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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physics Letters A 181 (1993), S. 33-38 
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    ISSN: 0378-4371
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 23 (Oct. 2007), p. 1-8 
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper we try to summarize the research activities of the PM group in theUniversity Carlos III of Madrid. This research group is highly devoted to PM activities coveringdifferent fields (both under the point of view of the materials and the processes). In the PM labpowders can be produced by spray pyrolysis, mechanical alloying and water/gas atomization. Thesepowders can be processed by pressing and sintering, powder injection moulding, isostaticpressing,… Sintering facilities cover vacuum and gas controlled sintering. Regarding the materials,in the group we have different research lines covering low alloyed steels, stainless steels, HSS,ferrites, metal matrix composite (Al and Fe base), Ti, intermetallics, ceramics with functional andstructural propierties, … In this paper we describe slightly some of the recent developmentsproduced in the group which is not exhaustive (are there a few more) but representative about weare doing at present
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 27 (1997), S. 550-557 
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Electrochemical impedance spectroscopy (EIS) and d.c polarization resistance measurements (Rp) were used to study the corrosion resistance of surface layers produced by nitrogen ion implantation into copper substrates. Ion implantation was carried out using a Wickham ion beam generator, applying an acceleration voltage of 100keV, a mean current of 0.40 mA and a nitrogen dosage of 4 × 1017 ions cm−2. Surface analyses were made by Auger electron spectroscopy (AES). Electrochemical measurements (EIS and Rp) performed in a 0.6m sodium chloride solution show nitrogen-implanted specimens have greater a.c. and d.c. apparent polarization resistance than nonimplanted specimens. The results obtained with electrochemical measurements indicate that nitrogen ion implantation in copper forms a protective surface layer which improves the corrosion resistance of the pristine material, a feature of great interest for the design of new contact materials for the electricity and electronic industries.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 8535-8538 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Influence of the interaction between nearest-neighbor adatoms in a reaction of catalyzed oxidation of carbon monoxide has been studied by Monte Carlo simulation. The transition probabilities are chosen in the Arrhenius form, and the activation energy is divided into two additive terms, corresponding to the action of the substrate and to the interaction between nearest adatoms, respectively. When the interaction makes desorption easier or hinders adsorption the behavior is similar: Three steady state regimes or phases were observed; in the first phase, the surface is poisoned by oxygen; in the second phase there is a reactive steady state in which carbon dioxide is continuously produced, and in the third phase, the surface is poisoned by carbon monoxide. The transition from the O-poisoned phase to the reactive phase is continuous, or second order, and the transition from the reaction to the CO-poisoned phase is first order. The same occurs when the interaction is not considered. The interaction makes the second zone wider, where carbon dioxide is being produced. When the interaction makes easier adsorption or hinders desorption only two phases are observed: In the first phase the surface is poisoned by oxygen and in the second phase it is poisoned by carbon monoxide and the transition from one to another is first order.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 8069-8075 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Bistability and oscillations of temperature and concentrations are observed in a kinetic model, based on the oxidation of carbon monoxide on a solid surface. The macroscopic kinetic equations, which govern the reaction, are obtained by applying a closure approximation of mean-field type. With the aim of studying how the interaction affects the oscillatory behavior in the reaction, we have explicitly considered the interaction between nearest-neighbor adsorbed species, CO–CO, CO–O, and O–O. Interactions favoring CO2 production are analyzed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 365-368 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The MIM technology is an alternative process for fabricating near net shape componentsthat usually uses gas atomised powders with small size (〈 20 μm) and spherical shape. In this work,the possibility of changing partially or totally spherical powder by an irregular and/or coarse one thatis cheaper than the former was investigated.Different bronze 90/10 components were fabricated by mixing three different types of powder: gasatomised spherical powder (usual MIM powder 〈 22 μm) and two water atomised irregular powders(size 〈 35 μm and 〈 140 μm). The blends were made by using only two types of powder in eachmixture with the following volume proportions (100/0, 67/33, 33/67, 0/100).The influence of the particle size and shape on the powder packing density and sintering stage wasanalyzed through the apparent density of the powder blends, as well as, densification, hardness andporosity of the sintered parts.The addition of irregular and/or coarse powder was found to affect the moulding process, althoughgood densifications and hardnesses were obtained in the sintering step. Therefore it could be apromising way to diminish production costs in this technology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 497-500 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the present work it has been studied the corrosion performance of a powdermetallurgical aluminum alloy in aeronautical environments as a function of heat treatment. For thispurpose an Al-Cu-Mg prealloyed powder was uniaxially pressed at 600 MPa followed by sinteringat 590ºC in nitrogen for 60 minutes. Subsequently sintered samples were heat treated to the T4 andT6 state. Corrosion behaviour was assessed by means of potentiodynamic polarization (PPT) inDilute Harrison solution (DHS), which is considered to closely emulate the atmosphericenvironment for aircraft. PPT results for the equivalent wrought counterpart, AA2024 in its typicalheat treatment for aeronautical applications T3, are also presented for comparison. Themicrostructure of each sample has been examined by Scanning Electron Microscopy (SEM) andEnergy-Dispersive analysis of X-ray (EDX).Similar corrosion performance was observed for both the as sintered sample and its equivalentwrought counterpart, while corrosion resistance of the PM materials was improved by the heattreatment, especially in the T4 state
    Type of Medium: Electronic Resource
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  • 9
    facet.materialart.
    Unknown
    MDPI Publishing
    In: Materials
    Publication Date: 2017-01-25
    Description: The aim of this work was to prepare hydroxyapatite coatings (HAp) by a sol-gel method on Ti6Al4V alloy and to study the bioactivity, biocompatibility and corrosion protection behaviour of these coatings in presence of simulated body fluids (SBFs). Thermogravimetric/Differential Thermal Analyses (TG/DTA) and X-ray Diffraction (XRD) have been applied to obtain information about the phase transformations, mass loss, identification of the phases developed, crystallite size and degree of crystallinity of the obtained HAp powders. Fourier Transformer Infrared Spectroscopy (FTIR) has been utilized for studying the functional groups of the prepared structures. The surface morphology of the resulting HAp coatings was studied by Scanning Electron Microscopy (SEM). The bioactivity was evaluated by soaking the HAp-coatings/Ti6Al4V system in Kokubo’s Simulated Body Fluid (SBF) applying Inductively Coupled Plasma (ICP) spectrometry. 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium bromide (MTT) and Alamar blue cell viability assays were used to study the biocompatibility. Finally, the corrosion behaviour of HAp-coatings/Ti6Al4V system was researched by means of Electrochemical Impedance Spectroscopy (EIS). The obtained results showed that the prepared powders were nanocrystalline HAp with little deviations from that present in the human bone. All the prepared HAp coatings deposited on Ti6Al4V showed well-behaved biocompatibility, good bioactivity and corrosion protection properties.
    Electronic ISSN: 1996-1944
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by MDPI Publishing
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