Sökning: "air-plasma"

Visar resultat 1 - 5 av 7 avhandlingar innehållade ordet air-plasma.

  1. 1. Loss and recovery of hydrophobicity of polydimethylsiloxane after exposure to electrical discharges

    Författare :Henrik Hillborg; KTH; []
    Nyckelord :silicone rubber; polydimethysiloxane; dydrophobicity; corona; air-plasma; oxygen-plasma; surface characterisation;

    Sammanfattning : Silicone rubber based on polydimethylsiloxane is used ashigh voltage outdoor insulation, due to its ability to preservethe hydrophobic surface properties during service and evenregain hydrophobicity after exposure to electrical discharges.The underlying processes for the hydrophobic recovery arediffusion of low molar mass siloxanes from the bulk to thesurface and reorientation by conformational changes ofmolecules in the surface region. LÄS MER

  3. 2. The effects of stabilizers on the air-plasma-induced surface oxidation of polydimethylsiloxane

    Författare :Kamyar Fateh-Alavi; KTH; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  4. 3. Stabilizers in crosslinked polydimethylsiloxane

    Författare :Kamyar Fateh-Alavi; KTH; []
    Nyckelord :Polymer; Material Science; Polydimethylsiloxane; Stabilizers;

    Sammanfattning : The loss and recovery of the surface hydrophobicity areimportant phenomena when highvoltage insulators, with a shedmaterial composed of polydimethylsiloxane (PDMS), are used. Theloss of hydrophobicity is mostly due to the oxidativecrosslinking which takes place on the PDMS surface duringexposure to electrical discharges, e. g. corona discharges. LÄS MER

  5. 4. Mechanical Behaviour of Gas Turbine Coatings

    Författare :Mats Eskner; KTH; []
    Nyckelord :thermal barrier coatings; TBC; small punch test; miniaturised disc bending test; mdbt; spherical indentation; gas turbine coatings; NiAl; NiCoCrAlY; NiCrAlY; mechanical properties;

    Sammanfattning : Coatings are frequently applied on gas turbine components inorder to restrict surface degradation such as corrosion andoxidation of the structural material or to thermally insulatethe structural material against the hot environment, therebyincreasing the efficiency of the turbine. However, in order toobtain accurate lifetime expectancies and performance of thecoatings system it is necessary to have a reliableunderstanding of the mechanical properties and failuremechanisms of the coatings. LÄS MER

  7. 5. Thermal Barrier Coatings : Durability Assessment and Life Prediction

    Författare :Robert Eriksson; Sten Johansson; Michael Schütze; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : Thermal barrier coating (TBC) systems are coating systems containing a metallic bond coat and a ceramic top coat. TBCs are used in gas turbines for thermal insulation and oxidation resistance. LÄS MER