Browsing Institutt for materialteknologi by Title
Now showing items 2014-2033 of 2573
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SAG-FW Welding of C90 Riser Steel Connectors
(Master thesis, 2012)Weld simulations have been conducted on a C90 quenched tempered steel used in offshore riser systems, in order to investigate the possibility of introducing an effective solid state weld procedure. As a secondary objective, ... -
Sammenligning av kornfinere og elektromagnetiske støpeteknikker for å vurdere materielle ytelser i Al-legeringer
(Bachelor thesis, 2023)Miktrostrukturen til aluminium kan endres ved å tilsette kornfinere, justere størkningsraten og benytte elektromagnetisk røring. Ren kommersiell aluminium (1073) og ren aluminium (99.9999\%) aluminium ble støpt med og uten ... -
Sammensetning, struktur og variasjon av tappeslagg fra silisium produksjon
(Bachelor thesis, 2024)Slagget som dannes i ovnen er et biprodukt av silisiummetallproduksjonen og betraktes som «avfall». Analysen av tappeslagget kan gi verdifull innsikt i de pågående prosessene i ovnen. Slagget består hovedsakelig av urenheter ... -
Sampling Procedure, Characterization, and Quantitative Analyses of Industrial Aluminum White Dross
(Peer reviewed; Journal article, 2022)Up to 10% of all metallic aluminum (Al) produced is lost due to dross generation during production. It also causes an environmental problem due to hazardous waste generation following treatment, as well as toxic gas ... -
Sandblasting effect on performance and durability of Ti based IrO2 –Ta2O5 anode in acidic solutions
(Journal article; Peer reviewed, 2018)The effect of applying sandblasting during pretreatment while preparing titanium based IrO2 – Ta2O5 anodes by the conventional method was investigated. It was observed that sandblasting influences the surface morphology ... -
Scale Formation Inside Steel Pipes - Solubility of Calcium Sulfate
(Master thesis, 2024)Sjøvann, med sine mange oppløste salter, kan danne faste avleiringer, såkalt scale, på utstyrsoverflater. Avleiringer kan føre til betydelige driftsproblemer i olje- og gassindustrien, for eksempel tilstopping av brønner. ... -
Scale-up of Sonochemical Synthesis of Nanocatalysts for Fuel Cells and Electrolyzers
(Master thesis, 2023)Hensikten med dette arbeidet var å oppskalere en sonokjemisk synteserute ved bruk av en 346 kHz ultralyd platetransduser for å produsere Pt/XC72 med reproduserbare egenskaper, og høy katalytisk aktivitet for oksygenreduk ... -
Scaling in the Si Off-gas Systems - The Effect of Alkali Content
(Master thesis, 2022)Hensikten med denne masteren har vært å undersøke komposisjonen av avsetningen som finnes i pipen på silisiums og ferrosilisiums verk. Resultatet vil kunne brukes til å oppnå en bedre forståelse av hvilke faktorer som ... -
Screw Extrusion from various Binary Al-XMg Feed Materials - Effects of Heat Treatment on Microstructure
(Master thesis, 2016)Three direct chill (DC) cast aluminium-magnesium (Al-Mg) alloys, with 5, 8, and 10 wt% magnesium, have been used as base materials. These base materials were either rapidly solidified by melt spinning, or granulated by ... -
Screw Extrusion of Light Metals: Development of materials, characterization and process analysis
(Doctoral theses at NTNU;2018:218, Doctoral thesis, 2018)The presented work highlights the possibilities inherent in a new method for continuous extrusion, i.e. hereafter named metal continuous screw extrusion (MCSE). This was done by expanding the knowledge of the process itself, ... -
Secondary Hardening in Two Supermartensitic Stainless Steels
(Master thesis, 2012)Since the late nineties weldable supermartensitic stainless steels (SMSS) has been used in subsea flowlines, and more than 400 km is installed. Hydrogen related problems in the weld fabrication stage or hydrogen induced ... -
Seebeck coefficients of cells with lithium carbonate and gas electrodes
(Journal article; Peer reviewed, 2015)The Seebeck coefficient is reported for thermoelectric cells with gas electrodes and a molten electrolyte of one salt, lithium carbonate, at an average temperature of 750 °C. We show that the coefficient, which is 0.88 mV ... -
Seebeck coefficients of cells with molten carbonates relevant for the metallurgical industry
(Journal article; Peer reviewed, 2015)We report Seebeck coefficients of electrochemical cells with molten carbonate mixtures as electrolytes and carbon dioxide|oxygen electrodes. The system is relevant for use of waste heat and off-gases with concentration of ... -
Segregation of Mg, Cu and their effects on the strength of Al S5 (210) [001] symmetrical tilt grain boundary
(Journal article; Peer reviewed, 2018)Alien elemental segregation can pronouncedly change the grain boundary properties. Systematic first-principles calculations were performed to investigate the Mg and Cu segregation behavior at Σ5 (210)[001] symmetrical tilt ... -
Selective Vacuum Evaporation by the Control of the Chemistry of Gas Phase in Vacuum Refining of Si
(Peer reviewed; Journal article, 2021)The evaporation of P from liquid Si under vacuum and reduced pressures of H2, He, and Ar was studied to evaluate the feasibility of effective P removal with insignificant Si loss. It was found that the introduction of Ar ... -
Selectivity of nanocrystalline Iro2-based catalysts in parallel chlorine and oxygen evolution
(Journal article; Peer reviewed, 2015)Nanocrystalline electrocatalysts with chemical composition corresponding to Ir1 − xMxO2 (M = Co, Ni, and Zn, 0.05 ≤ x ≤ 0.2) were prepared by the hydrolysis of H2IrCl6·4H2O solutions combined with nitrates and acetates of ... -
Self-Poling and Ageing in PZT Thin Films With Interdigitated Electrodes - Work done at Laboratoire de Céramique (LC), EPFL
(Master thesis, 2015)This work details advances in thin-film lead zirconate titanate (PZT) devices with interdigitated electrodes (IDEs). They are interesting for energy harvesting applications, as they can provide small amounts of electrical ... -
Self-propagating high-temperature synthesis of zirconium disilicide
(Master thesis, 2020)I denne oppgaven ble en selv-utviklet reaktor som benyttet en Mg-BaO2 antennelsesblanding i en rørovn bruk til SHS av ZrSi2. Litteratur om forbrenningssyntese, zirkonium, silisium og Zr-Si systemet ble studert for å etablere ... -
Semi-solid Constitutive Parameters and Failure Behavior of a Cast AA7050 Alloy
(Journal article; Peer reviewed, 2021)AA7050 is an aluminum alloy with superior mechanical properties; however, it is prone to hot tearing (HT) during its production via direct-chill casting. This study focuses on extracting constitutive parameters of the alloy ... -
Shape Factor Effect on Inclusion Sedimentation in Aluminum Melts
(Journal article; Peer reviewed, 2020)The quality requirements of aluminum products are steadily increasing, and the presence of non-metallic inclusions have a large impact on the quality of aluminum products. Sedimentation is a widely applied technique to ...