Investigation into mechanical and microstructural properties of polypropylene manufactured by selective laser sintering in comparison with injection molding counterparts

Zhu, Wei; Yan, Chunze; Shi, Yunsong; Wen, Shifeng; Liu, Jie; Shi, Yusheng

doi:10.1016/j.matdes.2015.05.043

Cited by 99 publications

(74 citation statements)

References 37 publications

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“…The temperature range between the initial melting temperature (T im ) and the initial crystallization temperature (T ic ) is defined as the SLS sintering window . For semicrystalline polymers, the preheating temperature (T b ) of powder bed should be kept close to T im to avoid warp and curl of the sintered layer.…”

Section: Resultsmentioning

confidence: 99%

Solid‐state shear milling method to prepare PA12/boron nitride thermal conductive composite powders and their selective laser sintering 3D‐printing

Yang

Wang

Chen

2019

J of Applied Polymer Sci

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The selective laser sintering (SLS) is one of the most important 3D‐printing technologies. However, the challenges in SLS could be in the limited high material cost and single material performance. Development of high‐performance and multifunctional copowders suitable for SLS is of great importance. Here, polyamide 12 (PA12)/boron nitride (BN) thermal conductive copowders suitable for SLS were successfully prepared through solid state shear milling (S3M) technology in combination with cryogenic pulverization technology. The particle size, morphology, grafting reaction between PA12 and BN, rheology behavior, and coalescence behavior of the obtained PA12/BN copowders were carefully investigated. The optimal amount of silica flow additive (0.5 wt %) was determined to achieve the good powder flowability. Under the optimum 3D‐printing conditions, the fabrication of parts with high BN loading could be achieved. When BN content was at 40 wt %, the flexural strength could reach 10.6 MPa and the thermal conductivity could reach 0.55 W/m·k, 77% higher than that of pure PA12. After treated with phenolic epoxy resin, the tensile strength and flexural strength of the printed parts with 40 wt % BN loading could reach 14.2 and 25.6 MPa, which were 130 and 115% higher than those of the untreated 3D‐printed parts, respectively. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48766.

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Section: Resultsmentioning

confidence: 99%

Solid‐state shear milling method to prepare PA12/boron nitride thermal conductive composite powders and their selective laser sintering 3D‐printing

Yang

Wang

Chen

2019

J of Applied Polymer Sci

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“…A continuous wave CO 2 laser (k = 10.6 μm) was equipped, which could be adjusted from 0 to 30 W. The powder was preheated by infrared radiation heating pipes before sintering. The effect parameters on the quality of SLS fabricated components included the laser power (p), laser scanning speed (v), laser scanning spacing (s), layer thickness (h) and powder bed temperature (T b ).The energy density (ED) was generally defined as the amount of energy input in a unit volume, which can be calculated by the equation (1) [43]. Three major parameters were fluctuated at discrete time intervals, including laser power, scanning speed and laser scanning spacing.…”

Section: Preparation Of Tpu Samples Via Slsmentioning

confidence: 99%

Microscopic morphology, thermodynamic and mechanical properties of thermoplastic polyurethane fabricated by selective laser sintering

Pan

Liu

Zheng³

et al. 2020

Mater. Res. Express

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Thermoplastic polyurethane (TPU) is one of the elastomeric polymers which has widespread applicability in various fields. Selective laser sintering (SLS) technology is gradually being used to manufacture actual end-use components and enables novel applications (footwear, healthcare mattresses, cable and wire) for TPU. This work aims to explore an optimum protocol (laser power, scanning speed and layer thickness) for SLS fabricated TPU components, and to evaluate the processability of TPU powder through systematically analyzing the morphological properties, structure, melting temperature, crystallization characteristics and tensile properties under different processing parameters. The optimum SLS processing parameters for TPU are laser speed of 3500 mm s −1 , laser power of 25 W and layer thickness of 0.1 mm. The tensile strength and superlative toughness of SLS-fabricated TPU samples can reach up to 20.02 MPa and 26 631 J mm −3 , respectively. The tensile strength of optimized SLS specimens (parameters: 20 W, 4500 mm s −1 , 0.15 mm) has been increased by 87.1% compared to that of reference.

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“…As previously reported by Zhu et. al, a lower energy density resulted in the formation of voids in the sample while higher energy densities resulted in a more dense sample [39]. This would be expected to influence the electrical conductivity.…”

Section: Optical Microscopy Analysismentioning

confidence: 99%

Electrical conductivity and porosity in stainless steel 316L scaffolds for electrochemical devices fabricated using selective laser sintering

Ibrahim

Brandon

2016

Materials & Design

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Battery electrode microstructures must be porous, to provide a large active surface area to facilitate fast charge transfer kinetics. In this work, we describe how a novel porous electrode scaffold, made from stainless steel 316L powder can be fabricated using selective laser sintering by proper selection of process parameters. Porosity, electrical conductivity and optical microscopy measurements were used to investigate the properties of fabricated samples. Our results show that a laser energy density between 1.50-2.00 J/mm 2 leads to a partial laser sintering mechanism where the powder particles are partially fused together, resulting in the fabrication of electrode scaffolds with 10% or higher porosity. The sample fabricated using 2.00 J/mm 2 energy density (60W -1200 mm/s) exhibited a good electrical conductivity of 1.80 x 10 6 S/m with 15.61% of porosity. Moreover, we have observed the porosity changes across height for the sample fabricated at 60W and 600 mm/s, 5.70% from base and increasing to 7.12% and 9.89% for each 2.5 mm height toward the top surface offering graded properties ideal for electrochemical devices, due to the changing thermal boundary conditions. These highly porous electrode scaffolds can be used as an electrode in electrochemical devices, potentially improving energy density and life cycle.

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Investigation into mechanical and microstructural properties of polypropylene manufactured by selective laser sintering in comparison with injection molding counterparts

Cited by 99 publications

References 37 publications

Solid‐state shear milling method to prepare PA12/boron nitride thermal conductive composite powders and their selective laser sintering 3D‐printing

Solid‐state shear milling method to prepare PA12/boron nitride thermal conductive composite powders and their selective laser sintering 3D‐printing

Microscopic morphology, thermodynamic and mechanical properties of thermoplastic polyurethane fabricated by selective laser sintering

Electrical conductivity and porosity in stainless steel 316L scaffolds for electrochemical devices fabricated using selective laser sintering

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