Global ETD Search
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 19 of 19 for “"Cold spray"”.
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Using cold spray to package electronic implants
… manufacturing steps. This thesis explores cold spray as an alternative packaging method that would address the issues associated with traditional packaging. Cold spray could be used to create conformal packaging around electronic implants. Two biocompatible packaging materials, ultra high …
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Evaluation of Cold Spray Process for Solid-State Welding
… areas. To address this problem, the expansion of cold spray process—a solid-state layer-by-layer high speed particle deposition process—as an alternative solid-state welding technique is proposed, developed, and evaluated, a process referred to as cold spray welding (CSW). As a starting point, the …
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Finding the edge: Net-shape surface sculpting during cold spray deposition
… of how a successful method for structuring cold spray deposition was developed, allowing the creation of defined surfaces from a previously uncontrolled deposition profile. When considering both additive and traditional manufacturing techniques, there remains a gap in the market for a high …
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Vliv mikroobrábění povrchu na adhezní pevnost nástřiků připravených technologií cold spray
… na adhezní pevnost nástřiků nanesených metodou cold spray. Tvrdost substrátu v této technologii hraje klíčovou roli, zejména u tvrdých materiálů, kde je obtížné dosáhnout dostatečné přilnavosti povlaku. Cílem práce bylo zjistit, zda předpříprava povrchu zlepší adhezní vlastnosti substrátu oproti …
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Evaluación numérica, construcción y verificación experimental de Tobera de Laval para Cold Spray
… de nuevos procesos de manufactura, el proceso de Cold Spray toma un peculiar interés. Este corresponde a un proceso de aspersión térmica, en el cual partículas metálicas son proyectadas en un flujo supersónico, las cuales, al contacto con un sustrato, se adhieren a este mediante deformación …
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Processing-microstructure-property relations in high pressure cold spray of AA2024 and AA7075
… relations are examined for cold spray deposited AA2024 and AA7075. Unlike traditional thermal spray technologies, powders are never melted during the cold spray process. This approach allows for heat-sensitive materials such as 2000 and 7000 series aluminum alloys to be used …
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A Numerical Study of Supersonic Rectangular Jet Impingement and Applications to Cold Spray Technology
… impinging on a flat surface are of interest to cold gas-dynamic spray technology. Solid particles are propelled to a high velocity through a convergent-divergent nozzle, and upon impact on a substrate surface, they undergo plastic deformation and adhere to the surface. For given particle and …
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Simulación computacional y medición experimental de dureza de un recubrimiento de aluminio producido por cold spray
Cold spray es una técnica de deposición de material en donde partículas impactan a altas velocidades sobre un sustrato con el objetivo de generar un recubrimiento para refuerzo o reparación de superficies, para aplicaciones en la industria aeroespacial principalmente. Dada la escala nanotemporal …
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Advancing Cold Spray for Additive Manufacturing: A Study on Particle Morphology, Gas Nature, and Particle Preheating
… and improve the deposition quality and rates of cold spray for additive manufacturing in a way that is economically sound and without the detrimental temperature effects seen in traditional metallic additive manufacturing processes. It focuses on materials that are desired by the additive …
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Process-Microstructure-Property Relationships of High-Pressure Cold Spray Deposition of Aa7050 After in Situ Laser Heat Treatment
… is to develop and characterize high-pressure cold sprayed AA7050 after in situ laser heat treatment. Successfully cold sprayed aluminum alloys with a low porosity promotes the idea to apply the cold spray technique from dimensional restoration to load-bearing structural repair. Recent …
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High-Velocity Impact of Metal Microparticles
… This research speaks directly to the cold spray additive manufacturing method, in which a stream of solid metal particles is impacted onto a surface to deposit metal coatings. The physics that control the upper and lower bounds of the velocity window over which cold spray can occur are …
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Synthesis and Characterization of Aluminum-Carbon Nanotube Composite by Cryogenic Milling
… for bulk powder processing to be used in cold spray. Al-CNT metal matrix composite powders with 5 wt.% and 10 wt.% CNT were synthesized by cryogenic milling of the blended component powders. Stearic acid was used as a process control agent to minimize agglomeration of the powders upon …
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COLD SPRAYED COATINGS WITH DUAL NANOPARTICLE REINFORCEMENTS FOR WEAR AND CORROSION PROTECTION
As a form of additive manufacturing, the use of cold spray has made significant strides since different-sized particles were explored in the process. There is proof that micron-sized particles down to nanoparticles enhance the mechanical material properties of a substrate in wear resistance. …
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Grain Boundary Pinning Approach for Manufacturing High-Strength Nanocrystalline Aluminum Alloys
… methods (a) spark plasma sintering and (b) cold spray processes. The mechanical properties of the bulk samples were assessed by conducting Vickers microhardness, tensile, and fatigue tests. The tests were performed both at the University's laboratory and at an independent testing facility. …
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Quantifying Plasticity and Temperature in High Velocity Microparticle Impacts
… to study phenomena in mechanical behavior, cold spray, and astronomical impacts, all of which will be further investigated in this work. This thesis combines LIPIT experiments and finite element modeling to explore the dynamic behavior of pure metals in the unique regime of strain, strain …
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Fragmentation and reaction of structural energetic materials
… using explosive compaction or the gas dynamic cold spray process. Fragment size distributions of the indicated metal+Al systems were explored; mean fragment sizes were found to be smaller than those from homogeneous ductile metals at comparable strain rates, posing a reduced risk to innocent …
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Understanding the Structure-property Relationships of Solid-state Additively Manufactured Stainless-steel Coatings
… As a method to mitigate these handicaps, cold spray additive manufacturing (CSAM, or more frequently referred to as cold spray (CS)) has proved to be a reliable tool to form protective coatings and repair these components, ultimately prolonging their lifespans. However, these components …
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Assessing and Enhancing Seawater Corrosion Performance of Aluminum Alloy 7075 and 2024 Additive Repairs Produced by Cold Gas Dynamic Spray Deposition
… is to investigate the corrosion behavior of cold sprayed (CS) aluminum alloys 2024 and 7075 in an immersed seawater environment, and improve understanding of CS processing-microstructure-corrosion property relationships. As a low temperature additive spray technique, CS has an attractive …