Characterizing the feasibility of processing wet granular materials to improve rheology for 3D printing

Sweeney, Michael A.; Campbell, Loudon L.; Hanson, J M; Pantoya, Michelle L.; Christopher, Gordon F.

doi:10.1007/s10853-017-1404-z

Cited by 76 publications

(37 citation statements)

References 59 publications

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“…Accordingly, several parameters affect the manufactured part quality [6,7], like the temperature profile of the polymer and consequently the inter-layers bonding [8][9][10]. It is therefore important to understand how the process parameters affect the evolution of filaments temperature as mentioned [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Toward the understanding of temperature effect on bonding strength, dimensions and geometry of 3D-printed parts

et al. 2020

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Fused filament fabrication (FFF), which is an additive manufacturing technique, opens alternative possibilities for complex geometries fabrication. However, its use in functional products is limited due to anisotropic strength issues. Indeed, the strength of FFF fabricated parts across successive layers in the build direction (Z direction) can be significantly lower than the strength in X-Y directions. This strength weakness has been attributed to poor bonding between printed layers. This bonding depends on the temperature of the current layer being deposited-at melting temperature (T m)-and the temperature of the previously deposited layer. It is assumed that depositing a layer at T m on a layer at temperature around crystallization temperature (T c) would enable higher material crystallinity and thus better bonding between previous and present layers. On the contrary, if the previous layer temperature is below T c , material crystallinity will be low and bonding strength weak. This paper aims at studying the significant effect of temperature difference (DT) between previous and current deposited layers temperatures on (1) inter-layers bonding strength improvement and (2) part dimensions, geometry and structure stability. A 23% increase in the inter-layers bonding strength for previous layer temperature slightly higher than T c reported here confirms the above assumption and offers a first solution toward the increase in inter-layers bonding strength in FFF.

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Section: Introductionmentioning

confidence: 99%

Toward the understanding of temperature effect on bonding strength, dimensions and geometry of 3D-printed parts

et al. 2020

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“…the stress value below which the paste does not flow. This ensures the minimum pressure necessary to create the flow 43 . Also the paste has to have yielding property in order to maintain its shape after exiting the nozzle 38,40 .…”

Section: Discussionmentioning

confidence: 99%

3D printed dielectric ceramic without a sintering stage

Väätäjä

Kähäri

Ohenoja

et al. 2018

Sci Rep

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This paper presents for the first time the fabrication of dielectric ceramic parts by 3D printing without sintering. The printable paste was prepared by mixing a carefully selected amount of water-soluble Li2MoO4 powder with water. A viscous mixture of solid ceramic particles and saturated aqueous phase was formed with a solid content of 60.0 vol.%. Printing of the sample discs was conducted with material extrusion using a low-cost syringe-style 3D printer. The consolidation and densification of the printed parts occurred during both printing and drying of the paste due to extrusion pressure, capillary forces, and recrystallization of the dissolved Li2MoO4. Complete drying of the paste was ensured by heating at 120 °C. The microstructure showed no delamination of the printed layers. Relatively high densities and good dielectric properties were obtained, especially when considering that no sintering and only pressure from the extrusion was employed. This approach is expected to be feasible for similar ceramics and ceramic composites.

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“…Chemical composition influences the production and performance of energetic inks, as well as the particle size distribution of solids, mass percent of solid particles and viscoelastic properties of the ink. As an example, Figures 15a-c summarize the results of the study by Cristopher et al [181] reporting the extrusion of a material with variations in the particle size of solids, nozzle diameter, and pressure level. The ink comprised 80 wt.% mock energetic material (pentaerythritol) in a silicon-based binder.…”

Section: Progress In Additive Manufacturing Of Energetic Materialsmentioning

confidence: 99%

Progress in Additive Manufacturing of Energetic Materials: Creating the Reactive Microstructures with High Potential of Applications

Muravyev

Моногаров

Schaller

et al. 2019

Propellants Explo Pyrotec

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The modern “energetic‐on‐a‐chip” trend envisages reducing size and cost while increasing safety and maintaining the performance of energetic articles. However, the fabrication of reactive structures at micro‐ and nanoscales remains a challenge due to the spatial limitations of traditional tools and technologies. These mature techniques, such as melt casting or slurry curing, represent the formative approach to design as distinct from the emerging additive manufacturing (3D printing). The present review discusses various methods of additive manufacturing based on their governing principles, robustness, sample throughput, feasible compositions and available geometries. For chemical composition, nanothermites are among the most promising systems due to their high ignition fidelity and energetic performance. Applications of reactive microstructures are highlighted, including initiators, thrusters, gun propellants, caseless ammunition, joining and biocidal agents. A better understanding of the combustion and detonation phenomena at the micro‐ and nanoscale along with the advancement of deposition technologies will bring further developments in this field, particularly for the design of micro/nanoelectromechanical systems (MEMS/NEMS) and propellant grains with improved performance.

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Characterizing the feasibility of processing wet granular materials to improve rheology for 3D printing

Cited by 76 publications

References 59 publications

Toward the understanding of temperature effect on bonding strength, dimensions and geometry of 3D-printed parts

Toward the understanding of temperature effect on bonding strength, dimensions and geometry of 3D-printed parts

3D printed dielectric ceramic without a sintering stage

Progress in Additive Manufacturing of Energetic Materials: Creating the Reactive Microstructures with High Potential of Applications

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