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Behaviour of nickel, iron and copper by application of inert anodes in aluminium production
(Dr. ingeniøravhandling, 0809-103X; 2000:104, Doctoral thesis, 2000)
A thorough investigation was performed on the behaviour of Ni, Fe and Cu oxides dissolved in cryolite melts, and the solubility of these species was measured as a function of alumina content, NaF/AlF3 molar ratio (CR) and ...
Thermal Reactivity and Structure of Carbonized Binder Pitches
(Doktoravhandlinger ved NTNU, 1503-8181; 2005:83, Doctoral thesis, 2005)
Pitches are used on a large scale in the manufacture of carbon anodes for the production of primary aluminium. The role of the pitch is to act as a binder between the petroleum coke grains. The structure of the carbonized ...
Evolution of Alpha Phase Alumina in Agglomerates upon Addition to Cryolitic Melts
(Dr. ingeniøravhandling, 0809-103X; 2002:50, Doctoral thesis, 2002)
Rapid dissolution of alumina upon addition to the cryolitic melt is crucial for the modern Hall-Heroult process for aluminium production. The formation of slow - dissolving alumina agglomerates may be detrimental, and ...
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 ...
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 ...
Ammonia as Hydrogen Carrier. Effects of Ammonia on Polymer Electrolyte Membrane Fuel Cells
(Doktoravhandlinger ved NTNU, 1503-8181; 2004:25, Doctoral thesis, 2004)
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 ...
A new dynamic void Growth Model
(Doktoravhandlinger ved NTNU, 1503-8181; 2004:118, Doctoral thesis, 2004)
This work develops a new void growth model which is capable of describing the deformation and fracture of ductile materials under dynamic loading conditions. A representative volume element (RVE) which consists of a ...
Improving Environmental Performance of Industrial Products through Product Service Systems
(Dr. ingeniøravhandling, 0809-103X; 2001:45, Doctoral thesis, 2001)
This dissertation deals with the unintended sideeffects of utilizing resources and causing environmental load. The intention of this report is to contribute to a leap improvement in enviornmental performance of industrial ...
Computer Simulation of Residual Stress and Distortion of Thick Plates in Multielectrode Submerged Arc Welding: Their Mitigation Techniques
(Dr. ingeniøravhandling, 0809-103X; 2001:75, Doctoral thesis, 2001)
Welding is the main joining method used in shipbuilding. A multi-electrode submerged arc welding is usually applied to long joints of massive components since the early 1950s. The problem of welding stresses and deformations ...