Sökning: "Metastable phases"

Visar resultat 21 - 25 av 49 avhandlingar innehållade orden Metastable phases.

  1. 21. Growth and Characterization of Ti-Si-N Hard Coatings

    Författare :Axel Flink; Lars Hultman; Johanna Rosén; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ti-Si-N; physical vapor deposition; nitrides; density functional theory; transmission electron microscopy; nanocomposits; nanolaminates; solid solutions; Material physics with surface physics; Materialfysik med ytfysik;

    Sammanfattning : Metastable (Ti,Si)N alloy and TiN/SiNx multilayer thin solid films as well as SiNx/TiN surfaces have been explored. Cubic Ti1-xSixN (0≤x≤0. LÄS MER

  3. 22. Synthesis and Characterization of Ternary Carbide Thin Films

    Författare :Ola Wilhelmsson; Ulf Jansson; Michael Stueber; Uppsala universitet; []
    Nyckelord :Chemistry; Thin film; dc magnetron sputtering; tribology; carbide; PVD; MAX-phase; DFT; solid solution; Kemi;

    Sammanfattning : This thesis reports on synthesis, microstructure and properties of binary and ternary carbide thin films deposited by dc magnetron sputtering. These materials are interesting since they exhibit a wide range of useful properties, such as high hardness, resistance to wear and oxidation, and high electrical conductivity. LÄS MER

  4. 23. Reaching Kinetic Selectivities : In Pursuing Novel Ternary Oxide Coatings, and Beyond

    Författare :Sebastian Öhman; Mats Boman; Tobias Törndahl; Maarit Karppinen; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; CVD; coatings; kinetics; crystallization; nucleation; diffusionless; Al2TiO5; oxides; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi; Kemi med inriktning mot materialkemi; Chemistry with specialization in Materials Chemistry;

    Sammanfattning : Kinetically driven synthesis pathways have the potential to allow new ways to develop materials and phases with much-improved properties. This particularly concerns metastable and multicomponent phases that require a selective kinetic targeting during the synthesis to circumvent the formation of thermodynamically stable products. LÄS MER

  5. 24. An Electron Microscopy Study on Materials in Electronic Packaging

    Författare :Lilei Ye; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; MOS; conductive adhesives; Cu7Sn6; microstructure; SEM; lead-free solders; TEM; crystal structure; Cu6Sn5; modulation structure;

    Sammanfattning : This thesis is concerned with an investigation of the microstructure on materials in electronic packaging. The materials include Ag-filled conductive adhesives, Sn-Ag-based lead free solders and metal-oxide semiconductors. LÄS MER

  7. 25. Extreme water catalyzed transformations of SiO2, TiO2 and LiAlSiO4

    Författare :Kristina Spektor; Ulrich Häussermann; Gunnar Svensson; Natalia Dubrovinskaia; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; extreme water environments; high pressure polymorphism; hydrous stishovite; titania phase transitions; lithium aluminosilicates; zeolites from glass precursors; hydrous pyroxenes; Materials Chemistry; materialkemi;

    Sammanfattning : The dramatic change in properties of water near its critical point (i.e. T = 374 °C and p = 22.1 MPa, note: 100 MPa = 0. LÄS MER