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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"Metal powder"”.
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Ignition of metal powder by electrostatic discharge stimulation
Energetic formulations with metal fuel additives are extensively used in propellants, explosives, pyrotechnics, and incendiaries. Currently, replacement of regular metal powders with nanocomposite metal-based materials is being considered. Such nanocomposite reactive materials are capable of very …
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Experimental yield surface studies for the compaction of metal powder
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1993.
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Study of the heating and ignition of metal powder by electrostatic discharge
… that lead to ESD stimulated ignition events in metal powders. Several metals were studied: Mg, Al, and Ti. A commercially available ESD test device was adapted for the present experiments. The ESD current and voltage were measured using inductance coils; the data were used to determine the …
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Sustainable Spacefaring: Exploration of scrap metal powder metallurgy on the lunar surface
… opportunities and limitations of upcycling scrap metal from Low Earth Orbit (LEO) as Additive Manufacturing (AM) feedstock for the lunar surface with the goal of exploring the lunar architectural surface needs for a powder metallurgy processing facility and recommend areas of improvement for the …
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Characterization and consolidation of a high temperature aluminum transition metal powder alloy
A gas atomized powder Al-TM alloy containing approximately 12 weight percent total iron, chromium, plus titanium alloy addition was consolidated by direct extrusion and friction stir extrusion, with promising thermal stability and elevated temperature properties. Previous work focused on production …
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Heat transfer model for the ignition of metal powder on a heated filament
The thermal processes leading to ignition of metal powders in environments that experience rapid temperature changes are currently poorly understood. In this research, a methodology for studying and quantification of such processes is developed. In the experimental case study, the ignition …
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A new constitutive model for the finite element analysis of metal powder compaction
During the commercial compaction of metal powder in a punch-die setup and the subsequent sintering of the compacted preform, the large confining pressures, friction and heat that arise determine the properties of the final component. An important application of the modelling of metal powder …
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High solid loading aqueous base metal/ceramic feedstock for injection molding
Increasing volume fraction of metal powder in feedstock provided lower shrinkage. Reduction of the shrinkage results in better dimensional precision. The rheology of the feedstock material plays an important role to allowing larger volume fractions of the metal powder to be incorporated in the …
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Layer-to-Layer Feedback Control for Direct Energy Deposition Additive Manufacturing
… specifically, direct energy deposition (DED) of metal powders is a process capable of producing and repairing parts with complex geometries; however, it is not widely used in industry due to challenges with quality control. In this process, metal powder is dispensed from a nozzle and a laser beam …
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CFD Modeling of nanoparticle formation in a plasma synthesis reactor
The present work reports on the simulation of metal powder formation in a Inductively Coupled Plasma reactor. A carrier gas transports the metal powder into the reactor in where it attains the vapor phase. The products are recovered after a quenching process. The model accounts for particle …
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High green density metal parts by vibrational compaction of dry powder in three dimensional printing process
… material properties and dimensional accuracy of metal tooling produced by the Three Dimensional Printing process can be enhanced by increasing the green density of the 3D printed part. Green density is the ratio of metal powder volume to the external volume of the printed part, and is a measure …
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Feasibility study on producing functional parts using molding technology
… (acrylonitrile butadiene styrene) filled with metal powder have been studied. Copper powder having different percentage was used as fillers. Polymer composite investigated to produce high electrical conductivity from a low-cost thermoplastic with low conductive filler loading concern over the …
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Modelling material behavior for additively manufactured metals and polymers produced by fused filament fabrication
… that builds the product layer by layer. Metal Fused Filament Fabrication (MFFF) employs a filament composed of metal powder and a polymer binder. The MFFF process involves three key stages: printing, debinding, and sintering. Despite its numerous benefits, MFFF confronts particular …
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A model kit : a system for constructing three-dimensional interactive graphic models
… robots. the human eye, microscopic views of a metal powder, and cross-sections of a brain. The interactive models made with this kit can be saved, redisplayed and rebuilt
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Tailoring Mechanical Properties and Porosity in Laser Powder Bed Fusion by Spatial Manipulation of Feedstock Composition
… than many conventional manufacturing processes. Metal AM has revolutionized the design and production of rocket engines, enabled lightweight robotics and drones, and created heat exchangers that improve the efficiency of energy conversion systems. Typically, the feedstock for metal AM is a single …
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The Progressive Regeneration of a Traditional Production Plant
… process of mixing and mould filling of metal powder/diamond mixture was studied and a new method of pelletisation was developed and introduced. The machine capability of the Company was analysed and the selection of a CNC turning centre was undertaken. This machine was purchased, …
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A precision blade mechanism for powder recoating in Selective Laser Melting
… viable means of additively manufacturing metal components with complex geometries from a wide variety of alloys. In this process, a metal powder is spread onto a build surface in a thin layer, and then the powder is selectively melted to form a cross-sectional slice of the part. This …
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Investigation of effect of process parameters on multilayer builds by direct metal deposition
… fabricated by creating a molten pool into which metal powder is injected as. During fabrication, complex thermal activity occurs in different regions of the build; for example, newly deposited layers will reheat previously deposited layers. The objective of this study was to provide insight into …
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Fabrication of 316L stainless steel (SS316L) foam via powder compaction method
Metal foam is the cellular structures that made from metal and have pores in their structures. Metal foam also known as the porous metals, which express that the structure has a large volume of porosities with the value of up to 0.98 or 0.99. Porous 316L stainless steel was fabricated by powder …
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