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Showing 1 to 9 of 9 for “"Aluminiumoxide"”.
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Pressureless infiltrated alumina and zirconia based steel - MMCs
Alumina and zirconia based steel-MMCs were produced by pressureless Ti-activated melt infiltration using a high vacuum furnace. The effect of particle size and morphology on the formation of a ceramic network in-situ and MMC properties were investigated using three different alumina powders. The …
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XPS and transport studies of oxide barriers in tunnel magnetoresistance junctions
The thesis work treats the UV light-assisted oxidation of ultra-thin Al films to be employed as insulating barriers in TMR junctions. The oxidations of the ultra-thin Al layers (1-2 nm) was monitored by XPS a surface sensitive and element specific technique. The oxidation process and kinetics were …
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Theoretical and experimental studies related to the compositional and microstructural evolution of alumina thin films
In this thesis, the correlation between plasma chemistry / ion energy and thin film composition / microstructure for cathodic arc deposited alumina thin films is investigated. To contribute towards understanding this correlation, both theoretical and experimental investigations have been performed. …
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Grenzflächenmorphologie von GMR- und TMR-Schichtsystemen
The interface morphology of multilayer structures which are significant for the GMR and TMR effect was investigated by x-ray reflectivity and diffuse scattering. Besides the ex situ x-ray measurements at the Hamburg Synchrotron Laboratory experimantal work regarding the sample preparation and in …
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Zementfreie Hüftkopf-Oberflächenprothese aus Aluminiumoxid : orientierende FEM-Zuverlässigkeitsanalysen
The demand for revisions of hip joints prosthesis has been increasing with the rising life expectancy and the growing number of young patients, who need a hip replacement. As the success and the sustainability of a revised prosthesis is decisively dependent on sufficient bone material, bone …
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Entfernung von Al2O3-Restpartikeln von der Oberfläche korundgestrahlter Titanimplantate durch die ALFREDS-Oberflächenbehandlung : Effekt auf die Biokompatibilität, Osteointegration und Scherhaftfestigkeit in-vivo
BACKGROUND. Cementless endoprosthetic devices are grit-blasted with Al2O3 particles to increase surface roughness and enhance the implants´ osseous integration. Grit blasting leads to an embedding of Al2O3 particles which subsequently cover 24% to 42% [1,2] of total surface area. Dislocated into …
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Selektives Laserschmelzen zur generativen Herstellung von Bauteilen aus hochfester Oxidkeramik
An additive manufacturing technique based on selective laser melting (SLM) for zirconia-alumina ceramic is presented. SLM is a powder bed based layer manufacturing technique that allows for rapid manufacturing of complex shaped objects directly from CAD data. By completely melting a purely ceramic …
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Diamond-like carbon and ceramic materials as protective coatings grown by pulsed laser deposition
A rather large number of nitride, carbide, and oxide thin films are used as hard and wear-resistant coatings, for optical, corrosive, and refractory applications that are of crucial importance. Additional requirements place even more stringent conditions on the deposition processes. The properties …
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Korrosion von polykristallinem Aluminiumoxid (PCA) durch Metalljodidschmelzen sowie deren Benetzungseigenschaften
On high-energy discharge lamps with burners consisting of polycrystalline aluminum oxide (PCA) corrosion leads to relocation of the wall material; the extent of the phenomenon depends on the composition and the wetting behaviour of the liquid salt mixture contained in the lamp. The aim of this work …