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Last update 08 May 2025

Heraeus Precious Metals GmbH & Co. KG (New)

Subsidiary Company|2011|Germany|

www.heraeus-precious-metals.com

Subsidiary Company|2011|Germany|

www.heraeus-precious-metals.com

Last update 08 May 2025

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Translational Medicine

Overview

100 Clinical Results associated with Heraeus Precious Metals GmbH & Co. KG (New)

0 Patents (Medical) associated with Heraeus Precious Metals GmbH & Co. KG (New)

Literatures (Medical) associated with Heraeus Precious Metals GmbH & Co. KG (New)

01 May 2021·Materials Science and Engineering: A

Connecting structural defects to tensile failure in a 3D-printed fully-amorphous bulk metallic glass

Author: Jianye Shi ; James P. Best ; Songyun Ma ; Moritz Stolpe ; Bernd Markert ; Shuai Wei

Selective laser melting (SLM) is a promising powder bed based additive manufacturing technique for the near-net-shape production of large-scale bulk metallic glasses (i.e. 3D-printed BMGs).Initial defects such as pores inherent to the SLM process are regarded as key factors for the mech. integrity of BMGs.Here the structural defects in the form of pores are controlled in the SLM-processing of large-scale and fully-amorphous Zr-based BMGs.Their effects on the tensile fracture behaviors are revealed by exptl. and computational studies.Under uniaxial tension, 3D-printed BMGs fracture in a brittle mode with almost zero macroscopic plasticity.The ultimate tensile strength (UTS) exhibits a rapid linear decrease with increasing porosity, while the Young's modulus is found to be insensitive in the low-porosity ( < 2%) regime but decreases quickly in the high-porosity regime.Finite element (FE) simulations show different deformation mechanisms for pore-free and pore-containing BMGs.The former fractures with abundant homogeneously distributed shear bands initiated from material inherent weak points, while the latter experiences firstly plastic deformation around some pores with shear transformation zones (STZs).These STZs connect with each other as the load increases, forming a small number of highly localized shear bands, which develop into the final fracture surface.The orientation of the fracture surface in 3D-printed BMGs tends to show a larger angle than that of most as-cast Zr-based BMGs under tension (e.g. 50^o) and is predominantly affected by pore structures.The exptl. and computational results imply that the printing defects play a dominant role in shear band formation and corresponding mech. properties for 3D-printed BMGs.

01 Apr 2020·Materials Characterization

3D pore structure characterization and hardness in a powder bed fusion-processed fully amorphous Zr-based bulk metallic glass

Author: Bernd Markert ; Jianye Shi ; James P. Best ; Songyun Ma ; Moritz Stolpe ; Shimaalsadat Mostafavi ; Sandra Korte-Kerzel ; Agnes Beckmann ; Shuai Wei

Recently, fabrication of bulk metallic glasses (BMGs) components with complex shapes has been realized using laser powder bed fusion (PBF).Initial defects such as porosity inherent to the PBF process can significantly degrade the mech. integrity of the BMGs components.In spite of intensive studies on pore structures in 3D-printed crystalline alloys, pore structures in 3D-printed fully amorphous BMGs have not been characterized due to the difficulties in achieving large-scale fully amorphous structures.In the present work, the pore characteristics of PBF-processed fully amorphous Zr-based BMGs were systematically studied.The printed amorphous parts can reach a total volumetric porosity as small as 0.45%.Furthermore, correlations were found between porosity, pore size and morphol.Finally, hardness tests at various loads revealed that while the intrinsic properties were constant irresp. of laser processing, the overall mech. properties of the PBF-processed BMGs samples are dominated by pore characteristics.While the densest printed BMG sample had a comparable macroscale hardness to the as-cast material, an increase in porosity of ∼8% led to a decrease in HV5 hardness of ∼17%.The presented results provide a detailed anal. of pore characteristics, and their impact on mech. properties of PBF-processed BMGs, for further exptl. and computational studies of structure-property relationships in this materials class.

09 Jan 2020·Journal of The Electrochemical Society

Towards a Harmonized Accelerated Stress Test Protocol for Fuel Starvation Induced Cell Reversal Events in PEM Fuel Cells: The Effect of Pulse Duration

Author: Hasche, Frederic ; Maric, Robert ; Strasser, Peter ; Gebauer, Christian ; Nesselberger, Markus

Global fuel starvation is an undesired event during fuel cell operation that results in serious degradations at the anode catalyst layer caused by the concomitant reversal of the cell potentials. Several groups have therefore intensified their research efforts towards the implementation of suitable diagnostic tools and accelerated stress test (AST) protocols that mimic cell reversal events. However, the current number of different test protocols requires consolidation and harmonization to define durability targets towards cell reversal tolerance and to benchmark newly developed materials. To create a basis for harmonization, this study examines the difference between pulsed and quasi-continuous AST protocols at the catalyst-coated membrane level. Utilizing a single-cell setup combined with an on-line mass spectrometer, a 2.5-fold increase in the carbon corrosion rates were found for short-pulsed compared to long-lasting cell reversal events. The enhanced corrosion was associated with a 2.2-fold higher loss of electrochemically active surface area and a 15% higher reduction in anode catalyst layer thickness. By contrast, the overall cell performance decreased additionally by 40–50 mV for samples under long-lasting cell reversal events. The decay is mainly driven by an increased ohmic resistance, presumably originating from a more pronounced surface oxide formation on the carbon support.

100 Deals associated with Heraeus Precious Metals GmbH & Co. KG (New)

100 Translational Medicine associated with Heraeus Precious Metals GmbH & Co. KG (New)

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Heraeus Precious Metals GmbH & Co. KG (New)

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