Quality over Quantity: How Different Dispersion Qualities of Minute Amounts of Nano-Additives Affect Material Properties in Powder Bed Fusion of Polyamide 12
Alexander Sommereyns,Stan Gann,Jochen Schmidt,Abootorab Baqerzadeh Chehreh,Arne Lüddecke,Frank Walther,Bilal Gökce,Stephan Barcikowski,Michael Schmidt +8 more
TLDR
In this paper, the impact of the quantity and dispersion quality of carbon nanoparticles deposited on polyamide 12 particles is investigated using tensile and cubic specimens manufactured under the same process conditions.Abstract:
The great interest, within the fields of research and industry, in enhancing the range and functionality of polymer powders for laser powder bed fusion (LB-PBF-P) increases the need for material modifications. To exploit the full potential of the additivation method of feedstock powders with nanoparticles, the influence of nanoparticles on the LB-PBF process and the material behavior must be understood. In this study, the impact of the quantity and dispersion quality of carbon nanoparticles deposited on polyamide 12 particles is investigated using tensile and cubic specimens manufactured under the same process conditions. The nano-additives are added through dry coating and colloidal deposition. The specimens are analyzed by tensile testing, differential scanning calorimetry, polarized light and electron microscopy, X-ray diffraction, infrared spectroscopy, and micro-computed tomography. The results show that minute amounts (0.005 vol%) of highly dispersed carbon nanoparticles shift the mechanical properties to higher ductility at the expense of tensile strength. Despite changes in crystallinity due to nano-additives, the crystalline phases of polyamide 12 are retained. Layer bonding and part densities strongly depend on the quantity and dispersion quality of the nanoparticles. Nanoparticle loadings for CO2 laser-operated PBF show only minor changes in material properties, while the potential is greater at lower laser wavelengths.read more
Citations
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New Frontiers in Materials Design for Laser Additive Manufacturing
TL;DR: Laser-based additive manufacturing (LAM) in all its variations is now being established as a technique for manufacturing components from various material types and alloys as discussed by the authors , and it can be used for various applications.
Journal ArticleDOI
Dry powder coating in additive manufacturing
Jochen Schmidt,Wolfgang Peukert +1 more
TL;DR: In this article , the state of the art of dry coating of feedstock materials for powder-based additive manufacturing (AM) processes is reviewed and appropriate characterization methods for bulk solid properties of dry-coated AM powders are critically discussed.
References
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Processing of a Polyamide-12/carbon nanofibre composite by laser sintering
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TL;DR: In this article, the reinforcement of laser sintered polyamides with carbon nanofibres (CNFs) was investigated, and the effects of CNF addition on the processing parameters and mechanical properties of laser-sintered parts have been investigated.
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Comparative study on 3D printing of polyamide 12 by selective laser sintering and multi jet fusion
Chao Cai,Wei Shian Tey,Jiayao Chen,Wei Zhu,Xingjian Liu,Tong Liu,Lihua Zhao,Lihua Zhao,Kun Zhou +8 more
TL;DR: In this paper, a comparison of polyamide 12 (PA12) parts printed by SLS and MJF was conducted on the physicochemical characterization of raw powder materials (EOS PA2200 and HP 3D HR PA12) and their printed specimens, as well as the mechanical performance and printing characteristics of printed objects.
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A review of the process physics and material screening methods for polymer powder bed fusion additive manufacturing
TL;DR: In polymer powder bed fusion (PBF), an infra-red energy source selectively fuses powder particles layer-by-layer into a three-dimensional structure, which enables the production of parts without the use of a mold, which is useful for prototyping and low volume production as discussed by the authors.
Journal ArticleDOI
Processing and characterization of a carbon black-filled electrically conductive Nylon-12 nanocomposite produced by selective laser sintering
TL;DR: In this paper, an electrically conductive polymer nanocomposite made of Nylon-12 reinforced with 4-wt% of carbon black was used for selective laser sintering.