Alexander Ariyoshi Zerwas , Flávia Costa da Silva , Roberto Guardani , Lydia Achelis , Udo Fritsching
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引用次数: 0
Abstract
Metal powders for additive manufacturing (AM) are typically produced by atomizing metal melts. In this study, different spray configurations for producing particles for AM are analyzed. Two close-coupled gas-assisted atomizers (CCA) are compared for the atomization of hot working tool steel (AISI H13), namely discrete jets and annular slit nozzles. High-speed image analysis of the oscillations in the liquid spray indicated that the flapping behavior resulted in higher number of off-spec particles (flakes), which were related to the gas-to-melt ratio (GMR). This behavior was observed for both configurations, but flapping oscillations at lower GMR and a super pulsating mode at higher GMR, were identified for the annular slit nozzle. The use of hot atomizer gas resulted in an increase of the fine powder yield suitable for laser powder bed fusion (L-PBF), but at the expense of an increasing satellite particles, which may cause difficulties in powder flow during printing operations.
期刊介绍:
Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests:
Formation and synthesis of particles by precipitation and other methods.
Modification of particles by agglomeration, coating, comminution and attrition.
Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces).
Packing, failure, flow and permeability of assemblies of particles.
Particle-particle interactions and suspension rheology.
Handling and processing operations such as slurry flow, fluidization, pneumatic conveying.
Interactions between particles and their environment, including delivery of particulate products to the body.
Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters.
For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.