Processing of a Polyamide-12/carbon nanofibre composite by laser sintering

Commercially available materials for selective laser sintering (SLS) include mainly semicrystalline polymers and only a few composites like polyamide 12 filled with glass beads or aluminum. Powder composites can be used for setting tailored properties. Exemplarily, mechanical properties as well as thermal or electrical conductivity can be improved. Thermally conductive SLS parts filled with copper particles have not been under investigation before. This study contains the characterization of polyamide 12 filled with copper acting as a metal filler with a high thermal conductivity. Two composites differing in the filler shapes are investigated concerning powder properties and the resulting processability. The thermal conductivity in dependence on the filler content and anisotropy is of major interest. Isotropic, spherically shaped copper fillers are compared with strongly anisotropic flakes leading to the result that a much lower content of anisotropic filler is needed to reach an increased thermal conductivity. However, the powder flowability and processability is also highly influenced by the filler shape and content. Fillers with a similar shape like the matrix powder lead to a better flowability allowing higher filler contents. POLYM. COMPOS., 40:1801–1809, 2019. © 2018 The Authors Polymer Composites published by Wiley Periodicals, Inc. on behalf of Society of Plastics Engineers

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“…5) have a high aspect ratio of $35 with anisotropic properties. The measured bulk density is 1.1 g/cm 3 (own measurement according to EN ISO 60).…”

Section: Powder Analysismentioning

confidence: 99%

Selective laser sintering of copper filled polyamide 12: Characterization of powder properties and process behavior

et al. 2018

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“…For a long time, polyamides (PA11 and PA12) have predominantly been used for a standard LS process, due to their excellent processability. The incorporation of reinforcement to polyamides can lead to composite components with improved performance and widened applications [2][3][4]. However, for harsh environments such as aerospace, defence and gas applications, the currently available polymers for LS cannot meet these requirements.…”

Section: Introductionmentioning

confidence: 99%

A new method to prepare composite powders customized for high temperature laser sintering

Yazdani

Chen

Benedetti

et al. 2018

Composites Science and Technology

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Composites have the potential to enhance the mechanical properties of components fabricated by additive manufacturing; however, the bottleneck is the limited number of polymeric composite powders available for this manufacturing process. This paper describes a generically new method to create composite powders that are suitable for High Temperature Laser Sintering (HT-LS). C-coated Inorganic Fullerene-like WS 2 (IF-WS 2 ) nanoparticles and graphene nanoplatelets (GNPs) have been chosen to demonstrate their incorporation into a high performance polymer matrix: Poly Ether Ether Ketone (PEEK). The morphological and physical property investigations have confirmed that the resulting composite powders exhibit the desired particle morphology, size, distribution and flowability for HT-LS applications. Further preliminary sintering results have demonstrated that they are comparable to the currently available commercial grade of PEEK powder HT-LS applications in terms of powder packing properties and flow ability. The new strategy reported here brings in great potential for the additive layer manufacturing of high performance polymeric composite components with improved mechanical and added functionalities by choosing the proper matrix and filler combination.

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“…Polymers have been filled with different types of nanomaterials such as carbon nanotubes 11,12 or carbon nanofibers. 13 Among all the nanofillers, nanoclay (mostly montmorillonite) is the most commonly used because of the remarkable changes exhibited by the polymer after adding a small amount of nanoclay. 5,14 Montmorillonite (MMT) is an inorganic, layered silicate and the hydrophilic clay interacts only weakly with organic polymers (typically hydrophobic ones); it tends to aggregate to form large agglomerations in the matrix.…”

Section: Introductionmentioning

confidence: 99%

Nanoclay/Polymer Composite Powders for Use in Laser Sintering Applications: Effects of Nanoclay Plasma Treatment

Almansoori

Majewski

Rodenburg

2017

JOM

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Plasma-etched nanoclay-reinforced Polyamide 12 (PA12) powder is prepared with its intended use in selective laser sintering (LS) applications. To replicate the LS process we present a downward heat sintering (DHS) process, carried out in a hot press, to fabricate tensile test specimens from the composite powders. The DHS parameters are optimized through hot stage microscopy, which reveal that the etched clay (EC)-based PA12 (EC/PA12) nanocomposite powder melts at a temperature 2°C higher than that of neat PA12, and 1-3°C lower than that of the nonetched clay-based nanocompsite (NEC/PA12 composite). We show that these temperature differences are critical to successful LS. The distribution of EC and NEC onto PA12 is investigated by scanning electron microscopy (SEM). SEM images show clearly that the plasma treatment prevents the micron-scale aggregation of the nanoclay, resulting in an improved elastic modulus of EC/PA12 when compared with neat PA12 and NEC/PA12. Moreover, the reduction in elongation at break for EC/PA12 is less pronounced than for NEC/PA12.

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Processing of a Polyamide-12/carbon nanofibre composite by laser sintering

Cited by 203 publications

References 18 publications

Selective laser sintering of copper filled polyamide 12: Characterization of powder properties and process behavior

Selective laser sintering of copper filled polyamide 12: Characterization of powder properties and process behavior

A new method to prepare composite powders customized for high temperature laser sintering

Nanoclay/Polymer Composite Powders for Use in Laser Sintering Applications: Effects of Nanoclay Plasma Treatment

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