Blar i Institutt for materialteknologi på tittel
Viser treff 1715-1734 av 2504
-
Phase Stability and Point Defects in InMnO3
(Master thesis, 2014)During the last decade hexagonal manganites (h-RMNO3) have been a widely researched topic. This is mainly due to their multiferroic property that makes them a potential material for use in future electronics, data storage ... -
Phase transformation in quartz at elevated temperatures
(Peer reviewed; Journal article, 2021)Natural quartz is a raw material in Si production. During heating, it will go through a series of phase transformations before melting in the furnace, from quartz to an intermediate amorphous phase and further to cristobalite. ... -
Phase Transformation Study of X70 Steel by EBSD during In Situ Heating and Quenching
(Master thesis, 2012)Arctic steels, like the API X70 steel explored in this master thesis, are developed to withstand very low temperatures, with a ductile/brittle transition temperature below −60◦C. However, during welding, brittle phases ... -
Phase transformations and thermal degradation in industrial quartz
(Doctoral theses at NTNU;2020:205, Doctoral thesis, 2020)Quartz is used as the silicon source for silicon and ferrosilicon production. Together with various carbon materials, the quartz is added to a submerged arc furnace. Energy is supplied through three carbon electrodes, which ... -
Phase Transformations from Quartz to Cristobalite
(The Minerals, Metals & Materials Series;, Chapter, 2018)Two quartz types used in the silicon and ferrosilicon industry were heated to temperatures of 1600 and 1700 °C. The parameters varied were the temperature and the holding time at maximum temperature. The amount of quartz, ... -
Phase transformations in quartz used in silicon and ferrosilicon
(Peer reviewed; Journal article, 2021)Different quartz types are used as raw material for silicon and ferrosilicon production. Upon heating, the quartz will experience phase transformations to other silica polymorphs. In this study the phase transformation ... -
Phase Transitions and Microstructural Changes During Oxidation and Reduction of a Weathered Ilmenite Concentrate
(Peer reviewed; Journal article, 2021)The present work aims to investigate the link between the oxidation and reduction of a weathered ilmenite concentrate in terms of phase transitions, microstructural changes, and element distribution. An ilmenite concentrate ... -
Phases and Zones in the Silicon Process
(Master thesis, 2016)Different zones and materials formed during the production of silicon in a silicon furnace has been examined in this thesis. Samples from two industrial scale silicon furnaces have been have been studied. The excavations ... -
Phosphorus modification in Al-Si hypereutectic alloys
(Master thesis, 2016)We wanted to know how the primary silicon is influeced by the modification with phoshorus. Some analysis with light microscope were done in order to see how the particles change with the phosphorus modification. Also the ... -
Phosphorus separation from metallurgical-grade silicon by magnesium alloying and acid leaching
(Peer reviewed; Journal article, 2020)n this paper, the separation of phosphorus from metallurgical-grade silicon was investigated based on an Mgalloying and HCl leaching approach. Experimental results show that P concentration was reduced from initial15.1pp ... -
Photocorrosion of metals - A study on the corrosion process and the interaction between oxide-covered metals and light
(Doctoral theses at NTNU;2021:228, Doctoral thesis, 2021)This work investigates how light may affect corrosion of metals. The purpose of this thesis is to answer the question: How does light influence the corrosion process? And more specifically, how corrosion of important ... -
Photocorrosion of n- and p-Type Semiconducting Oxide-Covered Metals: Case Studies of Anodized Titanium and Copper
(Peer reviewed; Journal article, 2022)Illumination affects corrosion of oxide-covered metals via photoinitiated dissolution processes. Herein, anodized titanium with n-type semiconducting anatase TiO2 and anodized copper with p-type semiconducting cuprite Cu2O ... -
Photoelectrochemical Characterization of Dye-sensitized Solar Cells
(Master thesis, 2018)Dye-sensitized solar cells, DSSCs, are thin film solar cells based on a photoelectrochemical system where a photo-sensitized anode and an electrolyte forms a semiconductor. Upon exposure of sunlight, the surface of the ... -
Photoelectrochemical Hydrogen Production
(Master thesis, 2012)The possibilities for using CaNb2O6 as a photocatalyst in direct water splitting have been evaluated by investigating the electronic structure of the material. In addition the oxide was doped with nitrogen in order to ... -
Physical and Mechanical Properties of Graphene Nanoplatelets Reinforced Al6061-T6 Composites processed by Spark Plasma Sintering
(Peer reviewed; Journal article, 2020)Aluminium matrix composites with high specific strength are attracting attention for use in automobile and aerospace applications. Graphene nanoplatelets (GNPs) were added in 0.1, 0.5, and 1 weight fractions to an Al6061 ... -
Physual Designing - A Supportive Framework for Dispersed Engineering Design
(Dr. ingeniøravhandling, 0809-103X; 2003:56, Doctoral thesis, 2003)Corporations involved in engineering design face multiple challenges; collaboration in complex, geographically dispersed value chains, increasing pressure to reduce lead times to improve their competitive positions, and ... -
Piezoelectric K0.5Na0.5NbO3 Ceramics Textured Using Needlelike K0.5Na0.5NbO3 Templates
(Journal article; Peer reviewed, 2014)Improved performance by texturing has become attractive in the field of lead-free ferroelectrics, but the effect depends heavily on the degree of texture, type of preferred orientation, and whether the material is a rotator ... -
Piezoelectricity and rotostriction through polar and non-polar coupled instabilities in bismuth-based piezoceramics
(Peer reviewed; Journal article, 2016)Coupling of order parameters provides a means to tune functionality in advanced materials including multiferroics, superconductors, and ionic conductors. We demonstrate that the response of a frustrated ferroelectric state ... -
Piezoresponse force microscopy and nanoferroic phenomena
(Journal article; Peer reviewed, 2019)Since its inception more than 25 years ago, Piezoresponse Force Microscopy (PFM) has become one of the mainstream techniques in the field of nanoferroic materials. This review describes the evolution of PFM from an imaging ... -
Pilot scale fabrication of lanthanum tungstate supports for H<inf>2</inf> separation membranes
(Peer reviewed; Journal article, 2022)This paper reports the fabrication of asymmetric tubular geometry lanthanum tungstate-based membranes for high temperature H2 separation applications. As starting materials, powders with the compositions La28-yW4+yO54+δ ...