Physical characteristics of selective laser sintering of metal—polymer powder composites

Ivanova, A. M.; Котова, С. П.; Kupriyanov, N L; Petrov, A L; Tarasova, E. Yu.; Shishkovskii, I. V.

doi:10.1070/qe1998v028n05abeh001240

Cited by 10 publications

(4 citation statements)

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“…The SLS makes it possible to manufacture products with a unique internal and/or external surface shape and perspective physical and mechanical properties [1][2][3][4][5]. At the same time, there are a number of promising polymer powder materials that differ from those traditionally and long used in the technology of SLS-nylon [6,7], polycarbonate [8][9][10][11][12], polyamides [13][14][15][16][17], polyethylenes [18,19], or ferrielectric polyvinylidene fluorides [20] and so onby a combination of high heat resistance, durability, and a wide range of interesting physic-mechanical and chemical-biological properties [21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Design of the SLS-machine for PEEK

Nazarov¹,

Skornyakov²,

Shishkovsky³

2018

Nano Tech Appl

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This paper presents the design of an additive setup for the selective laser sintering (SLS) of high-temperature polymeric materials, which is distinguished by an original control system for aligning the device for depositing layers of polyether ether ketone (PEEK) powder. The kinematic and laser-optical schemes are given. The main cooling circuits are described. The proposed technical and design solutions enable conducting the SLS process in different types of high-temperature polymer powders. The principles of the device adjustment for depositing powder layers based on an integral thermal analysis are disclosed. The PEEK sinterability was shown on the designed installation. The physic-mechanical properties of the tested 3D parts were evaluated in comparison with the known data and showed an acceptable quality.

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Section: Introductionmentioning

confidence: 99%

Design of the SLS-machine for PEEK

Nazarov¹,

Skornyakov²,

Shishkovsky³

2018

Nano Tech Appl

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“…We were among those first who experimentally studied the optical characteristics of polymer systems (PC, PA, etc. ), impregnated with metallic particles [21]. We used an advanced strategy of determination the beam part, which was subjected to absorbing, scattering, and transmission.…”

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confidence: 99%

Laser-Assisted 3D Printing of Functional Graded Structures from Polymer Covered Nanocomposites: A Self-Review

Volyanskii¹,

Shishkovsky²

2016

New Trends in 3D Printing

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Abstract"s a method for conservation of nanoparticles with perspective properties, the threedimensional D printing is a promising technique for modeling, fabricating of functional graded structures FGS with nanoadditives and functional devices. The stabilization of nanoparticles in a polymeric matrix and additionally reinforced porous structure makes it possible to arrange a desired distribution of the nanoparticles in the polymer and thus to protect them from oxidation and corrosion and even to design not only the FGS but also micro/nanoelectromechanical systems M/NEMS devices. The synthesized nanocomposites with controlled porosity and large-specific surface may also find their application in implantation, catalysis, lab-on-chips, drug delivery systems, and D crystalline structures for hydrogen storage devices.

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“…According to the available experimental data [12,13], for the powder systems of interest, heat release from the laser source occurs in a volume, decreasing with distance from the surface in depth (i.e., in the positive direction of the Oy axis) by the exponential law:…”

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confidence: 99%

Modeling of thermal processes in laser sintering of reactive powder compositions

Kholpanov

Zakiev

Shishkovskii

2005

J Eng Phys Thermophys

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A two-dimensional mathematical model describing a combination of the processes of self-propagating hightemperature synthesis and selective laser sintering of powder compositions (it is controlled by the laser-radiation energy) has been proposed. The model makes it possible to evaluate the correspondence of the geometric characteristics of the system to the values of the velocities of a moving laser spot at which the layer poured completely reacts in the vicinity of the spot.Introduction. Selective laser sintering (SLS) is one of the most developed (commercially) procedures of realization of the technology of fast prototyping. The SLS process represents the creation, layer by layer, of material copies of three-dimensional objects using spatially selective laser action on the surface of a freely poured powder composition [1]. A distinguishing feature of the SLS method is the possibility of creating functional composite products, not just their physical models, directly.In our opinion, the development of the SLS method can be the most promising when the SLS process is combined with the well-known process of self-propagating high-temperature synthesis (SHS) [2]. Three-dimensional products created due to the SHS reaction in this case can possess a set of physicomechanical properties that cannot be obtained by other methods. We have shown experimentally the possibility of realizing a controlled SHS combustion reaction in a diffusion regime to form intermetallide and piezo-and ferroelectric phases in the systems Ni-Ti, Ni-Al, Ti-Al [3-5], Pb(Zr x Ti 1−x )O 3 , Li 0.5 Fe 2.5−x Cr x O 4 , and BaFe 12x Cr x O 19 [6,7]. We note that the combination of the SHS and SLS processes is difficult to control. The beginning of the SHS reaction can "anticipate" the process of sintering itself or can "lag" behind it; also, we have the combustion (incomplete burning) of the starting components. The prime objective of laser sintering is precision selection of laser-action regimes in which both processes -SHS and SLSwould be in dynamic equilibrium. Therefore, the large number of controlling parameters in the above processes makes the problem of theoretical modeling topical.The SLS of multicomponent powder compositions is traditionally associated with the process of liquid-phase sintering; this process is well known in powder metallurgy. We note that, even in a one-component powder medium, we always have a variation in the particle size and the early melting of the finely divided part of the fraction is actually analogous to liquid-phase sintering. We know of numerous attempts at modeling the SLS process by the finiteelement method and within the framework of the semiclassical approach in the literature [8][9][10].The present work seeks to construct and investigate a two-dimensional model theoretical description of the SLS of such SHS layers. It should be emphasized that, unlike the SHS macrokinetics, our interest was predominantly with the conditions of preservation of the controllability of the process in question due to the correspondi...

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Physical characteristics of selective laser sintering of metal—polymer powder composites

Cited by 10 publications

References 1 publication

Design of the SLS-machine for PEEK

Design of the SLS-machine for PEEK

Laser-Assisted 3D Printing of Functional Graded Structures from Polymer Covered Nanocomposites: A Self-Review

Modeling of thermal processes in laser sintering of reactive powder compositions

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