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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 26 for “"Thermal Spray"”.
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Fabrication of Thermal Management Devices using Thermal Spray Technology
Thermal spray coating processes have been employed to create a composite finned heat sink and a flat vapor chamber featuring structured porous coating wicks, for thermal management application. Three composite heat sinks in the shape of a disk, a cylinder, and a cylinder with vertically projecting …
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Microstructural analysis of thermal spray coatings by electron microscopy
Plasma and High Velocity Oxy-Fuel (HVOF) spraying are two of the most common thermal spray processes. In both methods, heated particles are sprayed through a flame (either plasma or oxygen fuelled), before being projected at high velocity towards a substrate. Upon impact they flatten, forming …
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Erosion-Corrosion of Cr3C2-NiCr High Velocity Thermal Spray Coatings
… mechanisms of erosion-corrosion of Cr3C2-NiCr thermal spray coatings under high temperature, high erodent velocity, turbine conditions. Erosion-corrosion is a generalised wear phenomenon where the combined effect of each degradation mechanism generates more extensive mass loss than the sum of …
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Graded titanium based coatings by combining thermal spray and PVD technologies
There is a rapid growth in demand for improved surface performance in many priority industrial sectors. There have also been rapid developments in methods of surface engineering and in tribological understanding. There is accordingly an exciting opportunity for cost effective industrial …
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Thermal spray of a drug delivery system onto femoral orthopaedic implant
… in chemical composition to bone. Plasma spraying has been commonly used to apply hydroxyapatite coatings onto metallic implants for use in orthopaedic surgeries. The addition of HA coatings was successful in improving the performance of titanium implants. However, this type of implant has …
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Optimizing thermal spray quality verification in FAA repair station specializing in rotating components
Thermal spray is a manufacturing process where melted particles are sprayed onto a surface to build up thickness. It is used extensively in the aerospace industry to improve and repair part surfaces, extending the useful life of expensive components. Because thermal spray is a special process, …
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Electrical Breakdown of Thermal Spray Alumina Ceramic Applied to AlSiC Baseplates Used in Power Module Packaging
Thermal spray coatings offer new alternatives in the production of electronic power modules that use alumina ceramic as an isolation layer. Current processes use direct bond copper (DBC) soldered to a nickel plated copper heat spreader. A coefficient of thermal expansion (CTE) mismatch exists …
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Design and development of a powder mixing device used in the deposition of high velocity oxy-fuel (HVOF) thermal spray functionally graded coatings; Kabir Al Mamun
… Graded Materials (FGMs) is quite difficult, but thermal spray processes like Plasma spray have demonstrated their unique potential in producing graded deposits, where researchers have used twin powder feed systems to mix different proportions of powders. However the HVOF (High Velocity Oxy-Fuel) …
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The erosion of WC-Co coatings
… the TAFA JP5000 and the METCO Diamond Jet (DJ) thermal spray systems.
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The Effect of Substrate Parameters on the Morphology of Thermally Sprayed PEEK Splats
Thermal spray is a well established technology that is commonly used in the aerospace and automotive industries. This thesis reports on the effect that substrate surface chemistry, morphology and temperature has on the morphology of PEEK single splats on aluminium substrates. PEEK single splats …
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A comparative study on wear and corrosion behaviour of tungsten carbide-nickel (Wc-Ni) and tungsten carbide-cobalt (Wc-Co) high velocity oxy-fuel (HVOF) for carbon steel blade
… time. Therefore, high velocity oxy-fuel (HVOF) thermal spray was introduced to protect machine components from wear and corrosion, to restore worn components and to improve the durability of the components. HVOF is one of the process of depositing a material layer over a base metal or substrate …
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Study into mechanical and electrochemical properties of coating deposits and welded-coated components using the HVOF (High Velocity Oxy-Fuel) process.
… properties of High Velocity Oxy-Fuel (HVOF) thermal spray coatings of Inconel 625 powders on plain and welded surfaces of mild carbon and stainless steel (304). The research work carried out focused on coating adherence to base substrate, coating integrity and mechanical behavior of coating …
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Thermal stress analysis of thermally sprayed coatings on a spent nuclear fuel waste package
The purpose of applying a thermal sprayed coating on a spent nuclear fuel waste package is to prevent moisture contacting the spent nuclear fuel for tens of thousands of years. This thesis studies some of the thermal effects that a coated waste package may experience. Residual stress from the …
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Supersonic Laser Deposition and LaserForge: Process Mechanism Coating Characteristics
… that can be used as an alternative to existing thermal spray processes. It has the benefit of low temperature, allowing the deposition of nanostructured and temperature sensitive coatings, which is not currently possible with existing thermal spray. This main aim of this work was to undertake an …
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Design of experiment analysis of high velocity oxy-fuel coating of hydroxyapatite
… effectiveness the high velocity oxy-fuel (HVOF) thermal spray process has been widely adopted by many industries. Though there are different types of flame spraying processes, the HVOF thermal spray process utilises only powder as the coating material rather than wire or rod. Carbon-hydrogen …
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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 for …
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Optimisation of plasma sprayed hydroxyapatite coatings
… the uncemented fixation of implants. The plasma spraying technique, a thermal spray process, is the most commonly used method for the production of HA coatings. This process is a complicated one, affected by a large number of parameters. Due to this complexity, the process – property – structure …
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Study of the effect of molten CuCl immersion test on alloys with high Ni-content with and without surface coatings
… coatings were applied to the base metal using thermal spray methods. An immersion apparatus was designed and constructed to perform an immersion test that has a condition similar to those in a hydrogen plant. After the immersion test, the materials were evaluated using an electrochemical method …
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Solid oxide fuel cell electrolytes produced via very low pressure suspension plasma spray and electrophoretic deposition
… electrical energy. Both very low pressure plasma spray and electrophoretic deposition allow working with high melting temperature SOFC suspension based feedstock on complex surfaces, such as in non-planar SOFC designs. Dense, thin electrolytes of ideal composition for SOFCs can be fabricated with …
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NOVEL NANOMATERIALS FOR ENERGY RELATED APPLICATIONS
… superior corrosion resistance properties of HVOF thermal spray of TiC and TiB2 coatings on 304H stainless steel, 430, and P91 steels were reported. The coatings successfully served at a protection layer by limiting oxygen penetration, sulfur attack, and decreased the formation of pits and cracks …
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