The Effect of Polyamide Particles on the Processibility of Selective Laser Sintering

Lim, Byung-Seok; Kim, Hyung-Il; Kim, Dong-Soo; Bang, Young-Kil

doi:10.1142/s0217979208047481

Cited by 4 publications

(18 citation statements)

References 5 publications

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“…The range of the laser radiation power was selected from 20 to 70 mW. The rate of moving the laser spot was selected from 1 to 10 mm s – . Prior experiments have determined that one passage of the laser spot was not enough to design the stable structure in all of the range of the parameters under investigation.…”

Section: Resultsmentioning

confidence: 99%

“…It was determined, using the obtained values of the width of the central area of the photopolymerized line, that the filling density at least 15 lines per mm should be used to fill 100% of the layer at the laser beam rate beginning with 10 mm s – . All of this permits one to fill up a whole layer of a form under testing with the photo‐cured lines that overlap a little from ones to tens μm.…”

Section: Resultsmentioning

confidence: 99%

“…A work area of 40 × 40 mm 2 was used in the experiments. A maximum scanning speed was up to 100 mm s – .…”

Section: Methodsmentioning

confidence: 99%

“…The distribution maps of the effective Young's modulus on the samples surface were defined using a PIUMA Nanoindenter (Optics11, Amsterdam, the Netherlands) measuring setup with supplied software. To study a sample, a probe with the tip radius of 30 μm, which was attached to a cantilever with the hardness of 52.4 N m – , was used. All of the measurements were conducted in air at 20 °С.…”

Section: Preparation and Work Steps With ррс For Forming The 3d‐strucmentioning

confidence: 99%

See 3 more Smart Citations

UV‐laser formation of 3D structures based on thermally stable heterochain polymers

Dudova

Bardakova

Kholkhoev

et al. 2018

J of Applied Polymer Sci

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A new approach to making a photopolymeric composition was first elaborated in this work based on the use of poly‐N,N′‐(m‐phenylene)isophtalamide as the heterochain polymer matrix together with 4,4′‐diphenyl oxide diacrylamide as the crosslinking agent. Reproducible three‐dimensional (3D) objects have been formed using a laser stereolithograph completed with a laser with wavelength of 405 nm. According to the thermogravimetric analysis, the thermal stability of the formed objects could be changed through a control from 260 to 405 °C. Moreover, it was proven that the tensile strength of samples of the crosslinked films reached 90.1 ± 3.2 MPa at the elongation at break of 12.4 ± 2.3%, depending on the forming parameters of such samples. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46463.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…A work area of 40 × 40 mm 2 was used in the experiments. A maximum scanning speed was up to 100 mm s – .…”

Section: Methodsmentioning

confidence: 99%

Section: Preparation and Work Steps With ррс For Forming The 3d‐strucmentioning

confidence: 99%

See 2 more Smart Citations

UV‐laser formation of 3D structures based on thermally stable heterochain polymers

Dudova

Bardakova

Kholkhoev

et al. 2018

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…For example, in order to create molded parts with good dimensional accuracy and mechanical strength, the resin material used to prepare the powder should have an appropriate melting point, high thermal stability, small shrinkage rate, and suitable melt viscosity. Furthermore, the prepared powder particles should have approximately spherical structures with diameters of 20-80 µm, permitting greater powder fluidity and higher bulk density [9,10]. Polyamide-12 (PA12)-based powder is one of the only materials used for SLS technology because it has good dimensional stability, a low melting point, easy processing, and a small shrinkage rate [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of novel PA6/SiO2 composite microsphere applied for selective laser sintering

Wang¹,

Liu²,

Zhang³

et al. 2018

Express Polym. Lett.

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Abstract. The high cost and less variety of raw materials has greatly restricted the wide application of selective laser sintering (SLS) technology. In order to make the material cheaper and more diverse, PA6 is the most preferable material. In this work, a new PA6/SiO 2 composite microsphere used for SLS was designed and fabricated. To construct the material, PA6 porous microspheres with diameters of 20-80 µm and a certain pore volume were firstly prepared by the dissolution precipitation method. Then, SiO 2 was generated in situ in the PA6 porous microsphere framework, thus achieving a special structured PA6/SiO 2 composite microsphere. These microspheres with much well dispersed SiO 2 in PA6 matrices formed a powder with high bulk density and good electron conductivity. The particle size and weight fraction of the two components can be well controlled by adjusting the experimental conditions. Differential scanning calorimetry (DSC) data showed that the composite powder had a larger sintering window, which would be beneficial for SLS processing. The introduction of SiO 2 reduced the rate of water absorption in the composite powder, which could improve the accuracy of SLS forming. This work has certain significance as a reference for the design and development of SLS polymer-based composite materials.

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Additive manufacturing of PA12 carbon nanotube composites with a novel laser polymer deposition process

Wencke

Kutlu

Seefeldt

et al. 2020

J of Applied Polymer Sci

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The facile manufacture of PA12 MWCNT/silica (50/50 by weight) nanocomposite powders through a high energy mixing process is presented, which are useful to generate 3D objects by a novel Laser Polymer Deposition (LPD) process. The mixing as well as the LPD process led to no discernible changes in the material properties (DSC, SEM, LD) of the core‐shell nanocomposites, enabling the recycling of unconverted powder. The built parts yield ultimate tensile stresses and Young's modulus at 10%–20% of the bulk material. Partially unmolten particles and voids were identified as the main mechanical failure mechanism in the built parts. The mechanical properties are better with low additive content (Young's modulus: 89.8 ± 5.4 MPa; UTS: 12.9 ± 5.3 MPa with 0.25 wt% additives). Electronic conductivity up to the region of moderate conductivity could be achieved by multiwalled carbon nanotube (MWCNT) network formation (8 × 10−4 S cm−1 at 1.25 wt% of additives). A variant of the processing strategy revealed that a higher mechanical strength can be achieved by a laser induced remelting of the traces following their initial construction.

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The Effect of Polyamide Particles on the Processibility of Selective Laser Sintering

Cited by 4 publications

References 5 publications

UV‐laser formation of 3D structures based on thermally stable heterochain polymers

UV‐laser formation of 3D structures based on thermally stable heterochain polymers

Preparation and characterization of novel PA6/SiO2 composite microsphere applied for selective laser sintering

Additive manufacturing of PA12 carbon nanotube composites with a novel laser polymer deposition process

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