Process control of surface quality and part microstructure in selective laser sintering involving highly degraded polyamide 12 materials

Polyamide 12 is one of the most extensively used semi-crystalline polymer materials to date in selective laser sintering (SLS) additive manufacturing, or SLS 3D printing. In this powder-based direct digital manufacturing process, a substantial amount of expensive materials remains un-sintered, recyc...

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Autores principales:	Feifei Yang, Tianyu Jiang, Greg Lalier, John Bartolone, Xu Chen
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Selective laser sintering Aging and degradation Surface quality improvement Post-heating Roughness and unmolten particles Polymers and polymer manufacture TP1080-1185
Acceso en línea:	https://doaj.org/article/bbe0b202ee284864b2f419bff151332c
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spelling	oai:doaj.org-article:bbe0b202ee284864b2f419bff151332c2021-11-24T04:24:21ZProcess control of surface quality and part microstructure in selective laser sintering involving highly degraded polyamide 12 materials0142-941810.1016/j.polymertesting.2020.106920https://doaj.org/article/bbe0b202ee284864b2f419bff151332c2021-01-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0142941820321498https://doaj.org/toc/0142-9418Polyamide 12 is one of the most extensively used semi-crystalline polymer materials to date in selective laser sintering (SLS) additive manufacturing, or SLS 3D printing. In this powder-based direct digital manufacturing process, a substantial amount of expensive materials remains un-sintered, recyclable, and reusable. Recently, understanding the mechanisms of degradation and the reusability of reclaimed polyamide 12 powders has attracted increasing industrial and research interests. However, using reclaimed polyamide 12 powder in SLS results in problems with part surface quality such as undesirable part surface finish with poor textures and numerous un-sintered particles. Limited research is available on the improvement of part surface quality. In particular, results barely exist on improving or modifying the surface quality of parts using extremely aged powders – powders that are held close to the heat-affected zones (HAZs) and suffer from severe degradations during the sintering process. To improve the surface quality and to build interrelations between process parameters and surface quality, we propose a novel approach for SLS with (extremely) aged polyamide 12 powders. By combining material preparation, powder and part characterizations, and SLS with customized post-heating, we obtain parts with improved surface quality (e.g., reduced roughness and porosities, and eliminated un-sintered particles). Particularly, parts 3D-printed using the 30%-30%–40% new-aged-extremely-aged powder mixtures exhibit the smoothest and flattest surface with no unmolten particles and nearly zero porosity.Feifei YangTianyu JiangGreg LalierJohn BartoloneXu ChenElsevierarticleSelective laser sinteringAging and degradationSurface quality improvementPost-heatingRoughness and unmolten particlesPolymers and polymer manufactureTP1080-1185ENPolymer Testing, Vol 93, Iss , Pp 106920- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Selective laser sintering Aging and degradation Surface quality improvement Post-heating Roughness and unmolten particles Polymers and polymer manufacture TP1080-1185
spellingShingle	Selective laser sintering Aging and degradation Surface quality improvement Post-heating Roughness and unmolten particles Polymers and polymer manufacture TP1080-1185 Feifei Yang Tianyu Jiang Greg Lalier John Bartolone Xu Chen Process control of surface quality and part microstructure in selective laser sintering involving highly degraded polyamide 12 materials
description	Polyamide 12 is one of the most extensively used semi-crystalline polymer materials to date in selective laser sintering (SLS) additive manufacturing, or SLS 3D printing. In this powder-based direct digital manufacturing process, a substantial amount of expensive materials remains un-sintered, recyclable, and reusable. Recently, understanding the mechanisms of degradation and the reusability of reclaimed polyamide 12 powders has attracted increasing industrial and research interests. However, using reclaimed polyamide 12 powder in SLS results in problems with part surface quality such as undesirable part surface finish with poor textures and numerous un-sintered particles. Limited research is available on the improvement of part surface quality. In particular, results barely exist on improving or modifying the surface quality of parts using extremely aged powders – powders that are held close to the heat-affected zones (HAZs) and suffer from severe degradations during the sintering process. To improve the surface quality and to build interrelations between process parameters and surface quality, we propose a novel approach for SLS with (extremely) aged polyamide 12 powders. By combining material preparation, powder and part characterizations, and SLS with customized post-heating, we obtain parts with improved surface quality (e.g., reduced roughness and porosities, and eliminated un-sintered particles). Particularly, parts 3D-printed using the 30%-30%–40% new-aged-extremely-aged powder mixtures exhibit the smoothest and flattest surface with no unmolten particles and nearly zero porosity.
format	article
author	Feifei Yang Tianyu Jiang Greg Lalier John Bartolone Xu Chen
author_facet	Feifei Yang Tianyu Jiang Greg Lalier John Bartolone Xu Chen
author_sort	Feifei Yang
title	Process control of surface quality and part microstructure in selective laser sintering involving highly degraded polyamide 12 materials
title_short	Process control of surface quality and part microstructure in selective laser sintering involving highly degraded polyamide 12 materials
title_full	Process control of surface quality and part microstructure in selective laser sintering involving highly degraded polyamide 12 materials
title_fullStr	Process control of surface quality and part microstructure in selective laser sintering involving highly degraded polyamide 12 materials
title_full_unstemmed	Process control of surface quality and part microstructure in selective laser sintering involving highly degraded polyamide 12 materials
title_sort	process control of surface quality and part microstructure in selective laser sintering involving highly degraded polyamide 12 materials
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/bbe0b202ee284864b2f419bff151332c
work_keys_str_mv	AT feifeiyang processcontrolofsurfacequalityandpartmicrostructureinselectivelasersinteringinvolvinghighlydegradedpolyamide12materials AT tianyujiang processcontrolofsurfacequalityandpartmicrostructureinselectivelasersinteringinvolvinghighlydegradedpolyamide12materials AT greglalier processcontrolofsurfacequalityandpartmicrostructureinselectivelasersinteringinvolvinghighlydegradedpolyamide12materials AT johnbartolone processcontrolofsurfacequalityandpartmicrostructureinselectivelasersinteringinvolvinghighlydegradedpolyamide12materials AT xuchen processcontrolofsurfacequalityandpartmicrostructureinselectivelasersinteringinvolvinghighlydegradedpolyamide12materials
_version_	1718416056487247872

Process control of surface quality and part microstructure in selective laser sintering involving highly degraded polyamide 12 materials

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