Browsing Institutt for materialteknologi by Subject "VDP::Teknologi: 500::Materialteknologi: 520"
Now showing items 1-20 of 44
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Atom probe tomography investigations of aging of Al-Zn-Mg(-Cu) alloys during room temperature storage or by cyclic plasticity
(Doctoral theses at NTNU;2022:369, Doctoral thesis, 2022)Aluminum alloys containing zinc, magnesium, and copper attain strength by forming nanoparticles during thermal treatments. To generate particles by precipitation, first the alloy has to be heated to about 480°C to dissolve ... -
Cold welding of steel and aluminum alloys - Joining processes, intermetallic phases and bond strength
(Doctoral theses at NTNU;2020:16, Doctoral thesis, 2020)Steel and aluminum are two of the most commonly used metals in today’s society and can be found everywhere, in vehicles, buildings, ships, and in most new electronic devices to name a few. Both metals have desirable ... -
Condensation of SiO and CO in silicon and ferrosilicon production
(Doctoral theses at NTNU;2021:93, Doctoral thesis, 2021)Kondensasjon av SiO(g) er kombinasjon av to reaksjoner i silisiumprosessen. Den første er interaksjonen mellom SiO(g) og CO(g). Den andre er reaksjonen mellom to SiO(g) molekyler. Disse to reaksjonene foregår i lavtemperatursonen ... -
Coupled Transport in Li-ion Battery Electrolytes
(Doctoral theses at NTNU;2024:187, Doctoral thesis, 2024)Electrolytes are materials that contain mobile charge carriers – ions. The electrolyte in lithium-ion batteries enables the transport of positive Li+ ions in between the electrodes during battery operation. The transport ... -
Defect chemistry and ferroelectric domain walls in hexagonal manganites
(Doctoral theses at NTNU;2018:263, Doctoral thesis, 2018)The hexagonal manganites h-RMnO3 (R=Y, In, Sc, Ho-Lu) have been studied the last two decades for their exotic and diverse functional properties. Their large chemical flexibility makes this material class an ideal chemical ... -
Developing high-energy cathodes for Li-ion batteries based on Ni-rich layered oxides
(Doctoral theses at NTNU;2023:443, Doctoral thesis, 2023)Energy storage in rechargeable batteries is essential for implementing more renewable energy into the global energy mix. Batteries can, for instance, be connected to solar or wind energy systems to handle the intermittency ... -
Development and ceramic processing of all-oxide thermoelectric module with direct p-n junction
(Doctoral theses at NTNU;2018:91, Doctoral thesis, 2018) -
Development of Piezoelectric BCZT Ceramics as Electroactive Bone Implant Material
(Doctoral theses at NTNU;2020:148, Doctoral thesis, 2020)The functionalisation of current load-bearing bone implant metals with piezoelectric ceramics is envisioned as a novel opportunity for promoting tissue healing and improving the strength of the bone-implant interface through ... -
Effects of second-phase particles on texture during softening of an Al-Mn alloy investigated by correlative microscopy
(Doctoral theses at NTNU;2024:48, Doctoral thesis, 2024)Aluminium is the second most used metal by weight after iron, and aluminium alloys are some of the most important structural light alloys. Motivated by reducing weight, energy, and cost, many manufacturers are replacing ... -
Electrode paste behaviour in Søderberg electrodes in ferroalloys production
(Doctoral theses at NTNU, 2019:325, Doctoral thesis, 2019)The main goal of this work has been to study the melting behavior of electrode paste used in Søderberg electrodes in ferroalloy production. It has been done by first measuring temperatures in an industrial electrode and ... -
Electronic Property Engineering in a Ferroelectric Oxide: Nanostructuring and Advanced Characterization.
(Doctoral theses at NTNU;2024:102, Doctoral thesis, 2024)The advancement of electronic nanotechnology hinges on the use of innovative materials and new conceptual approaches for devices to meet the demand of miniaturization, energy efficiency, and sustainability. Ferroelectric ... -
Emergent nanoscale functionality in uniaxial ferroelectrics
(Doctoral theses at NTNU;2020:138, Doctoral thesis, 2020)This thesis has been focused on the characterization and manipulation of the electronic nanoscale properties of domains and domain walls in uniaxial ferroelectrics. Two classes of uniaxial ferroelectrics have been investigated, ... -
Experimental and numerical modelling study on the nucleation and grain growth of inoculated aluminium alloys
(Doctoral theses at NTNU;2017:343, Doctoral thesis, 2017)With the aim to achieve an in-depth understanding on the heterogeneous nucleation and grain growth behavior during solidification of inoculated aluminum alloys, an integrated study by in-situ X-radiography, numerical ... -
Feeding of Alumina in Molten Cryolite Bath
(Doctoral theses at NTNU;2023:21, Doctoral thesis, 2023)Alumina is the principal raw-material used for the production of aluminum in the Hall- Héroult process and is fed to the electrolytic bath in batches regularly. Maintaining a stable concentration in the bath is important ... -
Ferromanganese Production from Pretreated Manganese Ores: From Laboratory scale to Pilot scale
(Doctoral theses at NTNU;2023:25, Doctoral thesis, 2023)The production of high carbon ferromanganese (HCFeMn) alloys is an energy intensive process where manganese ores are smelted in a submerged arc furnace (SAF) using carbon reductants thereby generating CO2 emissions. In the ... -
FIB and Functional Ferroics: Structuring and Correlated Microscopy
(Doctoral theses at NTNU;2022:156, Doctoral thesis, 2022)Norsk sammendrag FIB og funksjonelle ferroiske materialer For å fortsette utviklingen av raskere og mer energieffektiv elektronikk er vi nødt til å utnytte nye fysiske fenomener. I dette arbeidet studeres ferroiske ... -
First principles study of epitaxial strain induced phenomena and chemical expansion in perovskite oxides
(Doctoral theses at NTNU;2018:285, Doctoral thesis, 2018)The many exotic properties found in complex oxides have great potential for device applications. Complex oxides within the perovskite structure are particularly attractive, as they display a large diversity of chemical ... -
Flue Gas Recirculation for the Silicon Process
(Doctoral theses at NTNU;2023:135, Doctoral thesis, 2023)Metallurgical-grade silicon is a critical material for modern society. It is used as an alloying agent in aluminium alloys, feedstock for silicones, photovoltaics and electronics. Silicon is produced by carbothermal reduction ... -
Formation and characterization of β-and α-Silicon Carbide produced during Silicon/Ferrosilicon process
(Doctoral theses at NTNU;2020:252, Doctoral thesis, 2020)Silicon carbide (SiC) is one of the main intermediate compounds generated during primary silicon (Si) production in submerged arc furnaces. Carbon materials, either biomass-based (charcoal and wood chips) or based on fossil ... -
Hydrogen embrittlement and corrosion evaluation of Alloy 725 alloyed with B and Cu
(Doctoral theses at NTNU;2023:40, Doctoral thesis, 2023)The need to achieve materials with higher strength and better corrosion resistance results in producing new alloys. Nickel base alloys are among the materials which have been subjected to several studies related to producing ...