A5065165565- High-Temperature Coating Behaviors
- Metal and Thin Film Mechanics
- Semiconductor materials and devices
- Catalytic Processes in Materials Science
- Ion-surface interactions and analysis
- Nuclear Materials and Properties
- Aluminum Alloys Composites Properties
- Advanced Materials Characterization Techniques
- Advanced ceramic materials synthesis
- Electron and X-Ray Spectroscopy Techniques
- Crystal Structures and Properties
- Corrosion Behavior and Inhibition
- Gas Sensing Nanomaterials and Sensors
- Metallurgical Processes and Thermodynamics
- Intermetallics and Advanced Alloy Properties
- Particle accelerators and beam dynamics
- Chalcogenide Semiconductor Thin Films
- Metal Alloys Wear and Properties
- nanoparticles nucleation surface interactions
- ZnO doping and properties
- Copper-based nanomaterials and applications
- High Temperature Alloys and Creep
- Diamond and Carbon-based Materials Research
- Chemical and Environmental Engineering Research
- Quantum Dots Synthesis And Properties
Universidad Complutense de Madrid
2006-2017
Universidad Autónoma de Madrid
1998-2003
Pontifical Catholic University of Rio de Janeiro
2001
The low-temperature oxidation during deposition by evaporation of molybdenum thin films has been investigated. Analysis x-ray photoelectron spectroscopy and diffraction reveals that small differences in the substrate temperature may give rise to important changes final composition structure oxide. Changes binding energy line shape Mo 3d5/2−Mo 3d3/2 doublet attributed oxygen incorporation have studied. Two principal steps can be distinguished, with a transition ∼310 °C. Up temperatures °C,...
Abstract Ferritic steels in steam turbines for the power industry operate without coatings temperature range of 590–600 °C. For higher operation temperatures substrate has to be replaced or coated, otherwise ferritic at a 650 °C develops thick oxide scales that promote sudden turbine blade failure. The advantage use is coated are much less expensive than austenitic stainless nickel base superalloys. In order go forward design, Thermo‐Calc code was used as mass spectrometry (MS)‐data....
Aluminum-silicon coatings were deposited onto stainless steels AISI 304 and 317. The deposition was performed at 540°C with a ratio of active gases HCl/H2 1/15.3; argon used as carrier gas. bed the FBR-CVD process consisted 2.5 g aluminum powder, 7.5 silicon powder 90 alumina. After deposited, each sample given heat treatment to improve its mechanical properties oxidation behavior by diffusing alloying elements. Thermodynamic simulation Thermo-Calc software investigate composition material....
Indium tin oxide thin films consisting mainly of whiskers have been deposited on glass by electron beam evaporation. Low deposition rates (35 Å/min) and substrate temperatures in the 120–400 °C range were used. Morphology scanning microscopy, crystal structure, energy dispersive analysis x-rays, x-ray photoelectron spectroscopy compositions, optical conducting properties studied as a function temperature growth further annealing air. Whiskers associate produce flatter surfaces, grain size...
Aluminum coatings were deposited on stainless steels AISI 304 and 316 at a temperature range from 560 to 600°C by CVD-FBR, using bed consisting of 10% aluminum powder 90% inert (alumina) which was fluidized with Ar an activator mixture hydrochloric acid hydrogen (HCl/H2). The coating without heat treatment includes the follow species: Al13Fe4, Fe2Al5, FeAl2 Al5FeNi for both steels. In addition, causes diffuse into substrate iron towards surface coating, making transformation previous...
Aluminum coatings have been obtained using the Chemical Vapor Deposition of Fluidized Bed Reactor technique (CVD-FBR), on austenitic stainless steels (AISI 304, AISI 316 and 317), in order to evaluate resistance steam oxidation at 700ºC. The were characterized their morphology/composition crystalline phases Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Analysis (EDAX) Diffraction (XRD). In addition, thermodynamic simulation was performed Thermo-Calc® software make deposition...
Titanium nitride films are used to prevent “multipactor” plasma in rf devices due their low secondary electron emission coefficient (σ) ultrahigh vacuum. This work refers the increase of this on exposure air and effect ion beam assisted deposition (IBAD) its recovery, relevant components for space applications. Two modes were compared: a simple sublimation titanium nitrogen atmosphere energy (200 eV-Ar+) IBAD. The sample characterization included σ, bulk surface compositions, by dispersive...
We have investigated the oxidation of austenitic stainless steels AISI SAE: 304, 316 and 317, at temperatures 700 to 750°C in an atmosphere approaching 100% steam, a time range 10 1000h exposure. The purpose is check quality studying morphology, composition structure phases layers formed on oxide scale samples by scanning electron microscopy (SEM), X-ray analysis energy dispersive (EDAX) Diffraction (XRD), respectively. Just as well, has been performed different times, systematic study...
Thermogravimetric analysis (TGA) and mass spectrometry (MS) of initial steam oxidation at 650 °C in Ar + 40% H 2 O for 150 h the P92 steel with without aluminum‐silicon‐CVD coating were investigated. We deposited Al‐Si on ferritic/martensitic (F/M) using chemical vapor deposition a fluidized bed reactor (CVD‐FBR) 580 subsequently heat‐treated 700 h. The thermodynamic software Thermo‐Calc was used theoretical simulations equilibrium under similar experimental conditions from 500 to 900 °C....
Supercritical Steam Turbines will be operated at 3.00 Bar and 650 C. It meas that the ferrritic substrate steels must coated in order to resist oxidation processes appears those operation conditions. At present time, there are metallic coatings canidates one option for this problem, but a new way obtain better performances is application of nano-structred composed by nitrides on ferritic such as P92. Among different processes, an important degradtaion process appeaars temperature...
Oxidation was made of austenitic stainless steel AISI 317 aluminum coated by chemical vapor deposition in a fluidized bed at temperatures 700 °C and 750 °C, an environment with 100% steam, to evaluate their corrosion performance. Gain mass curves were ground oxide films analyzed SEM X-ray diffraction observe the morphology oxides. Thermodynamic simulation carried out during steam oxidation substrates for possible solid gaseous phases which could be formed presence water atmosphere pressure....
Abstract not Available.