Robocasting of carbon-alumina core-shell composites using co-extrusion

Zongwen Fu, Matthias Freihart, Tobias Schlordt, Tobias Fey, Torsten Kraft, Peter Greil, Nahum Travitzky

Результат исследований: Материалы для журналаСтатья

5 Цитирования (Scopus)

Выдержка

Purpose - This study aims to achieve the fabrication of three-dimensional core-shell filament-based lattice structures by means of robocasting combined with co-extrusion. For core and shell materials, colloidal gels composed of submicron carbon and alumina powders were developed, respectively. Simultaneously, the co-extrusion process was also studied by numerical simulation to investigate the feed pressure-dependent wall thickness. Design/methodology/approach - Significant differences in the rheological behavior of the carbon and alumina gels were observed because of differences of the particle morphology and surface chemistry of the carbon and alumina powders. Precise control over the cross-sectional diameter of the core and shell green state elements was achieved by alteration of the feed pressures used during co-extrusion. Findings - After subsequent thermal treatment in an oxidizing atmosphere (e.g. air), in which the carbon core was oxidized and burned out, lattice structures formed of hollow filaments of predetermined wall thickness were manufactured; additionally, C-Al2O3 core-shell filament lattice structures could be derived after firing in an argon atmosphere. Originality/value - Green lattice truss structures with carbon core and alumina shell filaments were successfully manufactured by robotically controlled co-extrusion. As feedstocks carbon and alumina gels with significantly different rheological properties were prepared. During co-extrusion, the core paste exhibited a much higher viscosity than the shell paste, which benefited the co-extrusion process. Simultaneously, the core and shell diameters were exactly controlled by core and shell feed pressures and studied by numerical simulation. The experimentally and numerically derived filament wall thickness showed qualitative agreement with each other; with decreasing core pressure during co-extrusion, the wall thickness increased.

Язык оригиналаАнглийский
Страницы (с-по)423-433
Число страниц11
ЖурналRapid Prototyping Journal
Том23
Номер выпуска2
DOI
СостояниеОпубликовано - 1 янв 2017
Опубликовано для внешнего пользованияДа

Отпечаток

Extrusion
Alumina
Carbon
Composite materials
Gels
Powders
Computer simulation
Surface chemistry
Feedstocks
Particles (particulate matter)
Argon
Heat treatment
Viscosity
Fabrication
Air

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Цитировать

Robocasting of carbon-alumina core-shell composites using co-extrusion. / Fu, Zongwen; Freihart, Matthias; Schlordt, Tobias; Fey, Tobias; Kraft, Torsten; Greil, Peter; Travitzky, Nahum.

В: Rapid Prototyping Journal, Том 23, № 2, 01.01.2017, стр. 423-433.

Результат исследований: Материалы для журналаСтатья

Fu, Z, Freihart, M, Schlordt, T, Fey, T, Kraft, T, Greil, P & Travitzky, N 2017, 'Robocasting of carbon-alumina core-shell composites using co-extrusion', Rapid Prototyping Journal, том. 23, № 2, стр. 423-433. https://doi.org/10.1108/RPJ-12-2015-0191
Fu Z, Freihart M, Schlordt T, Fey T, Kraft T, Greil P и соавт. Robocasting of carbon-alumina core-shell composites using co-extrusion. Rapid Prototyping Journal. 2017 Янв. 1;23(2):423-433. https://doi.org/10.1108/RPJ-12-2015-0191
Fu, Zongwen ; Freihart, Matthias ; Schlordt, Tobias ; Fey, Tobias ; Kraft, Torsten ; Greil, Peter ; Travitzky, Nahum. / Robocasting of carbon-alumina core-shell composites using co-extrusion. В: Rapid Prototyping Journal. 2017 ; Том 23, № 2. стр. 423-433.
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abstract = "Purpose - This study aims to achieve the fabrication of three-dimensional core-shell filament-based lattice structures by means of robocasting combined with co-extrusion. For core and shell materials, colloidal gels composed of submicron carbon and alumina powders were developed, respectively. Simultaneously, the co-extrusion process was also studied by numerical simulation to investigate the feed pressure-dependent wall thickness. Design/methodology/approach - Significant differences in the rheological behavior of the carbon and alumina gels were observed because of differences of the particle morphology and surface chemistry of the carbon and alumina powders. Precise control over the cross-sectional diameter of the core and shell green state elements was achieved by alteration of the feed pressures used during co-extrusion. Findings - After subsequent thermal treatment in an oxidizing atmosphere (e.g. air), in which the carbon core was oxidized and burned out, lattice structures formed of hollow filaments of predetermined wall thickness were manufactured; additionally, C-Al2O3 core-shell filament lattice structures could be derived after firing in an argon atmosphere. Originality/value - Green lattice truss structures with carbon core and alumina shell filaments were successfully manufactured by robotically controlled co-extrusion. As feedstocks carbon and alumina gels with significantly different rheological properties were prepared. During co-extrusion, the core paste exhibited a much higher viscosity than the shell paste, which benefited the co-extrusion process. Simultaneously, the core and shell diameters were exactly controlled by core and shell feed pressures and studied by numerical simulation. The experimentally and numerically derived filament wall thickness showed qualitative agreement with each other; with decreasing core pressure during co-extrusion, the wall thickness increased.",
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T1 - Robocasting of carbon-alumina core-shell composites using co-extrusion

AU - Fu, Zongwen

AU - Freihart, Matthias

AU - Schlordt, Tobias

AU - Fey, Tobias

AU - Kraft, Torsten

AU - Greil, Peter

AU - Travitzky, Nahum

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N2 - Purpose - This study aims to achieve the fabrication of three-dimensional core-shell filament-based lattice structures by means of robocasting combined with co-extrusion. For core and shell materials, colloidal gels composed of submicron carbon and alumina powders were developed, respectively. Simultaneously, the co-extrusion process was also studied by numerical simulation to investigate the feed pressure-dependent wall thickness. Design/methodology/approach - Significant differences in the rheological behavior of the carbon and alumina gels were observed because of differences of the particle morphology and surface chemistry of the carbon and alumina powders. Precise control over the cross-sectional diameter of the core and shell green state elements was achieved by alteration of the feed pressures used during co-extrusion. Findings - After subsequent thermal treatment in an oxidizing atmosphere (e.g. air), in which the carbon core was oxidized and burned out, lattice structures formed of hollow filaments of predetermined wall thickness were manufactured; additionally, C-Al2O3 core-shell filament lattice structures could be derived after firing in an argon atmosphere. Originality/value - Green lattice truss structures with carbon core and alumina shell filaments were successfully manufactured by robotically controlled co-extrusion. As feedstocks carbon and alumina gels with significantly different rheological properties were prepared. During co-extrusion, the core paste exhibited a much higher viscosity than the shell paste, which benefited the co-extrusion process. Simultaneously, the core and shell diameters were exactly controlled by core and shell feed pressures and studied by numerical simulation. The experimentally and numerically derived filament wall thickness showed qualitative agreement with each other; with decreasing core pressure during co-extrusion, the wall thickness increased.

AB - Purpose - This study aims to achieve the fabrication of three-dimensional core-shell filament-based lattice structures by means of robocasting combined with co-extrusion. For core and shell materials, colloidal gels composed of submicron carbon and alumina powders were developed, respectively. Simultaneously, the co-extrusion process was also studied by numerical simulation to investigate the feed pressure-dependent wall thickness. Design/methodology/approach - Significant differences in the rheological behavior of the carbon and alumina gels were observed because of differences of the particle morphology and surface chemistry of the carbon and alumina powders. Precise control over the cross-sectional diameter of the core and shell green state elements was achieved by alteration of the feed pressures used during co-extrusion. Findings - After subsequent thermal treatment in an oxidizing atmosphere (e.g. air), in which the carbon core was oxidized and burned out, lattice structures formed of hollow filaments of predetermined wall thickness were manufactured; additionally, C-Al2O3 core-shell filament lattice structures could be derived after firing in an argon atmosphere. Originality/value - Green lattice truss structures with carbon core and alumina shell filaments were successfully manufactured by robotically controlled co-extrusion. As feedstocks carbon and alumina gels with significantly different rheological properties were prepared. During co-extrusion, the core paste exhibited a much higher viscosity than the shell paste, which benefited the co-extrusion process. Simultaneously, the core and shell diameters were exactly controlled by core and shell feed pressures and studied by numerical simulation. The experimentally and numerically derived filament wall thickness showed qualitative agreement with each other; with decreasing core pressure during co-extrusion, the wall thickness increased.

KW - Additive manufacturing

KW - CFD simulation

KW - Co-extrusion

KW - Colloidal gel

KW - Hollow ligament

KW - Robocasting

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