Effects of fumed silica flow aids on flowability and packing of metal powders used in Binder-Jetting additive manufacturing process

Binder-Jetting is a fairly new sinter-based additive manufacturing technology for metals. Due to sintering, small particle size distributions are favorable, yet they are limiting the printing process due to bad flowability and compaction. This paper aims to resolve this contradiction by adding flow...

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Autores principales:	Anwar Shad, Robert Stache, Alexander Rütjes
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Flow aid Fumed silica Flowability Metal powder Binder-Jetting Additive manufacturing Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/33cb7634e3e744c799a286349632db1d
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spelling	oai:doaj.org-article:33cb7634e3e744c799a286349632db1d2021-11-28T04:27:42ZEffects of fumed silica flow aids on flowability and packing of metal powders used in Binder-Jetting additive manufacturing process0264-127510.1016/j.matdes.2021.110253https://doaj.org/article/33cb7634e3e744c799a286349632db1d2021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S026412752100808Xhttps://doaj.org/toc/0264-1275Binder-Jetting is a fairly new sinter-based additive manufacturing technology for metals. Due to sintering, small particle size distributions are favorable, yet they are limiting the printing process due to bad flowability and compaction. This paper aims to resolve this contradiction by adding flow aids to powders used in Binder-Jetting. Therefore 5 different powders with successively decreasing particle size distributions ranging from 32 µm (D90) to 5 µm (D90) are combined with 2 different fumed silica (aerosil) flow aids. Improvements are measured by the use of apparent and tap density as well as hausner ratio. Results show that the mixing process for flow aids and powders has significant influence on the improvements. Moreover, the amount of aerosil is a key criterion for optimized flow behavior. Improvements up to 42 % for apparent and 11 % for tap density are achieved. Hausner ratio can be improved up to 34 %. Preliminary printing results indicate that increased flowability and packing behavior also increases powder bed density and green density. The results are in line with existing theories regarding the use of flow aids in powders used in other industries and can be now be adopted for metal powders as well.Anwar ShadRobert StacheAlexander RütjesElsevierarticleFlow aidFumed silicaFlowabilityMetal powderBinder-JettingAdditive manufacturingMaterials of engineering and construction. Mechanics of materialsTA401-492ENMaterials & Design, Vol 212, Iss , Pp 110253- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Flow aid Fumed silica Flowability Metal powder Binder-Jetting Additive manufacturing Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	Flow aid Fumed silica Flowability Metal powder Binder-Jetting Additive manufacturing Materials of engineering and construction. Mechanics of materials TA401-492 Anwar Shad Robert Stache Alexander Rütjes Effects of fumed silica flow aids on flowability and packing of metal powders used in Binder-Jetting additive manufacturing process
description	Binder-Jetting is a fairly new sinter-based additive manufacturing technology for metals. Due to sintering, small particle size distributions are favorable, yet they are limiting the printing process due to bad flowability and compaction. This paper aims to resolve this contradiction by adding flow aids to powders used in Binder-Jetting. Therefore 5 different powders with successively decreasing particle size distributions ranging from 32 µm (D90) to 5 µm (D90) are combined with 2 different fumed silica (aerosil) flow aids. Improvements are measured by the use of apparent and tap density as well as hausner ratio. Results show that the mixing process for flow aids and powders has significant influence on the improvements. Moreover, the amount of aerosil is a key criterion for optimized flow behavior. Improvements up to 42 % for apparent and 11 % for tap density are achieved. Hausner ratio can be improved up to 34 %. Preliminary printing results indicate that increased flowability and packing behavior also increases powder bed density and green density. The results are in line with existing theories regarding the use of flow aids in powders used in other industries and can be now be adopted for metal powders as well.
format	article
author	Anwar Shad Robert Stache Alexander Rütjes
author_facet	Anwar Shad Robert Stache Alexander Rütjes
author_sort	Anwar Shad
title	Effects of fumed silica flow aids on flowability and packing of metal powders used in Binder-Jetting additive manufacturing process
title_short	Effects of fumed silica flow aids on flowability and packing of metal powders used in Binder-Jetting additive manufacturing process
title_full	Effects of fumed silica flow aids on flowability and packing of metal powders used in Binder-Jetting additive manufacturing process
title_fullStr	Effects of fumed silica flow aids on flowability and packing of metal powders used in Binder-Jetting additive manufacturing process
title_full_unstemmed	Effects of fumed silica flow aids on flowability and packing of metal powders used in Binder-Jetting additive manufacturing process
title_sort	effects of fumed silica flow aids on flowability and packing of metal powders used in binder-jetting additive manufacturing process
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/33cb7634e3e744c799a286349632db1d
work_keys_str_mv	AT anwarshad effectsoffumedsilicaflowaidsonflowabilityandpackingofmetalpowdersusedinbinderjettingadditivemanufacturingprocess AT robertstache effectsoffumedsilicaflowaidsonflowabilityandpackingofmetalpowdersusedinbinderjettingadditivemanufacturingprocess AT alexanderrutjes effectsoffumedsilicaflowaidsonflowabilityandpackingofmetalpowdersusedinbinderjettingadditivemanufacturingprocess
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Effects of fumed silica flow aids on flowability and packing of metal powders used in Binder-Jetting additive manufacturing process

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