Sökning: "boron nitride"

Visar resultat 11 - 15 av 16 uppsatser innehållade orden boron nitride.

  1. 11. Self Lubricating Components

    Kandidat-uppsats, Uppsala universitet/Institutionen för teknikvetenskaper

    Författare :Filip Selenius Larsson; Simon Tidén; Niklas Levin Bjärnlid; Daniéla Quist; Tim Melin; [2017]
    Nyckelord :self lubricating; solid lubricant; high speed steel; powder metallurgy; friction; wear; molybdenum disulfide; tungsten disulfide; hexagonal boron nitride; soft metals; copper;

    Sammanfattning : The tribological and mechanical properties are of great importance for a material’s lifetime, since it is highly dependent on these two factors. The purpose of this report was to examine suitable solid lubricants for Erasteel, a company that manufactures hot isostatic pressed high speed steels, that will enhance the tribological properties of their steels without worsening the mechanical properties. LÄS MER

  3. 12. Study of the Optical Properties of sp2-Hybridized Boron Nitride

    Master-uppsats, Linköpings universitet/Tillämpad optik

    Författare :Eduardo Antunez de Mayolo; [2014]
    Nyckelord :Spectroscopic ellipsometry; boron nitride; optical properties; materials characterization; III-V nitride semiconductors; cathodoluminescence; electron microscopy; Raman spectroscopy;

    Sammanfattning : Nitride-based semiconductor materials make it possible to fabricate optoelectronic devices that operate in the whole electromagnetic range, since the band gaps of these compounds can be modified by doping. Among these materials, the sp2-hybridized boron nitride has properties that make it a potential candidate for integration in devices operating in the short-wavelength limit, under harsh environment conditions, due to the strength of the B-N bond. LÄS MER

  4. 13. Development of a Kinetic Monte Carlo Code

    Kandidat-uppsats, Materialteori

    Författare :Daniel Pedersen; [2013]
    Nyckelord :kinetic monte carlo graphene boron nitride diffusion lattice kmc;

    Sammanfattning : A framework for constructing kinetic monte carlo (KMC) simulations of diffusive events on a lattice was developed. This code was then tested by running simulations of Fe adatom diffusion on graphene and graphene-boron nitride surfaces. LÄS MER

  5. 14. Method for determining phasedistribution and characteristic lenghts in cBN-composite materials.

    Uppsats för yrkesexamina på avancerad nivå, Institutionen för kemi - Ångström

    Författare :Olof Gunneriusson; [2013]
    Nyckelord :cBN; characteristic lenght; SEM; phase distribution;

    Sammanfattning : An image analysis method has been developed for Sandvik to determine phasecompositions and characteristic length of the binding phase in cubic Boron Nitride(cBN)-composites with low contents of cBN (35-75%).The method consists of taking pictures with a Scanning Electron Microscope,gathering elemental data with X-ray Diffraction (XRD) as well as Energy-dispersiveX-ray Spectroscopy (EDS) and finally using a Matlab program developed for this workto calculate phase compositions and statistical data from the characteristic length ofthe binding phase. LÄS MER

  7. 15. Precipitation Study in a High Temperature Austenitic Stainless Steel using Low Voltage Energy Dispersive X-ray Spectroscopy

    Master-uppsats, KTH/Materialens processteknologi

    Författare :Ali Gharehbaghi; [2012]
    Nyckelord :austenitic stainles steel; precipitation; EDS; low voltage EDS; micron-scale precipitates; sub-micron intragranular precipitates;

    Sammanfattning : Precipitation of second phase particles is a key factor dominating the mechanical properties of high temperature alloys. In order to control and optimize the precipitation effect it is of great importance to study the role of alloying elements in the formation and stability of precipitates. LÄS MER