Browsing Institutt for materialteknologi by Issue Date
Now showing items 1201-1220 of 2540
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Furnace Atmosphere and Dissolved Hydrogen in Aluminium
(Peer reviewed; Journal article, 2019)Hydrogen solubility is much higher in liquid than in solid aluminium. Therefore, if the hydrogen concentration in liquid aluminium is too high prior to solidification, there is high risk of gas porosity formation during ... -
Work hardening and Portevin-Le Chatelier (PLC) effect in aluminium alloys
(Master thesis, 2019)Bruk av enkelte Al-Mg-legeringer kan føre til utfordringer. Innenfor visse tøyningshastigheter og temperaturer kan det oppstå overflatefeil og tap av mekaniske egenskaper. Dette på grunn av Portevin-Le Chatelier-effekten. ... -
Chemical Durability of Thermal Insulating Materials in Hall-Héroult Electrolysis Cells
(Journal article; Peer reviewed, 2019)The most common thermal insulating materials used in the cathode lining in aluminum electrolysis cells are Moler (diatomaceous earth), calcium silicate, or vermiculite based materials. The thermal insulation layer is ... -
Thermoelectric properties of non-stoichiometric CaMnO3-d composites formed by redox-activated exsolution.
(Journal article; Peer reviewed, 2019)A novel synthesis route for preparing well-defined composites based on CMO (CaMnO3) has been established taking advantage of the unique phase relations in the system Ca-Mn-O at reducing- and oxidizing atmosphere, respectively. ... -
Anti-icing coatings based on graphene oxide additions; preparation and characterization
(Master thesis, 2019) -
Characterization of a Si-SiO2 mixture generated from SiO and CO
(Journal article; Peer reviewed, 2019)The reaction between SiO(g) and CO(g) is a relevant intermediate reaction in the silicon production process. One of the products generated from this gas mixture is called by its color, brown condensate. In this paper, ... -
Electrostatic potential mapping at ferroelectric domain walls by low-temperature photoemission electron microscopy
(Journal article; Peer reviewed, 2019)Low-temperature X-ray photoemission electron microscopy (X-PEEM) is used to measure the electric potential at domain walls in improper ferroelectric Er0.99Ca0.01MnO3. By combining X-PEEM with scanning probe microscopy and ... -
Pelletering av fiberslam for biokarbon og impregnering av pellets med bioolje
(Bachelor thesis, 2019) -
On the ballistic perforation resistance of additive manufactured AlSi10Mg aluminium plates
(Journal article; Peer reviewed, 2019)Materials and structures made through additive manufacturing (AM) have received a lot of attention lately due to their flexibility and ability to customize structural components of complex geometry. One range of application ... -
Local structural coupling of A- and B-site disorder in perovskite bismuth-based piezoelectrics
(Journal article; Peer reviewed, 2019)The local and average structure of (1-x)Bi0.5K0.5TiO3-xBiFeO3 (BKT-xBFO, x = 0.25 and 0.5) solid solutions are studied by synchrotron X-ray total scattering from ambient to 773 K. Pair distribution functions (PDFs) demonstrate ... -
Kinetic study of vacuum evaporation of elements from ternary melts; case of dilute solution of P in Si-Al melts
(Journal article; Peer reviewed, 2019)This research is devoted to study phosphorus removal from Si-Al alloys by vacuum refining of the ternary system of dilute solutions of P in Si-20 wt%Al. The experiments were carried out in an induction furnace and after ... -
Rheological Characterization of Pitch and Binder Matrix with Different Concentrations of Fine Particles
(Journal article, 2019)Green anodes consist of coarse coke particles surrounded by a binder matrix, which is a viscoelastic material and is made of fine coke particles and coal-tar pitch. During the compaction process, the coarse particles ... -
An EXAFS and XANES Study of V, Ni, and Fe Speciation in Cokes for Anodes Used in Aluminum Production
(Journal article; Peer reviewed, 2019)Lower-quality petroleum coke with higher levels of sulfur and metal impurities will have to be used for the manufacturing of anodes for aluminum production in the future. The sulfur and metallic impurities affect the anode ... -
Degradation of Refractory Lining in Carbon Anode Baking Furnaces
(Doctoral theses at NTNU;2019:340, Doctoral thesis, 2019)Primary aluminium metal is produced by electrochemical reduction of Al2O3 at ~960 ºC, during which large amounts of carbon anodes are consumed. The anodes are thus constituting an important part of the production process. ... -
Convection induced by illumination-based metal surface heating increases corrosion potential, corrosion rates
(Journal article; Peer reviewed, 2019)Illumination may increase corrosion rates of important engineering metals. In addition to the well-known photoelectrochemical mechanism which increases dissolution via generation of electron-hole pairs, induced convection ... -
Comparison of Surface Tension Models for the Volume of Fluid Method
(Journal article; Peer reviewed, 2019)With the increasing use of Computational Fluid Dynamics to investigate multiphase flow scenarios, modelling surface tension effects has been a topic of active research. A well known associated problem is the generation of ... -
Development of An Asymmetrical Membrane for Oxygen Exchange and Production
(Master thesis, 2019)Hvert år produseres over 100 millioner tonn ren oksygengass, der mesteparten produseres ved frysedestillering. Denne formen for oksygenproduksjon krever mye tilført energi, og den er derfor ikke godt egnet til å dekke den ... -
Measuring In Situ Interfacial Contact Resistance in a Proton Exchange Membrane Fuel Cell
(Journal article; Peer reviewed, 2019)Interfacial contact resistance (ICR) is one of the remaining hurdles for successful implementation of stainless steel bipolar plates in PEM fuel cells. We have developed a reliable method, using thin gold wires, to measure ... -
Characterisation of an aluminium matrix nanocomposite wire manufactured by screw extrusion
(Master thesis, 2019)Kontinuerleg skrueekstrusjon av metaller (Metal Continuous Scew Extrusion, MCSE) er ein nyutvikla, fast tilstands produksjonsmetode, som tilrettelegg for framstilling av metallegeringar og komposittar med nye eigenskapar. ... -
Accelerated recrystallization by electric current flash heating in cold-rolled Al-5Cu alloy under the influence of concurrent precipitation
(Journal article; Peer reviewed, 2019)The influence of flash heating by using a continuous direct current on the recrystallization behavior of an Al-5Cu alloy under the influence of concurrent precipitation of Al2Cu precipitates has been investigated. In ...