Selective Laser Sintering Of Single‐ And Two‐component Metal Powders

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Computational Tools for 3D Printing

Selective Laser Sintering (SLS) Direct Metal Laser Sintering (DMLS) SLS and DMLS use a bed of small particles (made of plastic, metal, ceramic, or glass) High-power laser traces one layer on the surface of the powder bed melting/fusing the particles The platform descends by one layer and more material is added

Computational Tools for 3D Printing

Selective Laser Sintering (SLS) Direct Metal Laser Sintering (DMLS) SLS and DMLS use a bed of small particles (made of plastic, metal, ceramic, or glass) High-power laser traces one layer on the surface of the powder bed melting/fusing the particles The platform descends by one layer and more material is added

Abstract Polyamide microcapsules and method to produce the same

by selective laser sintering. This document does not consider the production or applications of polyamide microparticles obtained by AAROP that comprise seeds of other inorganic materials´ powders and, therefore, suffers of the same limitations indicated in the aforementioned patents.

SOLID-LIQUID-VAPOR PHASE CHANGE OF A SUBCOOLED METAL POWDER

solution of melting and resolidification of a two-component metal powder subjected to temporal Gaussian heat flux was obtained by Konrad et al. [7]. Another approach to minimize the balling effect is to use a pulsed laser to effectively decrease life span of the liquid and thus to avoid the balling effect. Pulsed

Consolidation phenomena in laser and powder-bed based layered

products (RM). Laser and powder bed based manufacturing (i.e. selective laser sintering/melting or its variants) holds a special place within the variety of LM processes: no other LM techniques allow processing polymers, metals, ceramics as well as many types of composites. To do so, however, quite some different powder

Three-Dimensional Modeling of Selective Laser Sintering of

Selective Laser Sintering of Two-Component Metal Powder Layers Laser sintering of a metal powder mixture that contains two kinds of metal powders with significantly different melting points under a moving Gaussian laser beam is investigated numerically. The continuous-wave laser-induced melting accompanied by shrinkage and

CERAMICS: GETTING INTO THE 2000's - GBV

Exploiting the rheology of metal oxides in colloidal processing G.V Franks, D.V. Boger 623 Colloidal processing of two-component powder systems Y Hirata, Wei-Heng Shih : 637 Gelation forming process of ceramic compacts by agarose Z.R Xie, J.L Yang, D. Huang, YL Chen, Y Huang 645 SECTION E SINTERING SCIENCE AND TECHNOLOGY

Additive Manufacturing of Glass

SLS process of two-component metal powders by FVM [42,43]. An FEM and FVM coupled model, which can predict laser weld-ing geometry formation and joint strength, was created by Mari-muthu et al. [44]. Jamshidinia et al. [45] and Mahamood et al. [46] also modeled melting process of metal powder by FVM. In

THERMAL MODELING OF METAL POWDER-BASED SELECTIVE LASER

In order to get a better understanding of Selective Laser Sintering (SLS) process of the metal powders, three-dimensional modeling of laser sintering of a metal powder mixture that contains two kinds of metal powder with significantly different melting points under a moving Gaussian laser beam is investigated numerically.

Chapter 09171 - Laser-Based 3D Printing and Surface Texturing

The materials used for building components in SLS machines can be single component powders (such as metal powders produced by ball milling) or, more commonly two-component powders, coated powders or powder mixtures. Compared to other Figure 1 SLA design, as described in the original C.W. Hull patent.

ANALYSIS OF HEAT TRANSFER IN SUBCOOLED METAL POWDER SUBJECTED

Selective Laser Sintering (SLS) is an emerging technology that can build structurally-sound parts from powdered material via layer-by-layer sintering (for amorphous powder, such as polycarbonate) or melting (for crystalline powder, such as metal) induced by a directed laser beam. Fabrication of metal parts is a very challenging task since the

Laser sintering of metal powders on sintered layers

Jun 05, 2019 formed by selectively sintering metal powders under a high-energy laser beam. The laser beam scans a selective area, melts and consolidates thin tracks of powder as it moves away. After completion, the whole powder bed is lowered and a fresh powder layer is spread to the build zone. The sintering pro-cess is repeated until the final part is

DDMC 2016 : Fraunhofer Direct Digital Manufacturing

From PowderstoMetalPartsThrough Selective LaserMelting: Comparison ofSeveralCommercialAl-12Si Alloy Powders 53 Olivier Dellea1, Philippe Berne1, Maria Averyanova2, Romain Soulas1, Pascal Revirand1,

Analysis of melting of alloy powder bed with constant heat flux

rapid melting of a subcooled single-component metal pow-der bed in the SLS process. Under irradiation of a pulse laser beam, the surface of the powder particle is molten first and the core of the particle remains solid. Melting in SLS of single-component metal powder was modeled as melting occurring in a range of temperature with significant

Two-Dimensional Modeling of Sintering of a Two-Component

The balling phenomenon can be avoided by using a two-component powder system that contains two types of metal powders possessing significantly different melting points [4, 5]. During the SLS process, only low melting point metal powder goes though melting and resolidification while the high melting point metal powder remains solid in the process.

1) Introduction to 3D Printing - Education

Some SLS machines use single-component powder, such as direct metal laser sintering. However, most SLS machines use two-component powders, typically either coated powder or a powder mixture. In single-component powders, the laser melts only the outer surface of the

Selective Laser Sintering of Calcium Polyphosphate: Finite

Keywords: selective laser sintering, liquid phase sintering, calcium polyphosphate, porosity, heat affected zone 1. Introduction Selective laser sintering (SLS) enables the manufacturing of parts from powdered material by selectively heating and fusing of powder particles using a laser beam [1]. To realize the fabrication of complex-

Influence of Particle Size on Laser Absorption and Scanning

of single/two-component powders measured by a sphere integrator, and the numerical wave of metal powder absorptivity during laser processing. Use of the integrating sphere method to measure transmitted and reflected irradiation from powder layers and to estimate the attenuation coefficients has been proposed by McVey et al. [21].

A multiscale nonequilibrium model for melting of metal powder

Selective laser sintering (SLS) is a rapid prototyping and additive manufacturing technology that creates three-dimensional freeform and nearly full-density parts via layer-by-layer sintering or melting of metal powders induced by a directed laser beam [1-5].

3D FINITE ELEMENT ANALYSIS IN THE SELECTIVE LASER MELTING PROCESS

Key Words: Rapid Prototyping, Selective Laser Melting, FEM, Metal Powders 1. INTRODUCTION Selective Laser Sintering (SLS) was developed by Carl Deckard at the University of Texas at Austin, USA in 1987 for making plastic prototypes. In 1992, DTM Corporation (Texas, USA) introduced the Sinterstation™ machine for SLS [1].

Rapid prototyping - KSU

Some SLS machines use single-component powder, such as direct metal laser sintering. However, most SLS machines use two-component powders, typically either coated powder or a powder mixture. In single-component powders, the laser melts only the outer surface of the particles

SLS- The Selective Laser Sintering

SLS- The Selective Laser Sintering Applications Visual prototypes of complex space-frame designs, thin walled structures, or structures with significant overhangs. Functional prototypes especially plastic parts with high demands on mechanical and thermal properties. Functional prototypes of plastic parts with low weight (density ~0

Studies on thermoplastic 3D printing of steel zirconia composites

Selective laser sintering (SLS) is an AM process that uses powder materials. SLS was tested for a number of ceramic materials.9 13 Laser sintering has an exceptional position as the ceramic material can be directly sintered during the AM process. However, ceramic materials that are sintered by a solid-state sintering process cannot be

Advances in Thermal Modeling of Selective Laser Sintering of

Abstract Selective laser sintering (SLS) of single component metal powders is a rapid prototyping technology in which a high-energy laser beam scans, melts, shrinks and consolidates metal powders with single component. For better understanding physical mechanisms during laser sintering of single-component metal particles, a temperature

WHITE PAPER Guide to Selective Laser Sintering (SLS) 3D Printing

commonly used version for selective laser sintering is nylon 12 (PA12). SLS NYLON 12 MATERIAL PROPERTIES Tensile Strength 50 MPa Elongation at Break 6-11% Heat Deflection Temperature (HDT) @ 0 45 MPa 171 °C Nylon 12 is a single-component powder, but some SLS 3D printers can also use two-component powders, such as coated powders or powder

Additive Manufacturing - Carnegie Mellon University

Selective Laser Sintering (SLS) Direct Metal Laser Sintering (DMLS) SLS and DMLS use a bed of small particles (made of plastic, metal, ceramic, or glass) High-power laser traces one layer on the surface of the powder bed melting/fusing the particles The platform descends by one layer and more material is added

Title: Fundamental Models of Selective Laser Sintering of

with Selective Laser Sintering (SLS) of single- and two-component metal powders, as well as post-processing of the sintered parts with liquid metal infiltration. 3.1 Absorptivity of Laser Radiation by Metal Powders Any model for laser processing of materials must have a complete description of the coupling

Simulation of Transient Temperature Field in the Selective

technology [1]. Direct metal laser sintering (DMLS) is a method of rapid prototyping and manufacturing (RP&M) which three-dimensional parts are formed directly from metal powders. It includes three major materials such as single-component metal powder, multi-component metal powder and pre-alloyed powder. Multi-component

Melting and resolidification of a subcooled metal powder

ter metal powders. One advantage of pulsed laser sintering is that it can minimize the balling effect by decreasing the life span of the melt pool. Abe et al. [19] studied SLS of titanium powders using a YAG laser with pulse widths ranging from 1 to 5 ms and an average power of 50 W. Su et al. [20] investigated fully dense laser sintering of tool