Selective laser sintering of HIPS and investment casting technology

Yang, Jinsong; Shi, Yusheng; Shen, Qinglin; Yan, Chunze

doi:10.1016/j.jmatprotec.2008.04.056

Cited by 54 publications

(33 citation statements)

References 18 publications

(16 reference statements)

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“…Therefore, thermal properties of materials are of particular important factors determining the SLS processing parameters and part properties. Several amorphous polymers have been successfully used as SLS materials, such as polycarbonate (PC) (Childs et al, 1999;Ho et al, 1999;2002;Fan et al, 2005;Shi et al, 2007), polystyrene (PS) (Shi et al, 2004;Zheng et al, 2006), high impact polystyrene (HIPS) (Shi et al, 2008;Yang et al, 2009) and styrene-acrylonitrile copolymer (Yan et al, 2010). Ho et al (1999;2002;) did many works in exploring to make PC function plastic parts via SLS.…”

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confidence: 99%

Investigation into the Differences in the Selective Laser Sintering between Amorphous and Semi-crystalline Polymers

Yan

Shi

Hao

2011

International Polymer Processing

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Significant different thermal properties between amorphous and semi-crystalline polymers have a great effect on the selection of proper sintering parameters and the resulting properties of the parts made by selective laser sintering (SLS) process. This paper studied the differences in the part bed temperature (T b ), and relative density, tensile strength and dimensional accuracy of the SLS fabricated parts between semicrystalline and amorphous polymers, by measuring and comparing the laser sintering properties of polystyrene (PS), a typical amorphous polymer, and nylon-12 (PA12), a typical semicrystalline polymer. The results show that: the part bed temperatures (T b ) of amorphous polymers and semi-crystalline polymers should be kept close to glass transition temperature (T g ) and initial melting temperature (T im ) respectively, which can be measured by differential scanning calorimetry (DSC), and this rule combined with trial and error experiments can determine T b of a polymer in the SLS process; the amorphous polymer SLS parts have very low relative densities and much lower tensile strengths than the strengths of their fully dense forms, while the semi-crystalline polymer SLS parts have higher relative densities and their tensile strengths are close to the strengths of their fully dense forms; the dimensional accuracy of the SLS parts of amorphous polymers is higher than that of semi-crystalline polymer SLS parts at the same processing parameters. The obtained results will be helpful for the development of new SLS materials and the setting of processing parameters.International Polymer Processing downloaded from www.hanser-elibrary.com by Kungliga Tekniska on August 20, 2015For personal use only.

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confidence: 99%

Investigation into the Differences in the Selective Laser Sintering between Amorphous and Semi-crystalline Polymers

Yan

Shi

Hao

2011

International Polymer Processing

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“…The reasonable liner energy ranging from 10 J/m to 20 J/m was obtained for laser sintering the 2%PF/silica sand composite powder, and the PF coating was carbonized with the line energy over 20 J/m. (2). The shrinkage depth of the powder bed first quickly enhances then gradually falls with the increase of the line energy after 20 J/m.…”

Section: Discussionmentioning

confidence: 96%

“…In the direct process, single powder is directly sintered into final parts and no post process is needed. This method is extensively used to sinter the polymer [1][2][3], metal [4,5] even ceramic [6]. Up to date, direct sintering of polymers has been maturely applied for their lower melting temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Up to date, direct sintering of polymers has been maturely applied for their lower melting temperature. Several kinds of polymers such as polycarbonate (PC) [1], polystyrene (PS) [2] and polyamide (PA) [3] have been widely employed as the SLS materials. While direct sintering of metals is still an infant, although metallic materials like low-carbon steel, copper, titanium, superalloy, etc.…”

Section: Introductionmentioning

confidence: 99%

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Processing and characterizations of 2%PF/silica sand core–shell composite powders by selective laser sintering with a higher transmittance fiber laser

Liu¹,

Zhao²,

Zhang³

et al. 2012

International Journal of Machine Tools and Manufacture

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“…The laser sintering process allows complex 3D objects to be built by selectively fusing together successive layers of powdered material. Theoretically, the wide range of material choices is a major advantage of SLS technology, because any powder that can be bonded after heating can be applied in SLS technology, but in practical applications, powder materials that can be successfully used are scarce [3][4][5][6][7][8]. The main reason for this scarcity is that SLS technology requires high-performance powder materials.…”

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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Selective laser sintering of HIPS and investment casting technology

Cited by 54 publications

References 18 publications

Investigation into the Differences in the Selective Laser Sintering between Amorphous and Semi-crystalline Polymers

Investigation into the Differences in the Selective Laser Sintering between Amorphous and Semi-crystalline Polymers

Processing and characterizations of 2%PF/silica sand core–shell composite powders by selective laser sintering with a higher transmittance fiber laser

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

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