Solid Freeform Fabrication Proceedings -1999

Bourell, David L.; Beaman, Joseph J.; Crawford, Richard H.; Marcus, Harris L.; Barlow, J. W.

doi:10.21236/ada377264

Cited by 13 publications

(15 citation statements)

References 15 publications

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“…The use of elongated strips also lends itself well to selective laser sintering, 12 in which laser power variables can be superimposed on compositional paths orthogonally, as shown in Figure 10, in order to judge how much extra laser power is needed for higher fractions of the more refractory component. This allows a binary composition to be meshed with a sintering variable, such as the laser power needed to eliminate porosity, in a single library.…”

Section: Resultsmentioning

confidence: 99%

Device for Preparing Combinatorial Libraries in Powder Metallurgy

Yang

Evans

2004

J. Comb. Chem.

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This paper describes a powder-metering, -mixing, and -dispensing mechanism that can be used as a method for producing large numbers of samples for metallurgical evaluation or electrical or mechanical testing from multicomponent metal and cermet powder systems. It is designed to make use of the same commercial powders that are used in powder metallurgy and, therefore, to produce samples that are faithful to the microstructure of finished products. The particle assemblies produced by the device could be consolidated by die pressing, isostatic pressing, laser sintering, or direct melting. The powder metering valve provides both on/off and flow rate control of dry powders in open capillaries using acoustic vibration. The valve is simple and involves no relative movement, avoiding seizure with fine powders. An orchestra of such valves can be arranged on a building platform to prepare multicomponent combinatorial libraries. As with many combinatorial devices, identification and evaluation of sources of mixing error as a function of sample size is mandatory. Such an analysis is presented.

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Section: Resultsmentioning

confidence: 99%

Device for Preparing Combinatorial Libraries in Powder Metallurgy

Yang

Evans

2004

J. Comb. Chem.

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“…Among SFF techniques, the most promising methods for the production of metal components are the ones that make components by bonding metal powders: laser sintering and 3D printing are the candidates in this category. Selective laser sintering (SLS) [1][2][3][4][5] has been widely studied in the application to metal and alloy powders. In this process, a CO 2 or Nd:YAG laser is usually used as a heat source and selectively scans a powder bed of the powder spread on a flat stage, to join the powder in the designed shape of the cross section.…”

Section: Introductionmentioning

confidence: 99%

Dense P/M Component Produced by Solid Freeform Fabrication (SFF)

et al. 2005

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Using fine metal powders, we were able to fabricate dense P/M (powder metallurgy) products by a three-dimensional inkjet printing system. We used carbonyl nickel powder with a mean particle size of 5 mm as a raw material and examined two binder supply methods: (i) supplying a binder directly from the inkjet head (DB method), and (ii) coating the powder with a water-soluble polymer and then supplying thin polymer-dissolved water from the inkjet head (CB method). The layered green product was sintered in a hydrogen atmosphere at a temperature in the range of 1073-1623 K. Sintered samples fabricated by the CB method had non-uniform microstructure due to agglomeration of the coated powder. In samples made by the DB method, the macroscopic shape was retained after high-temperature sintering at 1623 K, and a high density of over 90% was achieved, which was attributed to uniform powder cohesion in the laminating process.

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“…Recently, they have also been used in direct fabrication of ceramic and metal parts. 5,8,9 Microstereolithography ͑SL͒ derived from conventional stereolithography, provides the unique opportunity of fabricating complex high-aspect ratio 3D microstructures. This SL process successfully demonstrates the fabrication of polymer 3D microstructures.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations on microstereolithography of ceramics

Sun

Zhang

2002

Journal of Applied Physics

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Microstereolithography (μSL) uses laser light to solidify UV-curable resin mixed with concentrated ceramic powders. During the μSL process, the light scattering from the particle suspension is found to significantly influence the fabrication resolution in both lateral and depth dimensions which are critical for the complex three-dimensional (3D) microfabrication. In this work, we performed Monte Carlo simulations and experimental studies to understand the detailed microscale optical scattering, chemical reaction (polymerization), and their influence on critical fabrication parameters. As a result, it was found that due to the scattering, the fabricated line is wider in width and smaller in depth compared with polymeric fabrication at the same condition. The doping technique that we used substantially reduced the light scattering, which in turn enhanced the fabrication precision and control. In addition, the experimental values of curing depth and radius agreed reasonably well with the theoretical modeling. When a laser beam was focused to the diffraction limit, an ultimate linewidth resolution with ceramic μSL was found at about 2.6 μm.

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Solid Freeform Fabrication Proceedings -1999

Cited by 13 publications

References 15 publications

Device for Preparing Combinatorial Libraries in Powder Metallurgy

Device for Preparing Combinatorial Libraries in Powder Metallurgy

Dense P/M Component Produced by Solid Freeform Fabrication (SFF)

Experimental and numerical investigations on microstereolithography of ceramics

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