Sökning: "kärnbildning"

Visar resultat 6 - 8 av 8 avhandlingar innehållade ordet kärnbildning.

  1. 6. Modelling phase separation in Fe-Cr alloys : A continuum approach

    Författare :Thomas Barkar; John Ågren; Nele Moelans; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Phase separation; spinodal decomposition; nucleation; diffusion; thermodynamics; kinetics; steel; ferritic;

    Sammanfattning : The formation of Cr-rich and Fe-rich domains upon ageing of an initially homogeneous Fe-Cr alloy at elevated temperatures (300-600 ºC) is commonly referred to as phase separation. The behaviour originates from a miscibility gap in the Fe-Cr phase diagram. LÄS MER

  3. 7. Recovery of Scandium using Antisolvent Crystallization in the Valorization of Scandium-containing Waste Streams

    Författare :Edward Peters; Kerstin Forsberg; Michael Svärd; Jens-Petter Andreassen; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Antisolvent crystallization; ammonium scandium hexafluoride; ammonium metal fluorides; phase equilibria; solubility; supersaturation; seeding; agitation mechanism; crystal size distribution; morphology; Chemical Engineering; Kemiteknik;

    Sammanfattning : Scandium is widely dispersed in the earth’s crust and is rarely concentrated in ores, and a viable option to guarantee a secure supply of scandium is to recover the metal from waste streams of other mining and metallurgical facilities. The valorization of such streams to recover metals of value is a prerequisite to alleviate the global shortages of scandium and other rare earth elements. LÄS MER

  4. 8. Platinum-free Electrocatalysts : Design, Synthesis, and Energy Applications

    Författare :Yi Yang; Inna Soroka; Carina Lagergren; Serhiy Cherevko; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Pt-free electrocatalysts; γ-radiation induced synthesis; size; morphology; structure; and composition of nanocatalysts; ORR; catalytic activity and durability; formation mechanism of catalyst materials in aqueous solutions.; Kemi; Chemistry;

    Sammanfattning : Pt is one of the most commonly used catalysts for green energy applications, such as fuel cells, electrolyzers, and dye-sensitized solar cells. Although enormous effort has been put into improving the catalytic activity and minimizing the usage of Pt in the catalysts, the low abundance and high price of Pt still limit the large-scale commercialization of green energy devices and facilities. LÄS MER