Tesis a la primera quinzena del mes de març
Una alumna de la Universitat Ramon
Llull ha assolit el grau de Doctor a la primera quinzena del mes de març. L’estudiant
pertany a l’Institut Químic de Sarrià i la seva tesis ha obtingut la qualificació
excel·lent cum laude.
Laura López García (Institut Químic de Sarrià ) Desarrollo de capas basadas en aluminio y titanio a partir de la fase vapor ha estat dirigida pels doctors Carles Coromines i Jordi Abellà:
Deposition
of metallic and ceramic coatings on steels by Chemical Vapor Deposition in
Fluidized Bed Reactors at Atmospheric Pressure (AP/FBR-CVD) has been investigated.
The capability of Al coatings deposited by AP/FBR-CVD to protect structural
materials to avoid their corrosion in contact with molten Pb-Bi has been
investigated. Advanced ceramic coatings based in titanium nitride (TiN) and
aluminium and titanium nitride (Ti-Al-N) have been deposited by AP/FBR-CVD with
simultaneous nitridation of specimens in one-step, as an alternative to duplex
processes developed with vacuum equipments. Nitrides have been deposited from
reaction of TiCl4 or AlCl3 precursors with NH3
or N2 at temperatures between 600 and 950 ºC. A decrease in crystal
average size of TiN by Al incorporation in Ti-Al-N coatings has been detected.
On the other hand, chromium and aluminium nitride coatings ((Cr,Al)N) have been
deposited by Physical Vapor Deposition processes (PVD) and oxidation kinetics
of coatings in air at high temperatures have been investigated. It has been
detected that the increase of the Al content in the coatings improves the
resistance of the coatings to oxidation at high temperatures.