Sökning: "Al2O3"

Visar resultat 1 - 5 av 128 avhandlingar innehållade ordet Al2O3.

  1. 1. Microstructure of Alumina (Al2O3) Grown by Oxidation of FeCrAl Alloys and by Chemical Vapour Deposition

    Detta är en avhandling från Chalmers University of Technology

    Författare :Sead Canovic; Chalmers tekniska högskola.; Chalmers University of Technology.; [2009]
    Nyckelord :TEKNIKVETENSKAP; TECHNOLOGY; TEKNIKVETENSKAP; TECHNOLOGY; oxidation; FeCrAl alloys; CVD; TiN; TiC; κ-Al2O3; α-Al2O3; γ-Al2O3;

    Sammanfattning : This thesis consists of two parts: the detailed microstructure of (i) CVD alumina multilayer coatings, and (ii) alumina scales formed on three different FeCrAl alloys. The coatings and oxide scales were characterized by using analytical electron microscopy and different surface analysis techniques. LÄS MER

  3. 2. Microstructure and Wear of CVD Coatings used in Metal Cutting Applications

    Detta är en avhandling från Chalmers University of Technology

    Författare :Andreas Larsson; Chalmers tekniska högskola.; Chalmers University of Technology.; [2000]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEM; EELS; EFTEM; alfa-Al2O3; kappa-Al2O3; gamma-Al2O3; Ti C; N ; CVD; MTCVD; wear; Ca-treated steel;

    Sammanfattning : This thesis is concerned with the microstructural characterisation of wear resistant Al2O3 and Ti(C,N)coatings produced by chemical vapour deposition on cemented carbide cutting tools. The investigation focuses on the effect of deposition conditions on the microstructure and the microstructural evolution of the coatings during heat-treatments and metal cutting. LÄS MER

  4. 3. The microstructure and stability of CVD aluminia coatings

    Detta är en avhandling från Chalmers University of Technology

    Författare :Mats Halvarsson; Chalmers tekniska högskola.; Chalmers University of Technology.; [1994]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; CVD; .alpha.-Al2O3; .kappa.-Al2O3; TEM; SEM; XRD; multilayers; phase transformation; microstructure;

    Sammanfattning : This thesis has examined topics of relevance for increasing the understanding of alumina coatings produced by Chemical Vapour Deposition. The work consists of three parts: (i) The microstructure of Al2O3 coatings; (ii) the .kappa.-Al2O3 -> . LÄS MER

  5. 4. Studies of NOx Storage Catalysts - Preparation, Characterization, Sulfur Deactivation and Micro Kinetic Modelling

    Detta är en avhandling från Chalmers University of Technology

    Författare :Jazaer Dawody; Chalmers tekniska högskola.; Chalmers University of Technology.; [2005]
    Nyckelord :TEKNIKVETENSKAP; TECHNOLOGY; NOx storage and reduction catalysts; sulfur deactivation; NO oxidation; SO2 oxidation; metal oxide additives; Pt precursors; Zeta potential; BaCO3; Al2O3; TEM; SEM; FTIR; kinetic modelling;

    Sammanfattning : For the protection of the global environment, it is essential to decrease the emissions of CO2 which is a green house gas. Lean-burn and diesel engines offer relatively low CO2 emissions and good fuel economy. LÄS MER

  7. 5. Thermodynamic modelling and assessment of some alumino-silicate systems

    Detta är en avhandling från Stockholm : KTH

    Författare :Huahai Mao; KTH.; [2005]
    Nyckelord :TEKNIKVETENSKAP; TECHNOLOGY; thermodynamic modelling; thermodynamic assessment; alumino-silicate system; slag; oxide system; CALPHAD; phase diagram; phase equilibrium; Thermo-Calc; compound energy formalism; ionic two sub-lattice liquid model; AlO2-1 species; Al2O3; CaO; MgO; SiO2; Y2O3; Materialvetenskap;

    Sammanfattning : Alumino-silicate systems are of great interest for materials scientists and geochemists. Thermodynamic knowledge of these systems is useful in steel and ceramic industries, and for understanding geochemical processes. A popular and efficient approach used to obtain a self-consistent thermodynamic dataset is called CALPHAD. LÄS MER