Sökning: "cemented carbides"

Visar resultat 16 - 20 av 33 uppsatser innehållade orden cemented carbides.

  1. 16. Microstructure investigations of WC-Co cemented carbide containing Eta-phase and Cr

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Tillämpad materialvetenskap

    Författare :Sofia Tran; [2018]
    Nyckelord :Cemented carbide; Eta-phase; Chromium; Material characterization;

    Sammanfattning : Cemented carbide containing sub carbide phases, M6C and M12C, known as eta-phase, increases the lifetime milling cutters due to increased resistance to comb cracks. When milling, the inserts much sustain high temperatures, meaning edgeline toughness and thermal fatigue resistance are needed. LÄS MER

  3. 17. Wear and degradation of rock drill buttons with alternative binder phase in granite and sandstone

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Tillämpad materialvetenskap

    Författare :Anders Holmberg; [2017]
    Nyckelord :Hard Metals; Cemented Carbides; Tungsten; Alternative binder phase; Tribology; Wear; Degradation; Rock drilling; Drill bit buttons;

    Sammanfattning : In this thesis, drill bit buttons with cobalt, nickel and iron binders in different compositions have been tested against granite and sandstone and the wear and friction have been measured. Furthermore, the wear and degradation of the buttons have been categorized. LÄS MER

  4. 18. Adhesion of CVD coatings on new cemeted carbides

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Tillämpad materialvetenskap

    Författare :Eric Bojestig; [2016]
    Nyckelord :cemented carbide; adhesion; alternative binder phase; CVD coating; hard metal;

    Sammanfattning : Steel turning inserts cemented carbides have a binder phase consisting of cobalt (Co). However, in recent years a study from the United States National Toxicity Program (NTP) found that cobalt powder is carcinogenic upon inhalation. The European Union's REACH have therefore also classified cobalt powder as carcinogenic upon inhalation. LÄS MER

  5. 19. Simulation of Gradient Formation in Cemented Carbides

    Master-uppsats, KTH/Materialvetenskap

    Författare :Armin Salmasi; [2016]
    Nyckelord :Cemented Carbides; Gradient; Simulation;

    Sammanfattning : The aim of the present work is to study the formation of the cubic carbide phase (gamma phase) free gradient zone and the gamma cone structure at the edges of gradient sintered cemented carbides. Four types of cemented carbides; WCTi(C,N)-Co, WC-Ti(C,N)-Ni, WC-Ti(C,N)-Fe, WC-(Ti,Ta,NB)(C,N)-Co were gradient sintered and the thicknesses of the gradients were measured. LÄS MER

  7. 20. Tribological testing of top hammer drill buttons

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Tillämpad materialvetenskap

    Författare :Carl Johan Hassila Karlsson; [2016]
    Nyckelord :tribology; wear; cemented carbides; WC-Co; sandstone; granite; rock drilling; top hammer drilling; wear test; friction;

    Sammanfattning : In the present work further modifications are implemented to an existing test setup for the evaluation of the wear of cemented carbide drill buttons in rock drilling applications. The test setup has been evaluated in previous diploma works, which has shown that the test successfully mimics the wear seen in rock drilling applications. LÄS MER