Sökning: "spinel oxides"

Visar resultat 1 - 5 av 22 avhandlingar innehållade orden spinel oxides.

  1. 1. Key Aspects of Sintering Powder Metallurgy Steel Prealloyed with Chromium and Manganese

    Författare :Ola Bergman; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Manganese; Prealloyed; Sintering; Mechanical properties; Chromium; Spinel oxide; Powder metallurgy; PM steel; Oxide reduction; Residual oxides; Atmosphere;

    Sammanfattning : The powder metallurgy (PM) process is a cost efficient near net-shape technology suitable for sustainable manufacturing of structural steel components. A drawback with the PM technology is the difficulty to use oxidation sensitive alloying elements, such as Cr and Mn. LÄS MER

  3. 2. Surface Chemical Characteristics of Chromium-alloyed Steel Powder and the Role of Process Parameters during Sintering

    Författare :Dimitris Chasoglou; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; carbothermal reaction; sintering atmosphere; depth profiling; XPS AES; HR SEM EDX; water atomized powder; surface coverage; reduction oxidation; PM steels; sintering; Cr-Mn-spinel oxides; surface oxides;

    Sammanfattning : Powder Metallurgy (PM) is a cost efficient method suitable for sustainable production of structural parts that have strict dimensional tolerances and complex geometries. It has been a common practice to utilize Ni and Cu as alloying elements in PM steels, but the high and fluctuating prices of Ni and the concerns around it associated with health hazards as well as the difficulty in recycling Cu lead the PM industry to search for effective alternatives such as Cr and Mn. LÄS MER

  4. 3. Materials for High-Temperature Catalytic Combustion

    Författare :Anders Ersson; KTH; []
    Nyckelord :catalytic combustion; catalyst materials; palladium; platinum; bimetallic; garnet; spinel; hexaaluminate; deactivation; sulphur; poisoning; diesel; methane; hydrocarbons;

    Sammanfattning : Catalytic combustion is an environmentally friendlytechnique to combust fuels in e.g. gas turbines. Introducing acatalyst into the combustion chamber of a gas turbine allowscombustion outside the normal flammability limits. LÄS MER

  5. 4. Catalytic combustion of gasified waste

    Författare :Henrik Kusar; KTH; []
    Nyckelord :Catalytic combustion; Gasified waste; LHV-fuel; RDF; Biomass; Selective catalytic oxidation; NH3; NOX; Palladium; Platinum; Hexaaluminate; Garnet; Spinel; Deactivation; Sulphur; Poisoning;

    Sammanfattning : This thesis concerns catalytic combustion for gas turbineapplication using a low heating-value (LHV) gas, derived fromgasified waste. The main research in catalytic combustionfocuses on methane as fuel, but an increasing interest isdirected towards catalytic combustion of LHV fuels. LÄS MER

  7. 5. Surface Characteristics of Water Atomized Pre-alloyed Steel Powders and their effect on Sintering

    Författare :Dimitris Chasoglou; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; spinel oxides; sintering; Cr-pre-alloyed powder; reduction; sintering atmosphere; surface oxide; fractography; XPS; oxidation; AES; EDX; carbothermal reaction; SEM; Powder metallurgy;

    Sammanfattning : Powder Metallurgy (PM) is an efficient method, in terms of cost and raw material utilization, for the production of structural parts that have strict dimensional tolerances and complex geometries. In the common processing route, steel powder is fabricated by water atomization and then pressed and sintered into the final component. LÄS MER