Processability of SS316L powder - binder mixtures for vertical extrusion and deposition on table tests

Rane, Kedarnath; Landro, Luca Angelo Di; Strano, Matteo

doi:10.1016/j.powtec.2019.01.010

Cited by 25 publications

(9 citation statements)

References 31 publications

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“…The peak of this profile increases with increasing wall temperature and decreasing average extrusion speed. This fact is assumed to play a key role in print quality and cross-section of strand gets more elliptical and closer to earlier results [13,43]. 3.…”

Section: Discussionsupporting

confidence: 89%

Implementation of viscosity and density models for improved numerical analysis of melt flow dynamics in the nozzle during extrusion-based additive manufacturing

et al. 2021

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Fused Filament Fabrication (FFF) is an Additive Manufacturing (AM) process that builds up a part via layer by layer deposition of polymeric material. The purpose of this study is to implement viscosity and density models for improving the assessment of melt flow behavior inside the nozzle during deposition. Numerical simulations are carried out for different combinations of important process parameters like extrusion velocity Ve, extrusion temperature Te, and filament material (Acrylonitrile Butadiene Styrene (ABS) and Polylactic Acid (PLA)). Cross-Williams–Landel–Ferry (Cross-WLF) viscosity and Pressure–Volume–Temperature (PVT) density models are incorporated to get realistic results. Distribution of printing parameters like pressure, temperature, velocity and viscosity inside the nozzle are observed at steady state and their relationship with the print quality is discussed. Effect of the PVT model on polymer deposition is illustrated by comparing it with deposition considering a constant density. Velocity profiles are obtained for the different cases considered and locations where the flow is fully developed, along the axial distance of the nozzle, are determined and termed as stable zones. A direct correlation between the position of the developed melt flow profile and printing quality is established and the best combination of printing parameters is proposed for ABS and PLA. Extended stable zones are obtained for the polymer melt in the nozzle at Ve = 60 mm/s, Te = 220 °C for ABS and Ve = 30 mm/s and Te = 195 °C for PLA and hence, these can be considered as the optimum values of the printing parameters.

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Section: Discussionsupporting

confidence: 89%

Implementation of viscosity and density models for improved numerical analysis of melt flow dynamics in the nozzle during extrusion-based additive manufacturing

et al. 2021

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“…A basic comparison of some of the main Metal 3D printing processes for use in the construction sector (Frazier 2014;B. Wu et al 2018;Gu et al 2012;Fayazfar et al 2018;Motta, Demir, and Previtali 2018;Rane, Di Landro, and Strano 2019;Bai, Wagner, and Williams 2017) Table 2. Material availability by some of the main LPBF system providers declared in their websites.…”

Section: List Of Tablesmentioning

confidence: 99%

Role of metal 3D printing to increase quality and resource-efficiency in the construction sector

Kanyilmaz

Demir

Chierici

et al. 2022

Additive Manufacturing

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“…Another process consists of extrusion printing of a metal powder-polymer (binder) composite paste followed by removing the polymer (debinding) and the sintering of the powder. Various powders have been tested, such as 17-4 PH [19] and SS 316 [20,21] steels, zirconia [22,23], and alumina [24] for the extrusion 3D printing and sintering process by developing metal/ceramic-binder mixture. Also, a few studies have explored extrusion printing of pure copper.…”

Section: Introductionmentioning

confidence: 99%

Copper additive manufacturing using MIM feedstock: adjustment of printing, debinding, and sintering parameters for processing dense and defectless parts

Singh

Missiaen

Bouvard

et al. 2021

Int J Adv Manuf Technol

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In the present study, an additive manufacturing process of copper using extrusion 3D printing, solvent and thermal debinding, and sintering was explored. Extrusion 3D printing of metal injection moulding (MIM) feedstock was used to fabricate green body samples. The printing process was performed with optimized parameters to achieve high green density and low surface roughness. To remove water-soluble polymer, the green body was immersed in water for solvent debinding. The interconnected voids formed during solvent debinding were favorable for removing the backbone polymer from the brown body during thermal debinding. Thermal debinding was performed up to 500 °C, and ~ 6.5% total weight loss of the green sample was estimated. Finally, sintering of the thermally debinded samples was performed at 950, 1000, 1030, and 1050°C. The highest sintering temperature provided the highest relative density (94.5%) and isotropic shrinkage. Micro-computed tomography (μCT) examination was performed on green samples and sintered samples, and qualitative and quantitative analysis of the porosity confirmed the benefits of optimized printing conditions for the final microstructure. This work opens up the opportunity for 3D printing and sintering to produce pure copper components with complicated shapes and high density, utilizing raw MIM feedstock as the starting material.

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Processability of SS316L powder - binder mixtures for vertical extrusion and deposition on table tests

Cited by 25 publications

References 31 publications

Implementation of viscosity and density models for improved numerical analysis of melt flow dynamics in the nozzle during extrusion-based additive manufacturing

Implementation of viscosity and density models for improved numerical analysis of melt flow dynamics in the nozzle during extrusion-based additive manufacturing

Role of metal 3D printing to increase quality and resource-efficiency in the construction sector

Copper additive manufacturing using MIM feedstock: adjustment of printing, debinding, and sintering parameters for processing dense and defectless parts

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