Sökning: "Y2O3"

Visar resultat 1 - 5 av 21 avhandlingar innehållade ordet Y2O3.

  1. 1. Thermodynamic modelling and assessment of some alumino-silicate systems

    Författare :Huahai Mao; Bo Sundman; Gunnar Eriksson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND 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; Materials science; Teknisk 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

  3. 2. Development of Nanostructured Tungsten Based Composites for Energy Applications

    Författare :Mazher Ahmed Yar; Mamoun Muhammed; Per-Olov Käll; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Tungsten; Nano-tungsten; ODS tungsten; W-La2O3; W-Y2O3; SPS; Plasma-facing materials; Armour material; fusion material;

    Sammanfattning : Tungsten (W) based materials can be used in fusion reactors due to several advantages. Different fabrication routes can be applied to develop tungsten materials with intended microstructure and properties for specific application including nanostructured grades. LÄS MER

  4. 3. Synthesis of Yb:Y2O3 nanoparticles and fabrication of transparent polycrystalline yttria ceramics

    Författare :Johanne Mouzon; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materialteknik; Engineering Materials;

    Sammanfattning : More efficient laser materials are needed for space applications in order to save weight and make cost-savings. The fabrication of polycrystalline ceramic materials is a solution to obtain new compositions with better efficiency. LÄS MER

  5. 4. Grain Morphology and Intergranular Structure of Si3N4 and Al2O3 Based Ceramics

    Författare :Håkan Björklund; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; whiskers; stereology; electron microscopy; sintering; silicon nitride; quantitative microscopy; grain growth; ceramics; microstructure; aluminium oxide;

    Sammanfattning : This thesis concerns factors controlling the grain morphology in Si3N4 and Al2O3 based ceramics. The microstructures of the ceramics were characterized by scanning electron microscopy in combination with quantitative microscopy and stereologic methods. LÄS MER

  7. 5. The Microstructure of Metal Oxide Additive Silicon Nitride Ceramics

    Författare :Maria Knutson Wedel; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; microstructure; SEM; HIP; TEM; ZrO2; Si3N4;

    Sammanfattning : This work is concerned with Si3N4 ceramics fabricated with different metal oxide additives, viz. Y2O3, Al2O3, ZrO2 and ZrO2(+3 mol% Y2O3), which have been densified by hot isostatic pressing (HIP). LÄS MER