Blar i Institutt for materialteknologi på utgivelsesdato
Viser treff 101-120 av 2534
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Synthesis of textured KxNa1-xNbO3 materials
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:124, Doctoral thesis, 2010)Lead-free piezoelectric and ferroelectric materials have recently gained increasing attention driven by the latest legislation to phase out the state of the art family of materials based on PbZrxTi1-xO3 (PZT). Alkali-niobate ... -
Recycling of automotive aluminum
(Journal article; Peer reviewed, 2010)With the global warming of concern, the secondary aluminum stream is becoming an even more important component of aluminum production and is attractive because of its economic and environmental benefits. In this work, ... -
Ore melting and reduction in silicomanganese production
(Journal article; Peer reviewed, 2010)The charge for silicomangansese production consists of manganese ore (often mixed with ferromanganese slag) dolomite or calcite, quartz, and in some cases, other additions. These materials have different melting properties, ... -
Microstructure and texture characteristics of ZK60 Mg alloy processed by cyclic extrusion and compression
(Journal article; Peer reviewed, 2010)The microstructure and crystallographic texture characteristics of an extruded ZK60 Mg alloy subjected to cyclic extrusion and compression (CEC) up to 8 passes at 503 K were investigated. The local crystallographic texture, ... -
Effect of Composition and Thermomechanical Processingon The Intergranular Corrosion of AA6000 Aluminium Alloys
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:116, Doctoral thesis, 2010)In order to achieve the desired strength, AlMgSi (6000-series) alloys are often alloyed with either small (fraction of a wt%) Cu or excess (in relation to that required to form Mg2Si) amounts of Si. Both approaches can ... -
THE CURRENT EFFICIENCY FOR ALUMINIUM DEPOSITION FROM CRYOLITEALUMINAMELTS AT HIGH CURRENT DENSITY
(Master thesis, 2010)A laboratory study was performed to investigate first and foremost the effects of cathodic current density on the current efficiency with respect to aluminium electrolysis in cryolite-aluminamelts. Effects of NaF/AlF3 ratio ... -
Degradation of Cathode Lining in Hall-Héroult Cells
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:241, Doctoral thesis, 2010)The aluminium industry is continually facing the problem to lower the energy consumption and to increase the productivity by improving the current high amperage cell technology. Another challenge is to eliminate cell ... -
Electrocatalysis of the Oxygen Evolution Reaction: A Comparative Study of Anodically Formed and Nanostructured Iridium Oxides
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:26, Doctoral thesis, 2010)The thesis deals with electrocatalysts for the oxygen evolution reaction for proton-exchange membrane (PEM) water electrolysis. Water electrolysis is considered the only viable option for large-scale hydrogen production. ... -
Special nanostructures in Al-Mg alloys subjected to high pressure torsion
(Journal article; Peer reviewed, 2010)Deformation twins and stacking faults were observed in nanostructure Al-Mg alloys subjected to high pressure torsion. These observations are surprising because deformation twinnings have never been observed in their ... -
Processing and Properties of Direct Reduced Iron Pellets Containing Material for Control of Steel Structure
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:42, Doctoral thesis, 2010)The thesis work was carried out at the Department of Materials Science and Engineering in Norwegian University of Science and Technology (NTNU) and in SINTEF. It is a part of a SINTEF /NTNU project called Dispersoids in ... -
Aging of Si3N4-bonded SiC Sidewall Materials in Hall-Héroult Cells: Material Characterization and Computer Simulation
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:229, Doctoral thesis, 2010)Si3N4-bonded SiC materials have become the state-of-the-art sidewall block materials used in aluminium electrolysis cells. Despite its outstanding properties, the material properties degradate in the cell over time. The ... -
Karakterisering av aluminium ekstrudert med ulike skruegeometrier
(Master thesis, 2010)Hydro Aluminium har i samarbeid med IMT ved NTNU utviklet og patentert en ny måte å ekstrudere aluminium på. Metoden minner om prinsipp som er mye brukt blant annet i plastindustrien, nemlig skrueekstrudering. I denne ... -
Microstructure evolution of commercial pure titanium during equal channel angular pressing
(Journal article; Peer reviewed, 2010)The microstructure development of commercially pure titanium during 3 and 4 passes of equal channel angular pressing (ECAP) has been investigated in detail by optical microscopy and electron backscattered diffraction (EBSD). ... -
Increasing the Lifetime of PEM Fuel Cells:: A Characterization of some Degradation Mechanisms
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:91, Doctoral thesis, 2010)A segmented PEM fuel cell has been applied to measure spatial differences in key properties (polarization curves, electrochemical area and membrane resistance) of a fuel cell. The cell, consisting of 10 segments, was ... -
Degreasing of aluminum turnings and implications for solid state recycling
(Chapter, 2010)With the global warming being of concern, recycling of aluminum by new solid-state recycling techniques instead of conventional remelting and subsequent refining processing has been taken into account. Solid-state recycling ... -
Hydrogen Porosity in Al-Si Foundry Alloys
(Doktoravhandlinger ved NTNU, 1503-8181; 2010:3, Doctoral thesis, 2010)Aluminium alloys based on the aluminium-silicon system are popular for automotive and aerospace applications, thanks to their high strength to weight ratio, excellent castability, and corrosion resistance. Microporosity ... -
Faceted interfacial structure of {1011} twins in Ti formed during equal channel angular pressing
(Journal article; Peer reviewed, 2010)The boundary structure of {1011} deformation twins formed in commercial pure titanium (CP-Ti) during the initial pass ECAP processing has been studied by TEM and HRTEM. A new twining mode with twinning dislocation of b3/3, ... -
Alternating Current Corrosion of Carbon Steel
(Master thesis, 2011)The objective was to investigate if the established theory concerning corrosion calculations and electrochemical behavior of carbon is valid when steel is exposed to AC in an electrolyte consisting of 3,5 wt% NaCl and ...