Browsing Institutt for materialteknologi by Subject "TECHNOLOGY: Materials science"
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A Study of Localized Corrosion in Supermartensitic Stainless Steel Weldments
(Dr.ingeniøravhandling, 0809-103X; 2002:72, Doctoral thesis, 2002)This doctoral thesis is concerned with pitting corrosion in super martensitic stainless steel (SMSS) weldments in slightly sour service. Thee main objective with the present thesis has been to find out why pitting corrosion ... -
Alstruc' - en modell for størkning og varmebehandling av industrielle aluminiumlegeringer.
(Doctoral thesis, 2003)The thesis consists of a summary, and 11 papers. Part 6 in the summary includes a list of who did what in papers with several authors. The summary: The summary gives a short survey of 'Alstruc', and examples of calculations ... -
Ammonia as Hydrogen Carrier. Effects of Ammonia on Polymer Electrolyte Membrane Fuel Cells
(Doktoravhandlinger ved NTNU, 1503-8181; 2004:25, Doctoral thesis, 2004) -
Behaviour of iron and titanium species in cryolite-alumina melts
(Dr.ingeniøravhandling, 0809-103X; 2000:118, Doctoral thesis, 2000)The solubility of divalent iron oxide in cryolite-based melts was studied. Both electrochemical and chemical techniques were employed. To ensure that only divalent iron was present in solution, the melt was contained in ... -
Deformation and Softening behaviour of commercial AlMn-alloys: Experiments and Modelling
(Dr. ingeniøravhandling, 0809-103X; 2003:82, Doctoral thesis, 2003)A comprehensive study of the softening behaviour of two different non-heat treatable AlMn-alloys has been carried out. These alloys were a laboratory processed and an industrially processed AA3103-alloy. The primary objective ... -
Determination of Oxygen Transport Coefficients in Perovskites and Perovskite related Materials with mixed Conductivity
(Doktoravhandlinger ved NTNU, 1503-8181; 2005:191, Doctoral thesis, 2005)Perovskites and perovskite related materials are materials that are candidates for applications such as oxygen permeable membranes, cathodes for SOFC and high-temperature oxygen sensors. This arises from the potential high ... -
Electrochemical Characterization of Melt Spun AB5 Type Alloys for Metal Hydride Batteries
(Dr. ingeniøravhandling, 0809-103X; 2003:45, Doctoral thesis, 2003)This thesis is part of a larger research project where two metal hydride forming AB5 type alloys have been investigated. A slightly non-stoichiometric alloy with mischmetal on A-site and nickel, cobalt, manganese and ... -
Electrochemical Oxidation of Methanol and Formic Acid in Fuel Cell Processes
(Doktoravhandlinger ved NTNU, 1503-8181; 2005:204, Doctoral thesis, 2005)The main objectives of the thesis work were: (1), to study the oxidation of methanol and formic acid on platinum electrodes by employing conventional and advanced electrochemical methods, and (2), to develop membrane ... -
Flow and Heat Transfer in a Radially Spreading Liquid Metal Jet Related to Casting of Ferroalloys
(Dr. ingeniøravhandling, 0809-103X; 2000:83, Doctoral thesis, 2000)In the past more and more advanced and fine-tuned processes for steel production have resulted in increased demands for new and more costeffective ferroalloys used as constituents in the processes. Casting techniques and ... -
High Pressure Die Casting of Aluminium and Magnesium Alloys: Grain Structure and Segregation Characteristics
(Doktoravhandlinger ved NTNU, 1503-8181; 2004:57, Doctoral thesis, 2004)Cold chamber high pressure die casting, (HPDC), is an important commercial process for the production of complex near net shape aluminium and magnesium alloy castings. The work presented in the thesis was aimed at investigating ... -
Liquidus relations and thermochemistry within the system Fe-Mn-C-O
(Dr. ingeniøravhandling, 0809-103X; 2000:126, Doctoral thesis, 2000)The ever-growing competition in the bulk material industry is increasingly a battle between branches of materials producers rather than within each branch. In this climate, an enduring competitiveness relies on continous ... -
Mechanical Properties and Phase Stability of Oxygen Permeable Membranes La0.5Sr0.5Fe1-xCoxO3-δ
(Doktoravhandlinger ved NTNU, 1503-8181; 2005:51, Doctoral thesis, 2005)Ceramic membranes made from mixed oxygen-ionic and electronic conducting perovskite oxides can selectively separate oxygen from air at elevated temperatures. These membranes have several potential applications that require ... -
Meniscus Dynamics in Aluminium Extrusion Ingot Casting
(Dr. ingeniøravhandling, 0809-103X; 2002:57, Doctoral thesis, 2002)In the modern process of continuous Direct Chill (DC) hot top casting of aluminium extrusion ingot with gas slip, poor surface quality of the cast ingot can still be a problem. In the worst cases pronounced surface wrinkling ... -
Microstructures and Properties of Aluminium-Magnesium Alloys with Additions of Manganese, Zirconium and Scandium
(Dr. ingeniøravhandling, 0809-103X; 2000:12, Doctoral thesis, 2000)The present work reports on the effect of Mn-, Zr- and Sc-additions upon hot deformation properties, recrystallization properties and mechanical properties for different temper conditions of Al-Mg alloys. It can be stated ... -
Physual Designing - A Supportive Framework for Dispersed Engineering Design
(Dr. ingeniøravhandling, 0809-103X; 2003:56, Doctoral thesis, 2003)Corporations involved in engineering design face multiple challenges; collaboration in complex, geographically dispersed value chains, increasing pressure to reduce lead times to improve their competitive positions, and ... -
Precipitation behaviour and recrystallisation resistance in aluminum alloys with additions of hafnium, scandium and zirconium
(Doktoravhandlinger ved NTNU, 1503-8181; 2005:145, Doctoral thesis, 2005)The overall objective of this work has been to develop aluminium alloys, which after hot and cold deformation are able to withstand high temperatures without recrystallising. This has been done by investigating aluminium ... -
Reaction kinetics for reduction of manganese ore with carbon monoxide in the presence of carbon
(Dr. ingeniøravhandling, 0809-103X; 2002:135, Doctoral thesis, 2002)In the production of ferromanganese the gas-solid reactions taking place in the furnace shaft (the so-called pre-reduction zone, where higher manganese oxides in the manganese ore are reduced to MnO) are to a large extent ... -
Remelting of Aluminium by Continuous Submersion of Rolled Scrap
(Dr. ingeniøravhandling, 0809-103X; 2000:127, Doctoral thesis, 2000)When remelting aluminium scrap, metal losses due to dross generation is a common problem. Reduction of these losses will give substantial economic and environmental benefits. Dross is generated when aluminium metal oxidizes ... -
Silicon for Solar Cells
(Doktoravhandlinger ved NTNU, 1503-8181; 2004:140, Doctoral thesis, 2005)This thesis work consists of two parts, each with a different motivation. Part II is the main part and was partly conducted in industry, at ScanWafer ASA’s plant no.2 in Glomfjord. The large growth in the Photo Voltaic ... -
Sodium expansion and creep of cathode carbon
(Dr. ingeniøravhandling, 0809-103X; 2003:44, Doctoral thesis, 2003)An apparatus to measure compressive creep in carbon materials has been developed. Using the final experimental set-up five material properties could be measured in each electrolysis experiment. Creep, sodium expansion, ...