Assessing the robustness of powder rheology and permeability measurements

2020 ◽  
Vol 35 ◽  
pp. 101203
Author(s):  
L.P. Lefebvre ◽  
J. Whiting ◽  
B. Nijikovsky ◽  
S.E. Brika ◽  
H. Fayazfar ◽  
...  
Keyword(s):  
Powder Rheology

scholarly journals 316L Stainless Steel Powders for Additive Manufacturing: Relationships of Powder Rheology, Size, Size Distribution to Part Properties

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5537
Author(s):  
Robert Groarke ◽  
Cyril Danilenkoff ◽  
Sara Karam ◽  
Eanna McCarthy ◽  
Bastien Michel ◽  
...  
Keyword(s):  
Particle Size ◽  
Stainless Steel ◽  
Additive Manufacturing ◽  
Optical Microscope ◽  
Stainless Steel 316L ◽  
Powder Morphology ◽  
Size And Shape ◽  
Powder Rheology ◽  
Powder Properties ◽  
Particle Size And Shape

Laser-Powder Bed Fusion (L-PBF) of metallic parts is a highly multivariate process. An understanding of powder feedstock properties is critical to ensure part quality. In this paper, a detailed examination of two commercial stainless steel 316L powders produced using the gas atomization process is presented. In particular, the effects of the powder properties (particle size and shape) on the powder rheology were examined. The results presented suggest that the powder properties strongly influence the powder rheology and are important factors in the selection of suitable powder for use in an additive manufacturing (AM) process. Both of the powders exhibited a strong correlation between the particle size and shape parameters and the powder rheology. Optical microscope images of melt pools of parts printed using the powders in an L-PBF machine are presented, which demonstrated further the significance of the powder morphology parameters on resulting part microstructures.

Experimental investigation of cohesive powder rheology

2000 ◽  
Vol 112 (1-2) ◽  
pp. 94-101 ◽  
Author(s):  
James F Klausner ◽  
Dongming Chen ◽  
Renwei Mei
Keyword(s):  
Experimental Investigation ◽  
Powder Rheology ◽  
Cohesive Powder

Wet Mass Consistency Reported by In-Line Drag Force Flow Sensor Compared With Powder Rheology and Shaft Amperage

2019 ◽  
pp. 651-664
Author(s):  
Ajit S. Narang ◽  
Valery Sheverev ◽  
Vadim Stepaniuk ◽  
Sherif I.F. Badawy ◽  
Dilbir Bindra ◽  
...  
Keyword(s):  
Drag Force ◽  
Flow Sensor ◽  
Powder Rheology

Characterization of impregnated particles via powder rheology

2009 ◽  
Vol 196 (2) ◽  
pp. 222-228 ◽  
Author(s):  
Luis F. Madariaga ◽  
Philippe Marchal ◽  
Christophe Castel ◽  
Eric Favre ◽  
Lionel Choplin
Keyword(s):  
Powder Rheology

scholarly journals Materials characterization of advanced fillers for composites engineering applications

2019 ◽  
Vol 8 (1) ◽  
pp. 503-512 ◽  
Author(s):  
Lubomír Lapčík ◽  
Martin Vašina ◽  
Barbora Lapčíková ◽  
David Hui ◽  
Eva Otyepková ◽  
...  
Keyword(s):  
Surface Energy ◽  
Packing Density ◽  
High Surface ◽  
Hollow Spheres ◽  
Particle Surface ◽  
Energy Profiles ◽  
Powder Rheology ◽  
Flow Characterization ◽  
Die Compaction ◽  
Lower Bulk Density

Abstract Four different minerals were investigated; hollow spheres of calcium carbonate, platy mica, needle like wollastonite and glassy perlite and characterized via iGC for surface energy, Freeman powder rheology for flow characterization, cyclic uniaxial die compaction for modulus of elasticity and frequency dependent sound absorption properties. Particle surface energy and particle shape strongly affected the packing density of powder beds. In the case of higher porosity and thus lower bulk density, the powders acoustic absorption was higher in comparison with higher packing density materials. Surface energy profiles and surface energy distributions revealed clear convergence with powder rheology data, where the character of the powder flow at defined consolidation stresses was mirroring either the high cohesion powders properties connected with the high surface energy or powder free flowing characteristics, as reflected in low cohesion of the powder matrix.

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