Sökning: "hardmetals"

Visar resultat 1 - 5 av 10 avhandlingar innehållade ordet hardmetals.

  1. 1. Temperature dependent atomic-scale modeling of interfaces in cemented carbides

    Författare :Martin Gren; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; hardmetals; cemented carbides; analytical bond order potential; free energies; wetting; WC-Co; phase diagram; interfaces; complexions; density functional theory;

    Sammanfattning : Material properties can now be calculated directly from first principles using density functional theory (DFT) which has a great predictive power and can, in cases that are difficult to approach experimentally, provide crucial insights on the atomic and electronic level. Such cases include the thermodynamics of interfaces and surfaces which are crucial factors for the structure and macroscopic properties of many materials, where cemented carbides are one example. LÄS MER

  3. 2. Strength and Stability of Interfaces in Cemented Carbides

    Författare :Mikael Christensen; Chalmers University of Technology; []
    Nyckelord :adhesion; segregation; plastic deformation; microstructure; interfaces; electron structure calculations; cermets; sintering; infiltration; cemented carbides; grain boundaries; cutting tools; density-functional theory; hardmetals; WC-Co; wetting;

    Sammanfattning : Cemented carbides are hard composite materials of great technological importance. They are widely used as tool materials in a large variety of applications where the demands on hardness and toughness are high, including e.g.≈mining, turning, cutting, and milling. LÄS MER

  4. 3. Atomic-scale modelling of interfaces in cemented carbides: wetting and strength

    Författare :Martin Gren; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; adhesion; density functional theory; hardmetals; cemented carbides; WC-Co; surfaces; interfaces; grain boundaries; wetting; phase boundaries;

    Sammanfattning : Cemented carbides are composite materials of great technological and industrial importance. They have a unique combination of hardness and toughness and are therefore used widely as tool materials in applications where both high hardness and toughness are demanded. These applications include among others: mining, turning, cutting and milling. LÄS MER

  5. 4. Development of Cermet Microstructures during Sintering and Heat-Treatment

    Författare :Jenni Zachrisson; Chalmers University of Technology; []
    Nyckelord :APFIM; EELS; cemented carbides; quantitative microanalysis; gradients; N ; TEM; EFTEM; hardmetals; EDX; Ti C; light elements;

    Sammanfattning : The work presented in this thesis is concerned with the microstructure of Ti(C, N) based cermet materials used in cutting tool applications. Several techniques have been used to study the microstructure of cermets, in particular transmission electron micro-scopy in combi-na-tion with energy dispersive X-ray analysis and electron energy-loss spectroscopy, energy-filtered transmission electron micro-scopy, atom-probe field-ion microscopy and scanning electron microscopy. LÄS MER

  7. 5. Effect of carbon content on microstructure and performance of a cermet cutting tool material

    Författare :Jenni Zackrisson; Chalmers University of Technology; []
    Nyckelord :atom-probe; TEM; SEM; microanalysis; hardmetals; cemented carbides;

    Sammanfattning : .... LÄS MER