Browsing by Author "Bilbao, L."
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Item Advanced packaging for GaN high power electronics(2008) Marcos, J.; Cobo, I.; Barcena, J.; Maudes, J.; Amado, R.; Vellvehi, M.; Jorda, X.; Obieta, I.; Guraya, C.; Bilbao, L.; Jiménez, C.; Coleto, J.; Tecnalia Research & Innovation; EXTREMAT; PRINTEX; MercadoDevices based on wide-bandgap semiconductors such as SiC or GaN allow high power densities and elevated working temperatures. Here we present an innovative package for high-power electronics, within the framework of an ESA-contracted project. The housing concept, design study, materials selection, manufacturing method and first test results are the parameters to be followed in order to get this innovative electronic package. Materials are selected for their high thermal conductivity (TC) and low coefficient of thermal expansion (CTE). Several materials were selected: A1N was selected as substrate material, and novel metal-matrix composites (MMCs) based on Cu-Diamond were evaluated as heat-sink materials. Determination of the final dimensions of the housings according to the new design was required to get a complete bonding. This new heat sink geometry has been validated and the new components fabrication has been already started. An improved surface quality has been achieved, which will increase the contact between the heat sink and the aluminum spreader for electrical characterization. Subsequently, a complete bonding study between ceramic materials and the MMCs was performed. Determination of the final dimensions of the housings according to the new design was required to get a complete bonding. This new MMCs heat sink geometry has been validated and the new components fabrication has been selected. An improved surface quality has been achieved, which will increase the contact between the heat sink and the aluminum spreader for high temperature electrical characterization. In order to obtain fully dense materials A1N was manufactured by pressureless sintering, while the MMCs parts were manufactured by hot-pressing. The MMCs powders were obtained by an electroless plating process. Preliminary characterization of the housing and its parts show encouraging results as a solution for high-power devices working at temperatures up to 400 °C. TC near 500W/mK and CTEs of around 10 ppm/K have been obtained. These are comparable to the stateof-the-art materials. Out-gassing, thermal cycling and hermeticity tests of the packages and high temperature electrical characterization of the electronic paths and global package were performed. The presented new packaging solutions are showing great promise for space applications such as high-frequency power amplifiers for satellite communications and for radar transmitters, and have started to generate an interest from commercial space-system manufacturers.Item Innovative packaging solution for power and thermal management of wide-bandgap semiconductor devices in space applications(American Institute of Aeronautics and Astronautics Inc., 2006) Barcena, J.; Merveille, C.; Maudes, J.; Vellvehi, M.; Jorda, X.; Obieta, I.; Guraya, C.; Bilbao, L.; Jiménez, C.; Coleto, J.; EXTREMAT; PRINTEX; Tecnalia Research & Innovation; MercadoDevices based on wide-bandgap semiconductors such as SiC or GaN allow high power densities and elevated working temperatures. Here we present an innovative package for high-power electronics, within the framework of an ESA-contracted project. The paper shows the housing concept, design study, materials selection, manufacturing method and first test results. Materials are selected for their high thermal conductivity (TC) and low coefficient of thermal expansion (CTE). Several materials were selected: AlN was selected as substrate material, and novel metal-matrix composites (MMCs) based on Cu-Diamond and CuVapour Grown Carbon Nanofibres (VGCNFs) were evaluated as heat-sink materials. Subsequently, a complete bonding study between ceramic materials and the MMCs was performed. In order to obtain fully dense materials AlN was manufactured by pressureless sintering, while the MMCs parts were manufactured by hot-pressing. The MMCs powders were obtained by an electroless plating process. Preliminary characterisation of the housing and its parts show encouraging results as a solution for high-power devices working at temperatures up to 300 °C. TC near 500W/mK and CTEsof around 10 ppm/K. have been obtained. These are comparable to the state-of-the-art materials. Out-gassing, thermal cycling and hermeticity tests of the packages were performed. The presented new packaging solutions are showing great prorrise for space applications such as high -frequency power amplifiers for satellite communications and for radar transmitters, and have started to generate an interest from commercial space-systemmanufacturers.Item Innovative packaging solution for power and thermal management of wide-bandgap semiconductor devices in space applications(2008-03) Barcena, J.; Maudes, J.; Vellvehi, M.; Jorda, X.; Obieta, I.; Guraya, C.; Bilbao, L.; Jiménez, C.; Merveille, C.; Coleto, J.; EXTREMAT; PRINTEX; Tecnalia Research & Innovation; MercadoDevices based on wide-bandgap semiconductors such as SiC or GaN allow high power densities and elevated working temperatures. Here we present an innovative package for high-power electronics, within the framework of an ESA-contracted project. The paper shows the housing concept, design study, materials selection, manufacturing method and first test results. Materials are selected for their high thermal conductivity (TC) and low coefficient of thermal expansion (CTE). Several materials were selected: AlN was selected as substrate material, and novel metal-matrix composites (MMCs) based on Cu-diamond and Cu-vapour grown carbon nanofibres (VGCNFs) were evaluated as heat-sink materials. Subsequently, a complete bonding study between ceramic materials and MMCs was performed. In order to obtain fully dense materials AlN was manufactured by pressureless sintering, while the MMC parts were manufactured by hot-pressing. The MMC powders were obtained by an electroless plating process. Preliminary characterisation of the housing and its parts show encouraging results as a solution for high-power devices working at temperatures up to 300 °C. TC near 500 W/mK and CTEs of around 10 ppm/K have been obtained. These are comparable to the state-of-the-art materials. Out-gassing, thermal cycling and hermeticity tests of the packages were performed. The presented new packaging solutions show great promise for space applications such as high-frequency power amplifiers for satellite communications and for radar transmitters, and have started to generate an interest from commercial space-system manufacturers.Item Nanozirconia partially coated MWNT: Nanostructural characerization and cytotoxicity and lixivation study(2008) Garmendia, N.; Bilbao, L.; Muñoz, R.; Goikoetxea, L.; García, A.; Bustero, I.; Olalde, B.; Garagorri, N.; Obieta, I.; PRINTEX; Biomateriales; Tecnalia Research & InnovationCarbon nanotubes could avoid the crack propagation and enhance the toughness of the ceramic material used for prostheses applications. So nanozirconia partially coated carbon nanotubes have been obtained via hydrothermal synthesis of zirconia nanoparticles in presence of multiwall carbon nanotubes. The as covered nanotubes should have a better wettability in the ceramic matrix and improve the dispersion of the CNTs in the nanocomposite, which results in a new ceramic biomaterial with a longer lifetime and better reliability. The obtained product has been structurally characterized by several techniques such as FTIR, XRD, SEM, AFM, EELS, XPS and TGA. The citotoxicity of the sintered product was studied by the change in the pH and ICP-AES in in-vitro biocompatibility tests.Item Sprayed microgels onto 2D and 3D scaffolds as drug eluting coatings(2008) Juan, M. J.; Olalde, B.; Jurado, M. J.; Mattioli, S.; Bilbao, L.; Saez-Martinez, V.; MATERIALES PARA CONDICIONES EXTREMAS; Biomateriales; Tecnalia Research & Innovation; PRINTEXBig advances are being achieved in the design of new implantable devices. Coated scaffolds capable of releasing bioactive agents for inhibiting totally or partially the inflammatory response of the surrounding tissues, are now being regarded as potential useful systems. Polymeric nanoparticles are known to be able to provide a programmable and sustained local drug delivery [1-3]. In addition, biodegradable and biocompatible scaffolds having a highly open porous structure and good mechanical strength are needed to provide an optimal microenvironment for cell proliferation, migration, and differentiation, and guidance for cellular in-growth from host tissue [4]. This study describes preliminary results on a novel coating method using spraying techniques for coating micro-nanometric crosslinked hydrogels on 3D biodegradable scaffolds.Item Zirconia coating of carbon nanotubes by a hydrothermal method(2008-11) Garmendia, N.; Bilbao, L.; Muñoz, R.; Imbuluzqueta, G.; García, A.; Bustero, I.; Calvo-Barrio, L.; Arbiol, J.; Obieta, I.; PRINTEX; SISTEMAS FOTOVOLTAICOS; Tecnalia Research & InnovationCarbon nanotubes have unique mechanical properties that open attractive possibilities in many fields, such as the biomedical one. Currently, zirconia ceramics are widely used as femoral heads, but case studies show that delayed failure can occur in vivo due to crack propagation. Nanotubes could avoid the slow crack propagation and enhance the toughness of the ceramic material used for prostheses fabrication. In this work, single-wall carbon nanotubes and multi-wall carbon nanotubes have been partially coated with nanozirconia via hydrothermal synthesis and characterized by several techniques: X-ray diffraction, infrared spectroscopy, scanning electron microscope, transmission electron microscope, electron energy loss spectra, X-ray photoelectronic spectroscopy and atomic force microscopy. By means of these techniques, the existence of bonds between zirconium and the carbon nanotube has been proved. The as covered nanotubes should offer a better wettability in the ceramic matrix and improve the dispersion of the carbon nanotubes, to obtain the desired new ceramic biomaterial with a longer lifetime and better reliability.