Temperature influence on the triboelectric powder charging during dry coating of polypropylene with nanosilica particles

Düsenberg, Björn; Tischer, Florentin; Valayne, Erika; Schmidt, Jochen; Peukert, Wolfgang; Bück, Andreas

doi:10.1016/j.powtec.2022.117224

Cited by 8 publications

(4 citation statements)

References 80 publications

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“…In this case, the nanoparticles must be sufficiently dispersed before or during the coating process. A more detailed description of these mechanism is given in (Alonso et al, 1988;Pfeffer et al, 2001;Düsenberg et al, 2022b).…”

Section: Dry Particle Coatingmentioning

confidence: 99%

“…The effect of flowing aids applied as antistatics was also reported by Lexow and Drummer (Lexow and Drummer, 2016), while Düsenberg at al. (Düsenberg et al, 2022a;Düsenberg et al, 2022b). demonstrated that the tribo charging behavior of PP can be tuned by dry coating with fumed oxides: coating with HDK H05TX (Wacker Chemie), which exhibits HMDS/PDMS surface-termination, allows to produce a negatively charging composite powder, while coating PP with HDK H05TA 3 (Wacker Chemie), which exhibits PDMS / amine (-NR 2 ) termination, yields positively charging feedstock.…”

Section: Figurementioning

confidence: 99%

“…Dry particle coating for surface functionalization is not limited to the application of flow enhancers. One can think of many more types of surface functionalization including coloring and, thus, tailoring of the absorption behavior (Jadhav et al, 2019;Jadhav et al, 2020;Jadhav et al, 2021;Lüddecke et al, 2021;Pannitz et al, 2021), charge control (Düsenberg et al, 2022a;Düsenberg et al, 2022b), improvement of electrical conductivity (Blümel et al, 2014), tuning the performance of batteries (Cho and Cho, 2010) or tailoring the dissolution behavior (Linsenbühler and Wirth, 2005), to only name a few examples. Within this paper, we will review recent advances in the application of dry powder coating processes for modification of AM powders with a focus on feedstock materials for powder bed fusion (PBF), i.e., PBF of polymers with a laser beam (PBF-LB/P) and PBF of metals with a laser or electron beam (PBF-LB/M, PBF-EB/M).…”

Section: Introductionmentioning

confidence: 99%

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Dry powder coating in additive manufacturing

Schmidt

Peukert

2022

Front. Chem. Eng.

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Dry powder coating is used in many industries to tailor the bulk solid characteristics of cohesive powders. Within this paper, the state of the art of dry coating of feedstock materials for powder based additive manufacturing (AM) processes will be reviewed. The focus is on feedstock materials for powder bed fusion AM processes, such as powder bed fusion of polymers with a laser beam and powder bed fusion of metals with lasers or an electron beam. Powders of several microns to several ten microns in size are used and the feedstock’s bulk solid properties, especially the flowability and packing density are of immanent importance in different process steps in particular for powder dosing and spreading of powder layers onto the building area. All these properties can be tuned by dry particle coating. Moreover, possibilities to improve AM processability and to manipulate the resulting microstructure (c.f. grain refinement, dispersion strengthening) by adhering nanoparticles on the powders will be discussed. The effect of dry coating on the obtained powder properties along the whole AM process chain and the resulting part properties is assessed. Moreover, appropriate characterization methods for bulk solid properties of dry-coated AM powders are critically discussed.

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Section: Dry Particle Coatingmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dry powder coating in additive manufacturing

Schmidt

Peukert

2022

Front. Chem. Eng.

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“…The influencing factors for dry coating can be found on the process side as well as on the material side. On the process side, the following variables should be mentioned: the filling level of the mixer, the ratio of HP to GP to mixing aids, the process temperature [ 60 ], and the mechanical energy input (stirrer speed). On the material side, the particle sizes of the materials used, as well as the differentiation between conductive and non-conductive materials and the densities have an influence on the process result [ 61 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetizing Polymer Particles with a Solvent-Free Single Stage Process Using Superparamagnetic Iron Oxide Nanoparticles (SPION)s

et al. 2022

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Magnetic polymer composites are used in a variety of applications in many industries. Their production methods are usually time-consuming and solvent-intensive as they are performed in liquid phase processes, such as emulsion polymerization or precipitation. In this work, a quick, easy, and solvent-free method is presented to coat polymer particles with a discrete, non-coherent coating of superparamagnetic nanoparticles. The results of the dry coating process are evaluated optically, by means of scanning electron microscopy (SEM), via powder X-ray diffraction and thermally by means of differential scanning calorimetry, before finally demonstrating the effectiveness of dry coating by means of a vibrating sample magnetometer.

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Thermal rounding for shape modification of high-performance polyetherketoneketone and reinforced polyetherketoneketone-carbon fiber composite particles

et al. 2023

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This study presents shape transformation of anisotropic high-performance thermoplastic polyetherketoneketone (PEKK) and carbon fiber reinforced powder composite particles (HT-23) by thermal rounding. The shape transformation is achieved by (partial) melting of the high-temperature thermoplast microparticles. Three different process setups are presented, investigating the impact of the source of heat supply on the resulting shape modification: using a directly heated sheath gas flow, an indirect heat supply through the reactor wall and a combined approach. Regardless of the chosen setup, a modification of the particle shape was observable. The most advantageous shape transformation was observed in the indirect heating approach. In addition, the enhanced shape transformation yields an improved free flow behaviour of the powders, as quantified by ring-shear experiments. Reductions of the unconfined yield strengths of the powders for high consolidation stresses as high as 18 percent for PEKK and 30 percent for the HT-23 are achieved. Thereby, processability of the powder in laser based powder bed fusion is enhanced, extending the range of available (composite) polymer materials.

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Temperature influence on the triboelectric powder charging during dry coating of polypropylene with nanosilica particles

Cited by 8 publications

References 80 publications

Dry powder coating in additive manufacturing

Dry powder coating in additive manufacturing

Magnetizing Polymer Particles with a Solvent-Free Single Stage Process Using Superparamagnetic Iron Oxide Nanoparticles (SPION)s

Thermal rounding for shape modification of high-performance polyetherketoneketone and reinforced polyetherketoneketone-carbon fiber composite particles

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