication either as the main tool or for auxiliary purposes. By using polymers, powders and preceramic formulated materials, AM techniques pushing towards higher resolution, lower shrinkage shorter building time. Herein, we present of ceramic microstructures (< 200 × μm3) with sub-micrometer resolution based on two-photon polymerization (TPP). 3D structuring a resin by photopolymerization produces so-called green body....
This work describes a high temperature corrosion kinetics study of ∼30 % porous Fe22Cr alloys. The surface area the alloy (∼0.02 m2 g−1) has been determined by tomographic microscopy. weight gain alloys was studied isothermal thermogravimetry in air for 100 h at 700–900 °C. Breakaway oxidation observed after 850 °C (∼100 h) and 900 (∼30 h). lifetime prediction shows investigated can be used >3000 temperatures <700 At ≥700 °C, is limited available chromium reservoir.
The current state of the art steel interconnect coating materials are based on critical raw material - Co-oxide spinels. Replacing spinels with alternative, abundant can reduce dependence materials. Cobalt-free coatings general formula Mn2-xCuFexO4, where x = 0, 0.1, 0.3, were electrophoretically deposited a ferritic stainless-steel support and evaluated. Prior to deposition, powders prepared by soft chemistry process studied in terms crystallographic phase analysis, electrical conductivity,...
Powder bed density, flowability, and laser light absorption of the powder strongly influence quality performance aluminum oxide parts processed by selective sintering melting. By means spray drying, highly dense granules with a good flowability are manufactured. An ultrasonic atomizer co‐current droplet air mixing used to aqueous slurries consisting either bimodal or trimodal distributions oxide. Nano‐iron improves interaction green pulsed laser. The improved is verified an Ulbricht sphere....
Neutron Imaging is ideally suited for applications in cultural heritage even at small reactors with moderate image resolution. However, recently, high resolution imaging being increasingly used advanced studies, especially paleontology. The special contrast hydrogen and between neighboring elements the periodic system allows new that are not accessible X-rays, like organic material enclosed containers made of ceramics or metals, fossilized bones chalk rock ferrous “red” beds, animal hominid...
In laser powder bed fusion (LPBF), complex components are manufactured layer-by-layer via scanning the cross-sections of a 3D CAD model using high intensity laser. Throughout this process, material is exposed to temperature profiles that significantly differ from conventional manufacturing methods, and result in development unique inhomogeneous microstructure levels residual stresses additively fabricated parts. The large gradients rapid cooling rates around moving spot, overall...
The influence of powder bed density on the final and microstructure aluminum oxide parts manufactured by direct selective laser melting has been studied. Iron manganese nanoparticles were used to improve absorption over eighty percent. To achieve such values, flowable doped alumina granules prepared spray drying. Thermal treatment at 1600 °C consecutive mixing with coarse allowed improvement tapped densities, reaching a maximum value 56.4% theoretical density. This led processed densities...
During laser-powder bed fusion (l-PBF) the printed material is subjected to multiple fast heating and cooling cycles when laser interacts with neighboring tracks or layers above. The complex thermal history influences final microstructure macroscopic properties of part. In this work, we demonstrate how high-speed in situ X-ray diffraction transmission mode can be used measure temperature profiles rates a Ti-6Al-4V single-track wall. remelting top layer, exceeding β transus (Tβ ∼ 1252 K)...
Laser powder bed fusion is an emerging industrial technology, especially for metal and polymer applications. However, its implementation oxide ceramics remains challenging due to low thermal shock resistance, weak densification light absorptance in the visible or near-infrared range. In this work, a solution increase reduce cracking during laser processing of alumina parts given. This achieved by use homogeneously dispersed reduced titanium additive (TiO2−x) within spray-dried granules...
Abstract Laser-based Powder Bed Fusion (LPBF) of oxide ceramics enables fabrication objects with complex three-dimensional shapes. However, mechanical properties dense LPBF-manufactured are poor due to large amount structural defects. Here, we perform the operando tomographic microscopy during LPBF a magnetite-modified alumina gain deeper understanding underlying mechanisms. The effect laser energy density on surface roughness, powder denudation zone and porosity formation mechanisms...
Selective Laser Melting (SLM) technology is successfully applied to manufacture aluminum oxide parts. The obtained samples are presented and characterized in terms of density, mechanical properties, structure. starting material a powder composed granules doped with small quantity iron (hematite) as an absorption additive. A green short‐pulsed nanosecond (ns) laser used the experimental in‐house designed built SLM machine. absorption, reflectance, transmittance for wavelength 532 nm evaluated...
This article reports on in situ macroscopic scale imaging of NiO–YSZ (YSZ is yttria-stabilized zirconia) reduction under applied stress – a phase transition taking place solid oxide electrochemical cells reducing atmosphere hydrogen/nitrogen mixture and at operation temperatures up to 1073 K. process critical for the performance lifetime cells. Energy-resolved neutron was observe directly with time spatial resolution. Two different approaches are presented using this technique investigation...
The effect of high-temperature oxidation at 850 °C (10 h, 30 100 h) and 900 on porous (∼30 % porosity) ferritic stainless steel (Fe22Cr) has been investigated using synchrotron tomographic microscopy, which allowed for visualisation, separation quantitative analysis the metallic core, closed pores, open pores oxide scale phase. same regions within samples were before after performed different conditions. Quantitative data provided information changes upon relative volume phases, specific...
Both in industry and research, laser powder bed fusion is increasingly adopted for applications commonly involving metals polymers. However, the application to other materials, specifically oxide ceramics, faces challenges industrial implementations due its unique properties, such as low thermal shock resistance, high brittleness a light absorptance level near-infrared range. This study provides solution increase at wavelength of 1070 nm while also reducing cracking during processing ceramic...
Fast neutron imaging has a great potential as nondestructive technique for testing large objects. The main factor limiting applications of this is detection technology, offering relatively poor spatial resolution images and low efficiency, which results in very long exposure times. Therefore, research on development scintillators fast high importance. A comparison the light output, gamma radiation sensitivity commercially available scintillator screens composed PP/ZnS:Cu PP/ZnS:Ag different...
Recently, two new phenomena linking stress field and reduction rates in anode-supported solid oxide fuel cells (SOFCs) have been demonstrated, so-called accelerated creep during rate enhancement nucleation due to (Frandsen et al. , 2014). These complex are difficult study it is demonstrated here that energy-resolved neutron imaging a feasible technique for combined mechanics–chemical composition studies of SOFC components, including commercially produced ones. Cermet anode supports, which...