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 13 of 13 for “"Ceramic Substrate"”.
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The Role of residual stresses in ceramic substrate materials for hybrid thick film applications
… is used to measure residual stresses in the ceramic substrate as well as metallization of wideband coplanar thick film probes. The probes are also tested for electrical performance using Time Domain Reflectometry (TDR) technique. This thesis presents results that indicate that significant …
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Microstructural studies of vapor-deposited nickel/ceramic composites
… program examines fundamental aspects of metal/ceramic interactions through the analysis of model composites produced by plasma-assisted physical vapor deposition (ion plating) and consisting of thin ($<$1 micrometer) metallic films on a ceramic substrate. The two major aspects of this research …
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Residual stress in Pt coatings under thermal influence
… consists of a thin metallic film deposited on a ceramic substrate. In this work, commercially manufactured Pt-Al₂O₃ composites annealed at 0°C, 300°C, 600°C and 1170°C above room temperature were investigated for residual stress using the non-destructive X-ray diffraction technique. The apparatus …
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Wideband characterization of thick film inductors
… the spiral conductor is printed directly on the ceramic substrate, the spiral is printed on a ferrite layer, the spiral is printed on the substrate with the ferrite layer on top, and finally, two interconnected spiral layers sandwiching ferrite (or dielectric) layers.
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Development of a low-cost, rapid-cycle hot embossing system for microscale parts
… Innovative design aspects include the use of new ceramic substrate heaters for electrical heating, use of a moveable heat sink to minimize heat load during the heating cycle, and the careful design of the thermal elements to minimize the heating and cooling cycle times. The capital cost and the …
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Reliability Evaluation of Large-Area Sintered Direct Bonded Aluminum Substrates for Medium-Voltage Power Modules
… task, analysis and characterization of the metal-ceramic substrate and its structure is performed. First, finite element models are created to evaluate the fatigue behavior of the large area bonds in the substrate structure. Prototypes of these multi-layer substrates have also been fabricated and …
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Characterizing ash properties and effects on Diesel Particulate Filter flow resistance
… efficiency and relative simplicity. The porous ceramic substrate captures the particulate matter which is comprised of combustible soot and inorganic metallic ash. While the soot can be cleared from the filter through high temperature oxidation, the small amount of ash remains in the filter. The …
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Design and Validation of a High-Density 10 kV Silicon Carbide MOSFET Power Module with Reduced Electric Field Strength and Integrated Common-Mode Screen
… strength at the triple point of the insulating ceramic substrate. Further, field-grading plates are used in the bus bar to reduce the electric field strength at the module terminations. The heat flux is addressed by employing direct-substrate, jet-impingement cooling. The cooler is integrated …
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Realizzazione di riporti funzionalizzanti su superfici ceramiche per la produzione di energia elettrica mediante effetto fotovoltaico
… with different functionality, deposited on a ceramic substrate, to obtain photovoltaic cells for electricity production. The research activities are included in the project PRRIITT, Measure 4 (Development of Networks), Action A (Research and Technology Transfer Laboratories), Thematic …
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Switchmode Power Supply Miniaturization with Emphasis on Integrated Passive Components on Prefired High Performance Ceramic Substrates
… This research addresses high performance ceramic, passive component integration. Three key issues; electrical characterization, thermal analysis and simulation, and material characterization, are examined in this work. Thick film passive components (capacitors and resistors) on AlN have …
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Mechanics driven architectures for flexible nanomaterial-based sensors
… as well as the integration of ultrathin or soft substrates. Notably, nanomaterials offer exciting tunable physical, chemical and electrical properties that significantly surpass their bulk counterparts. As a result, they have captivated academic and industrial interests for use as electrical and …
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A new approach to ceramic lubrication: tribopolymerization
The lubrication of ceramic materials is a difficult problem; conventional lubrication techniques are limited or often ineffective. Therefore, the concept of tribopolymerization -- originally proposed by Furey and later modified by Furey and Kajdas -- is used as a new approach to boundary …
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Packaging of a High Power Density Point of Load Converter
… sinks are traditionally used to spread heat, ceramic substrates are gaining in popularity for their superior thermal qualities which can dissipate heat without the use of a heat sink. 3D integration techniques are needed to realize a solution that incorporates the active and components …