Sökning: "amorphous alumina"

Hittade 5 uppsatser innehållade orden amorphous alumina.

  1. 1. Chromia-Alumina Thin Films from Alkoxide Precursors : From Precursor Synthesis to Deposition and Characterisation

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Oorganisk kemi

    Författare :Elina Elvelo; [2023]
    Nyckelord :alkoxide; synthesis; thin film; coating; alumina; chromia; spinodal decomposition;

    Sammanfattning : A hetero-bimetallic alkoxide CrAl3(OiPr)12 was synthesised through metathesis of achromium(III)chloride THF complex (CrCl3 . 3 THF) and 3 KAl(OiPr)4.It was used as a single sourceprecursor to make oxide powders and films with 1:3 chromium/aluminium compositionthrough sol-gel synthesis. LÄS MER

  3. 2. All-Oxide Ceramic Matrix Composites : Thermal Stability during Tribological Interactions with Superalloys

    Master-uppsats, Luleå tekniska universitet/Materialvetenskap

    Författare :Daniel Vazquez Calnacasco; [2021]
    Nyckelord :Ceramic Matrix Composites; All-Oxide Ceramic Matrix Composites OCMC ; Oxide-Oxide Ceramic Matrix Composites Ox-Ox CMC Ox Ox CMC ; Continuous-Fiber Ceramic Composites CFCC ; Long Fiber Composites LFC ; Ceramic Fiber-Matrix Composites CFMC ; Fiber Reinforced Ceramics FRC ; Superalloys; Inconel 718; Tribology; Elevated Temperature; Alumina; Aluminosilicate; Materiales Compuestos de Matriz Cerámica; Compuestos de Matriz Cerámica base Óxido; Superaleaciones; Inconel 718; Tribología; Alta Temperatura; Alumina; Aluminosilicatos;

    Sammanfattning : The challenges faced in today’s industry require materials capable of working in chemically aggressive environments at elevated temperature, which has fueled the development of oxidation resistant materials. All-Oxide Ceramic Matrix Composites (OCMC) are a promising material family due to their inherent chemical stability, moderate mechanical properties, and low weight. LÄS MER

  4. 3. Noble metal catalysts for the hydrocracking of FT waxes

    Master-uppsats, KTH/Skolan för kemivetenskap (CHE)

    Författare :Rodrigo Suárez París; [2012]
    Nyckelord :Hydrocracking; Fischer-Tropsch; Hexadecane; Platinum; Palladium;

    Sammanfattning : Bifunctional catalysts consisting of palladium or platinum and supported on amorphous silica-alumina were prepared and tested in the hydrocracking of n-hexadecane, which is considered to be representative of n-paraffins in hydrocracker feeds. In addition to the evaluation of the  physicochemical properties, a comprehensive study on catalyst activity and selectivity has been conducted, in the full range of conversions. LÄS MER

  5. 4. Noble Metal Catalysts for the Hydrocracking of Fischer-Tropsch waxes

    Master-uppsats, KTH/Skolan för kemivetenskap (CHE)

    Författare :Ibone Elorriaga de la Fuente; [2012]
    Nyckelord :hydrocracking; platinum; palladium; Fischer Tropsch; hexadecane;

    Sammanfattning : Fischer-Tropsch synthesis enables the production of high quality diesel fuel from biomass derived synthesis gas. In order to increase the overall diesel yield, it is necessary to perform a subsequent hydrocracking of the long-chain linear paraffins. LÄS MER

  7. 5. Alternative method for deposition of alumina thin films

    Master-uppsats, Institutionen för fysik, kemi och biologi

    Författare :Daniel Magnfält; [2009]
    Nyckelord :alumina; RF-sputtering; hydrogen; fluorine; amorphous alumina; aluminiumoxid; RF-sputtering; väte; fluor; amorft aluminumoxid;

    Sammanfattning : Deposition of alumina thin films in the presence of fluorine as a method for reducing thehydrogen incorporation in the films was investigated in this thesis. Hydrogen incorporated in alumina thin films have been shown to cause a lower density and refractive index in amorphous films, assist electrical conduction through thin amorphous films as well as inhibiting the formation of the thermally stable α-phase. LÄS MER