Herstellung von Nanopartikeln (Synthese): Ansätze und Methoden

Der Vortrag behandelt die Herstellung (Synthese) von Kohlenstoffnanopartikeln (Carbon Nanotubes, Graphen, Carbon Nanohorns) sowie von Metall- und Keramik-Nanopartikeln (mit lösemittelchemischen und Plasma-Verfahren). Die Ziele/Herausforderungen, welche bei der Synthese von Nanopartikeln generell bestehen, werden dargestellt

Plasma spheroidised metals for additive manufacturing

Metal and ceramic powders are the basis for many technical and industrial processes and applications, such as powder metallurgy, thermal spraying, electronics and catalysis. Nevertheless, there is still a need for further developments, because the powdery raw materials eventually determine the properties of final products and may be the cause of the problems in the processing of these: Impurities or corrosion processes at the powder production (e.g. by the grinding processes) can have a disadvantageous effect or the particle shape leads to a greater abrasion or a rough coating texture. At the same time market requirements are changing more and more quickly and frequently. To be able to react to this, manufacturers need flexible, fast solutions for development, production and quality assurance. Thereby, the high melting point of metals such as tungsten or titanium or technical ceramics (tungsten carbide), which are important for hard alloys, is an additional challenge

Titanium (TiO2) coated nano-carbons in an aluminium matrix for weight reduction applications: Poster presented at Euro LightMAT 2013, Magnesium, Aluminium, Titanium. Science and Technology. International Congress on Light Materials, 3-5 September 2013, Bremen

One of the most urgent needs in automotive industry is the reduction of weight. Light cars produce less CO2, use less energy, are easy to brake or accelerate and show a much better driving performance than heavier cars. In the case of electro vehicles, weight reduction is vital to extend the driving range - thus lightweight material is a key for modern mobility. While metal alloys already reached their technical limits, carbon fibre based car parts are still not mass producible today. This situation leads to a gap which can be filled by using carbon nanotubes (CNT) reinforced alloys to provide high-performance alloys for the mobility of tomorrow. By modifying the nano carbon (NC) surface through coating (via CVD- or Sol Gel-procedure) it is possible to further increase the interfacial bonding as well a protecting the NC from detrimental composite manufacturing processing. The metal-oxide coatings applied via this two procedures differ in structure and degree of coating. Although a full coating of the NC has not been reached so far, results in achieved in processing are encouraging. The advantages and disadvantages of both procedures for large scale application are discussed. Fraunhofer IPA has been conducting research and development of metal matrix composites (MMC) with such nano-carbon materials. The outstanding thermal, electrical, and mechanical properties of nano-carbons are applied to a wide range of applications. By varying the manufacturing process it is possible to tailor the physical, thermal or electrical properties of the material. The result is an aluminium alloy exhibiting vastly superior reproducible physical properties (tensile and ultimate strength increased by 100% and 180% respectively, Impact strength over 270%, E module increase of 30% (ductility kept) and increase of 80% in damping ratio) produced by an economically feasible process (up scalable)

Analysis of Outcomes in Ischemic vs Nonischemic Cardiomyopathy in Patients With Atrial Fibrillation A Report From the GARFIELD-AF Registry

IMPORTANCE Congestive heart failure (CHF) is commonly associated with nonvalvular atrial fibrillation (AF), and their combination may affect treatment strategies and outcomes