Concept

Céramique

Publications associées (425)

Optimization of mixed conducting perovskites for the application in dense ceramic oxygen separation membranes, used in partial oxidation of natural gas to synthesis gas

Jan Van Herle, Stefan Diethelm, Defne Bayraktar

The aim in this project was the optimization of LaFeO3-based perovskite materials for oxygen separation membranes (OSM). The work was carried out by the Laboratory for High Performance Ceramics, Empa in collaboration with the Laboratory for Industrial Ener ...

2007

LONG LIFETIME SYSTEM FOR THE GENERATION OF SURFACE PLASMAS

Pénélope Leyland

The invention concerns a system of electrodes for generating a surface dielectric barrier discharge totally encapsulated in a ceramic dielectric, using co-fireable ceramic technology (ceramic tapes, LTCC, HTCC, green tapes). The plasma generation device ca ...

2007

Domain wall contributions to the properties of piezoelectric thin films

Dragan Damjanovic

In bulk ferroelectric ceramics, extrinsic contributions associated with motion of domain walls and phase boundaries are a significant component of the measured dielectric and piezoelectric response. In thin films, the small grain sizes, substantial residua ...

2007

Selection and design of brazing fillers for metal-ceramic joints

Matteo Galli

Three different approaches for metal to ceramic brazing are compared using the example of Si3N4/TiN-steel joints: the use of an active filler metal (single layer brazing system), the metallisation of the ceramic and brazing with a non active filler (two-la ...

2007

Development of pressure sensors by powder technology

Peter Ryser, Sebastien Martinerie, Thomas Maeder, Caroline Jacq, Sonia Vionnet Menot

Thick film deposition of conductive, dielectric and resistive pastes on ceramic membranes is a cost effective technique to manufacture piezoresistive pressure sensors. Thick-film resistors consist of a percolating network of conductive oxide nanoparticles ...

2007

Transition between grain boundary and intragrain scattering transport mechanisms in boron-doped zinc oxide thin films

Christophe Ballif, Sylvie Faÿ

A comprehensive model for the electronic transport in polycrystalline ZnO:B thin films grown by low pressure chemical vapor deposition is presented. The optical mobilities and carrier concentration calculated from reflectance spectra using the Drude model ...

2007

Sensors and packages based on LTCC and thick-film technology for severe conditions

Peter Ryser, Thomas Maeder, Caroline Jacq, Hansu Birol, Yannick Sébastien Fournier, Damien Sonney, Raphael Willigens

High temperatures, very high pressures and/or the presence of aggressive media cannot be covered by standard packaging methods, which only provide limited environmental stability. Ceramic technologies such as LTCC (Low Temperature Cofired Ceramic) and thic ...

2007

PZT thin film growth and chemical composition control on flat and novel three-dimensional micromachined structures for MEMS devices

Florian Calame

Piezoelectric micro-electro-mechanical systems (MEMS) are finding an increased interest for applications requiring high frequency operation and high mechanical quality. The aim of this work was to improve piezoelectric MEMS along two main research directio ...

EPFL2007

Production and properties of substituted LaFeO3-perovskite tubular membranes for partial oxidation of methane to syngas

Jan Van Herle, Stefan Diethelm, Defne Bayraktar

Tubular membranes of La0.6Ca0.4Fe0.75Co0.25O3−δ and La0.5Sr0.5Fe1−yTiyO3−δ (y = 0, 0.2) for the application of partial oxidation of methane to syngas were produced by thermoplastic extrusion and investigated by oxygen permeation measurements. The optimum c ...

2007

Enhancing mechanical properties of multiwall carbon nanotubes via sp(3) interwall bridging

William Curtin

Molecular dynamics (MD) simulations under transverse shear, uniaxial compression, and pullout loading configurations are reported for multiwall carbon nanotubes (MWCNTs) with different fraction of interwall sp(3) bonds. The interwall shear coupling in MWCN ...

2007

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