Blar i Institutt for materialteknologi på tittel
Viser treff 1663-1682 av 2519
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Orthorhombic-tetragonal phase transition induced by Ta isovalent doping and its effect on fatigue characteristics of KNL-NSTx ceramics
(Journal article; Peer reviewed, 2018)The effect of Ta addition on the bipolar fatigue characteristics of lead-free KNL-NSTx ceramics (x = 0, 0.04, 0.07 and 0.11 mol%) is studied. Bipolar cycling up to 1 × 106 cycles leads to strong degradation of the polarization ... -
An Overall Furnace Model for the Silicomanganese Process
(Journal article; Peer reviewed, 2021)An overall model for a pilot-scale silicomanganese furnace that simultaneously considers electrical and thermal conditions, process chemistry, and flow of solid and liquid substances. -
Overflatebehandling av aluminiumslegering og kompatibilitet med hydrogenperoksid for romapplikasjoner
(Bachelor thesis, 2022)Nammo har fått en kontrakt som innebærer utvikling av styresystemet Roll and Attitude Control System (RACS) for bæreraketten VEGA-E til European Space Agency (ESA). Styresystemets drivstoffbeholder er av aluminium med ... -
Overflatebehandling av aluminiumslegering og kompatibilitet med hydrogenperoksid for romapplikasjoner
(Bachelor thesis, 2022)Nammo har fått en kontrakt som innebærer utvikling av styresystemet Roll and Attitude Control System (RACS) for bæreraketten VEGA-E til European Space Agency (ESA). Styresystemets drivstoffbeholder er av aluminium med ... -
An Overview of Currently Applied Ferrochrome Production Processes and Their Waste Management Practices
(Peer reviewed; Journal article, 2023)Ferrochrome (FeCr) is the main source of virgin chromium (Cr) units used in modern-day chromium (Cr) containing alloys. The vast majority of produced Cr is used during the production of stainless steel, which owes its ... -
Overview of the Possibilities and Limitations of the Characterization of Ceramic Foam Filters for Metal Melt Filtration
(Journal article; Peer reviewed, 2021)The filtration of molten metal using ceramic foam filters (CFF) is a purification method often used by the aluminum industry to meet the increasing demands the melt quality. CFFs are in most cases produced by the replica ... -
Oxidation and fume formation during production of Si and Mn-based alloys
(Doctoral theses at NTNU;2018:313, Doctoral thesis, 2018)Thermally generated fumes from the production process of manganese ferroalloys are generated due to the reaction between high temperature liquid- or metal vapor and ambient oxygen in the air, and are mostly composed of ... -
Oxidation and Fume Formation from Liquid Silicomanganese Alloys Exposed to Atmospheres Containing Moisture
(Peer reviewed; Journal article, 2022)In industrial applications and laboratory studies, it has been shown that the use of water spray may significantly reduce the amount of fume generated from the oxidation process of liquid high carbon ferromanganese alloy. ... -
Oxidation driven decomposition of CeNbO4 in pure oxygen
(Journal article; Peer reviewed, 2008)CeNbO4 possess oxygen hyper-stoichiometry at ambient and moderate temperature. At elevated temperature CeNbO4+δ is thermally reduced to near stoichiometric CeNbO4 accompanied by a structural phase transition. Above the ... -
Oxidation Kinetics of Nanocrystalline Hexagonal RMn<inf>1-x</inf>Ti<inf>x</inf>O<inf>3</inf> (R = Ho, Dy)
(Journal article; Peer reviewed, 2023) -
Oxidation of Al-Mg alloys in small scale experiments
(Research report, 2019)While a significant amount of work has been done on the oxidation of Al-Mg alloys a limited portion of the work has been done under a true furnace atmosphere created by an air-fuel or oxyfuel burner. A series of oxidation ... -
Oxidation of Liquid Silicon in a Medium Scale Induction Furnace: Examination of the Fuming Rate and Fume Composition
(Master thesis, 2012)The aim of this work was to study the effect of flow rate on the fuming rate/silica flux of liquid silicon in order to gain a better understanding of the silica fuming during industrial ladle refining during silicon ... -
Oxidation of Liquid Silicon in Air Atmospheres Containing Water Vapor
(Peer reviewed; Journal article, 2019)The oxidation of silicon (Si) has been extensively investigated over the past 50 years. Yet, an understanding of the mechanism and rate of liquid Si oxidation in atmospheres containing water vapor, is lacking. The effect ... -
Oxidation of Manganese-Containing Aluminium Alloys: Oxidation of Molten Mn-Containing Al Alloys in Various Atmospheres
(Master thesis, 2013)An oxidation study was performed on 99.99% Al, Al1%Mn and Al5%Mn materials, both ina thermogravimetric furnace, and in a muffle furnace. The mass gain behaviour for thesematerials was studied and compared for dierent ... -
Oxidation of silicon in aqueous media
(Master thesis, 2011)Silicon is used in the production of various ceramic products. As the solar industry is advancing, the need for reusable crucibles for the casting of solar grade silicon has arisen. One idea is to produce silicon nitride ... -
Oxidation of silicon powder in humid air
(Master thesis, 2012)Silicon undergoes oxidation at room temperature, causing a formation of an oxide layer on its surface. Gaining knowledge about the oxide layer formed during ageing, is valuable with regards to production of high quality ... -
Oxidation-Enhanced Evaporation in High-Carbon Ferromanganese
(Peer reviewed; Journal article, 2021)Lifetime and reliability in realistic operating conditions are important parameters for the application of thin-film piezoelectric microelectromechanical systems (piezoMEMS) based on lead zirconate titanate (PZT). Humidity ... -
Oxidative Ladle Refining of Metallurgical Grade Silicon: Refining of Ca and Al Impurities
(Doctoral theses at NTNU;2021:277, Doctoral thesis, 2021)English summary Metallurgical grade silicon (MG-Si) is used as an alloying agent, raw material, or as a precursor compound, in the production of aluminum alloys, silicones, photovoltaics, and electronics. Access to ... -
Oxidative Refining of Metallurgical Grade Silicon: Lab-Scale Measurements on the Overarching Refining Behavior of Ca and Al
(Peer reviewed; Journal article, 2022)Oxidative ladle refining (OLR) is the most widely used refining process for removal of dissolved Ca and Al in the industrial production of metallurgical grade silicon (MG-Si). Refining occurs by purging the silicon alloy ... -
Oxide Hydrogen Interaction and Porosity Development in Al-Si Foundry Alloys
(Master thesis, 2011)The oxide level of an A356 aluminium alloy will be controlled by (i) melting, casting and remelting A356 aluminium alloy for increasing the bi-films levels in the melt, and by (ii) additions of an extruded aluminium oxide ...