Hybrid Gas Atomization for Powder Production

Fritsching, Udo; Uhlenwinkel, Volker

doi:10.5772/35807

Cited by 19 publications

(18 citation statements)

References 18 publications

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“…The first kind is called the confined or close-coupled atomizer, and the second kind is called the free-fall atomizer. Both concepts are illustrated in Figure 2 [3].…”

Section: The Gas Atomization Processmentioning

confidence: 99%

“…By controlled scanning and oscillating of the gas cooling jets, running atomization process can be adjusted at any moment, and therefore desired powder size and distribution can be better achieved. Close-coupled atomizer offers process adjustment by modification of the cooling gas pressure only that allows much lower process modification versatility in comparison to free-fall atomizer [3][4][5].…”

Section: The Gas Atomization Processmentioning

confidence: 99%

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Powder Application in Additive Manufacturing of Metallic Parts

Džugan¹,

Nový²

2017

Powder Metallurgy - Fundamentals and Case Studies

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This chapter is going to give up-to-date overview of development in the field of additive manufacturing (AM) of metallic components. There will be briefly mentioned input materials and specific requirement for the input materials (powders and wires). General technology process overview will be presented here, and selective laser melting (SLM) technology and beam melting technologies will be described. Advantages of 3D printing technology will be explained in terms of special designs; special properties and generally multifunctional components of production possibilities will be shown. Postprinting procedures leading to improvement of mechanical properties of printed components like thermal or thermomechanical treatment will also be mentioned here.

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“…The first kind is called the confined or close-coupled atomizer, and the second kind is called the free-fall atomizer. Both concepts are illustrated in Figure 2 [3].…”

Section: The Gas Atomization Processmentioning

confidence: 99%

Section: The Gas Atomization Processmentioning

confidence: 99%

Powder Application in Additive Manufacturing of Metallic Parts

Džugan¹,

Nový²

2017

Powder Metallurgy - Fundamentals and Case Studies

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“…Several nozzle geometries and designs for atomization of liquids and melting metals have been investigated showing the impacts of the nozzle geometry and dispersion gas conditions on the droplet/ particle characteristics. [23][24][25][26][27] Additionally, it is shown that an increase in precursor-dispersion gas feed ratio results in larger flames and higher particle residence time inside the hightemperature region of the flame, which in turn results in larger nanoparticles. [11,[28][29][30] It is also found that increasing precursor molar concentration leads to an augmented liquid viscosity, thus influencing the atomization quality and changing the flame shape.…”

Section: Introductionmentioning

confidence: 99%

Impact of co‐flow on the spray flame behaviour applied to nanoparticle synthesis

et al. 2018

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Flame spray pyrolysis (FSP) is an established process to synthesize nanoparticles of various metals and metal oxides. Applying open or enclosed configurations of the FSP reactor is an efficient tool to control the fuel‐oxidizer ratio in the reaction zone and, thus, the temperature distribution and the particle formation and growth process. In the present work, geometrical setups representing an open and an enclosed flame reactor are compared and their influence on the temperature, velocity, and particle characteristics is investigated. In addition, several distinct kinetic mechanisms for the combustion reactions are evaluated and their effects on the local reactor temperature and gas composition distribution are analyzed. An Eulerian‐Lagrangian approach is adopted to describe the multiphase turbulent gas‐droplet flow and a monodisperse approach based on the population balance equation (PBE) model is implemented to predict the particle formation and evolution. From the open reactor results, the air entrainment mass flow rate of gas into the flame is calculated. Several numerical experiments are performed with the enclosed setup. Supplying an appropriate co‐flow rate into the enclosed reactor results in similar flame behaviour as found for the open reactor configuration. By reducing the co‐flow gas, strong recirculation zones and particle deposition on the enclosure walls are observed. In this situation, the local temperature increases considerably, resulting in larger primary nanoparticle diameters.

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“…They are already used in diverse processes such as fuel injection in combustion engines or turbines, as well as melt atomization [11][12][13]. Hybrid atomization concepts are used for several applications especially in powder production [14,15]. Various nozzle geometries and configurations for liquid atomization have been investigated in the past (see e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Based on existing concepts of hybrid atomizers a novel design of flame spray pyrolysis nozzle for an industrial production of synthesis of nanoparticles is suggested [13,15,17,18]. This work is focused on the application of the new nozzle system for nonburning (cold) spray conditions by specifically modifying the dispersion gas flow field to overcome back splashing of the liquid droplets by variation of the dispersion gas outlets.…”

Section: Introductionmentioning

confidence: 99%

Investigation of atomization concepts for large‐scale flame spray pyrolysis (FSP)

Meierhofer

Hodapp

Achelis

et al. 2014

Materialwissenschaft Werkst

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Flame spray pyrolysis (FSP) is a versatile process for the production of inorganic nanoparticles featuring the advantage that the reagents are directly dissolved in the liquid fuel that is atomized to form the burning flame. A majority of previous studies on flame spray pyrolysis is focused on the formation and growth processes of the nanoparticles but neglect the preceding step of precursor atomization and spray formation. In this work an atomization concept for large‐scale nanoparticle production by flame spray pyrolysis is presented. A pressure swirl nozzle is applied for creating a liquid hollow cone, and in a second step, different dispersion gas nozzles are utilized to enhance the atomization of the liquid phase and to influence the spray cone formation and geometry. The relevant parameters influencing the atomization process (dispersion gas feed rate, liquid feed rate) are investigated (for air, water) in non‐burning (cold) spray conditions in order to access the utilization of the different atomizer concepts for the flame spray pyrolysis‐process. Measurements are conducted by applying high speed camera imaging (HSC), particle image velocimetry (PIV) and laser diffraction spectroscopy (LDS). Computational fluid dynamics (CFD) revealed further insight into the gas entrainment and the trajectory of droplets within the spray. Results show that the liquid volume flow rate (and thus the productivity of the process) may be increased significantly while still maintaining an appropriate droplet size compared to the conventional atomization process conditions in flame spray pyrolysis reactors.

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Hybrid Gas Atomization for Powder Production

Cited by 19 publications

References 18 publications

Powder Application in Additive Manufacturing of Metallic Parts

Powder Application in Additive Manufacturing of Metallic Parts

Impact of co‐flow on the spray flame behaviour applied to nanoparticle synthesis

Investigation of atomization concepts for large‐scale flame spray pyrolysis (FSP)

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