Sökning: "carbonitride"

Visar resultat 1 - 5 av 12 avhandlingar innehållade ordet carbonitride.

  1. 1. Arc Evaporated Titanium Carbonitride Coatings

    Författare :Lennart Karlsson; Wolf-Dieter Münz; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : TiCxN1-x thin films is an important group of coatings for enhancing wear-resistance of, e.g., tools for metal cutting. The influence of microstructure, composition, and residual stress state, on the mechanical properties of such films, have been investigated. LÄS MER

  3. 2. Chemical vapour deposition of sp2-hybridised B-C-N materials from organoborons

    Författare :Laurent Souqui; Anne Henry; Hans Högberg; Henrik Pedersen; John R. Abelson; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; boron nitride; epitaxy; CVD; boron carbide; carbonitride; PECVD;

    Sammanfattning : Thin films of sp2-BN are promising materials for graphene and deep-UV optoelectronics. They are typically deposited by thermally activated chemical vapour deposition (CVD) from triethylboron (TEB) and ammonia (NH3) at 1500 °C, albeit in a narrow process window. LÄS MER

  4. 3. Toward first-principles understanding of carbonitride precipitation in steels

    Författare :Dan Fors; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Steels; Coarsening; Interfaces; Peierls-Nabarro model; Diffusion; Precipitates; Density functional theory; Dislocation network; Misfit; Electronic structure;

    Sammanfattning : The most important and widely used group of metallic alloys is steels, whichare alloys of the element iron together with carbon and usually other elementssuch as B, N, V, Nb and Cr. The strength in these alloys is closely connectedto the distribution of point defects, precipitates and grain boundaries whicheffectively act as obstacles for dislocation migration. LÄS MER

  5. 4. Theoretical studies of boron and transition-metal carbonitride additions in steels

    Författare :Dan Fors; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Electronic structure; Dislocation network; Interfaces; Peierls-Nabarro model; Density functional theory; Steels; Coarsening; Diffusion; Misfit; Precipitates;

    Sammanfattning : Martensitic 9-12%Cr steel alloys are today widely used as critical components in fossil-fired steam power plants with steam temperatures up to 600°C, where sound oxidation resistance and excellent creep strength are required. Their strength and long-term creep resistance are closely connected to the presence and stability of Cr-rich M23C6 (M = Cr, Fe) carbides and densely distributed MX precipitates (M = transition metal, X = C or N), which effectively act as obstacles for dislocation migration. LÄS MER

  7. 5. Microstructure and wear mechanisms of textured CVD alumina and titanium carbonitride coatings

    Författare :Siamak Shoja; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Plastic deformation; Texture; TKD; Electron microscopy; Coatings; CVD; TiCN; α-alumina; Wear mechanisms;

    Sammanfattning : The aim of this thesis is to find the reasons behind how the wear performance of hard coatings produced by chemical vapor deposition (CVD) is influenced by their texture, as this is today not fully known. Therefore, differently textured coatings were synthesized, and subsequently analyzed both before and after specially designed machining tests. LÄS MER