Search for dissertations about: "WC-Co"

Showing result 1 - 5 of 48 swedish dissertations containing the word WC-Co.

  2. 1. Aqueous Processing of WC-Co Powders

    Author : Karin M. Andersson; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Hard Metal; Cemented Carbide; WC-Co; Tungsten Carbide; Cobalt; Oxidation; Dissolution; Surface Complexation; XPS; AFM; Colloidal Probe; Hamaker Constant; Cauchy; WO3; CoOOH; ESCA; Zeta-Potential; Surface Potential; Poly ethylene imine ; PEI; Suspensi;

    Abstract : The object of this work is to obtain a fundamentalunderstanding of the principal issues concerning the handlingof an aqueous WC-Co powder suspension.The WO3 surface layer on the oxidised tungsten carbidepowder dissolves at pH>3 with the tungsten concentrationincreasing linearly with time. READ MORE

  4. 2. Aqueous Processing of WC-Co Powders Aqueous processing of WC-Co powders

    Author : Karin Andersson; KTH; []
    Keywords : Hard metal; cemented carbide; WC-Co; tungsten oxide; tungsten carbide; oxidation; cobalt; dissolution; surface complexation; XPS; AFM; colloidal probe; force curve; Hamaker constant; Cauchy; WO3; CoOOH; CoO; Co3O4; ESCA; zeta-potential; surface poten;

    Abstract : The object of this work is toobtain a fundamental understanding of the principal issuesconcerning the handling of WC-Co powders, in an aqueousmedium.The oxidation and dissolution oftungsten carbide powder dispersed in water was investigatedusing X-ray Photoelectron Spectroscopy (XPS) and leachingstudies. READ MORE

  5. 3. Atomistic modeling of interfaces in WC-Co cemented carbides

    Author : Martin Petisme; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; analytic bond order potentials; weing; WC-Co; grain boundary sliding; grain boundaries; density functional theory; molecular dynamics; interfaces; cemented carbides;

    Abstract : Grain and phase boundaries are crucial in understanding the properties of real materials. In this thesis, interfaces in WC–Co cemented carbide are modeled atomistically using density functional theory (DFT) and analytic interatomic potentials. READ MORE

  6. 4. Thermochemical processing of nanostructured W-Co and WC-Co powders

    Author : Zongyin Zhang; KTH; []
    Keywords : Nanostructured powder; WC-Co; W-Co; Co-precipitation; Chemical precursor; Calcination; Phase constitute; Processing; Calcination; Reduction; Carburization;

    Abstract : .... READ MORE

  7. 5. Atomic-scale investigation of interfacial structures in WC-Co at finite temperatures

    Author : Erik Fransson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; complexions; phase diagrams; interfaces; force constants; cluster expansions; atomic-scale modeling; free energies; cemented carbides; WC--Co;

    Abstract : WC-Co cemented carbides combine superb hardness with high toughness making them ideal for usage in high-speed machining of steels and in wear resistance tools. These excellent mechanical properties are to a large extent dependent on the microstructure and thus the interfacial properties of the material. READ MORE