Blar i Institutt for materialteknologi på tittel
Viser treff 1141-1160 av 2527
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In situ X-ray diffraction studies of the crystallization of K0. 5Na0. 5NbO3 powders and thin films from an aqueous synthesis route
(Peer reviewed; Journal article, 2021)Aqueous chemical solution deposition is a promising route for ferroelectric K0.5Na0.5NbO3 (KNN) thin films, requiring a stable precursor solution with complexed Nb5+. Here, we report on the local structure of Nb-complexes ... -
In Vitro Biocompatibility of Piezoelectric K<inf>0.5</inf>Na<inf>0.5</inf>NbO<inf>3</inf>Thin Films on Platinized Silicon Substrates
(Peer reviewed; Journal article, 2020)Lead-free piezoelectric ceramics like K0.5Na0.5NbO3 (KNN) represent an emerging class of biomaterials for medical technology, as they can be used as components in implantable microelectromechanical systems (MEMS) and ... -
In-plane Ferroelectricity in Barium Titanate Films
(Doctoral theses at NTNU;2020:201, Doctoral thesis, 2020)Ferroelectric materials are irreplaceable materials in electronics used everywhere in the modern society. The ferroelectric perovskites are the most widely used class of ferroelectric materials, and the use is dominated ... -
In-situ Compession Testing of Nanosized Pillars
(Master thesis, 2014)Applications of nanomechanical testing methods have become increasingly important in all fields of material research. There is a significant interest in obtaining information about material features at small scales, in ... -
In-situ determination of thickness and electrochemical properties of barrier oxide film on impure aluminium in aqueous solution
(Journal article; Peer reviewed, 2018)Lead is present as a trace element (ppm level) in nearly all commercial aluminium alloys. The objective of this work is to investigate the changes incurred by the presence of a small amount (20 ppm) of alloyed Pb and heat ... -
IN-SITU FRACTURE MECHANICAL TESTING OF MICROSIZED CANTILEVERS
(Master thesis, 2014)The arctic is an appealing new ventures area for the oil and gas industry. However the climate is extremely demanding, and more technically challenging than any other environment. With design temperatures down to -60°C the ... -
In-situ observations of dislocation recovery and low angle boundary formation in deformed aluminium
(Journal article; Peer reviewed, 2019)An experimental study of the recovery of dislocations and low angle boundary formation in aluminium is presented. By combining in-situ annealing with orientation mapping in the transmission electron microscope, maps of ... -
In-situ structural investigations of ferroelasticity in soft and hard rhombohedral and tetragonal PZT
(Journal article; Peer reviewed, 2015-10-28)Despite the technological importance of hard and soft PZT, Pb(Zr,Ti)O3, ceramics, the mechanisms of ferroelectric hardening and softening remain widely discussed in the literature. The hardening and softening phenomena ... -
In-situ studies of multicrystalline silicon nucleation and growth on alpha- and beta-Si3N4 coated substrates
(Journal article; Peer reviewed, 2018)The growth of silicon on various nitride coated quartz substrates were studied using in-situ observation of the solidification process. Three different coating types were used: One consisting entirely of α-Si3N4 particles, ... -
In-Situ Tensile Testing Combined with EBSD Analysis of Ti-6Al-4V Samples from Components Fabricated by Additive Layer Manufacture
(Master thesis, 2012)ALM-based production of Titanium components shows great promise in supplying cost-effective products within industries such as energy, chemical processing and aerospace. In common for all is high quality demands. This ... -
In-situ X-radiographic study of nucleation and growth behaviour of primary silicon particles during solidification of a hypereutectic Al-Si alloy
(Peer reviewed; Journal article, 2020)Real-time observation of structure evolution in a hypereutectic Al-Si(-Cu) alloy under near-isothermal melt solidification condition was conducted by using in-situ micro-focus X-radiography. The nucleation, growth rate and ... -
In-situ X-ray microtomography of interface between additively manufactured aluminium bronze and H13 tool steel
(Peer reviewed; Journal article, 2022)Directed energy deposition (DED) is an additive manufacturing process category where material is melted as it is deposited, often powder melted with a focused laser. In this work aluminium bronze was deposited onto H13 ... -
In-vitro Study of the Material Properties of PUR Subcutaneous Venous Access Ports Exposed to Chemotherapy Drugs and Whole Blood
(Master thesis, 2015)Central Venous Catheters (CVCs) are used to provide safe administration of chemotherapeutic drugs during cancer treatment. This study focused on how the treatment influences the material properties of one type of CVC, the ... -
Inclusion Optimized Silicon for the Production of Silicones
(Master thesis, 2015)One of the challenges with silicones production is the accumulation of impurities from metallurgical grade silicon (MG-Si) in the reactor. Size, shape and density of the intermetallics affect the accumulation, and their ... -
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 ... -
Industrialising of the Hybrid Metal Extrusion & Bonding(HYB) Method – from Prototype towards Commercial Process
(Doktoravhandlinger ved NTNU, 1503-8181; 2013:339, Doctoral thesis, 2013) -
Infiltration of W-Cu composites - developing a high-density material suitable for dampening systems
(Master thesis, 2020)Formålet med denne masteroppgaven er å diskutere om det infiltrerte W-Cu produktet er en levedyktig erstatning for en dempermassekomponent for bruk i dempesystemer. De mekaniske egenskapene ble testet ved bruk av strekkprøving ... -
Influence of Annealing of Al-5Ti-1B Master Alloy on Hot Tearing of Cast Al-7Si-3Cu Alloy
(Journal article; Peer reviewed, 2017)Hot tearing is a common and severe defect encountered in aluminium alloys castings. It is affected by alloy composition as well as processing conditions and variables. In Al–7Si-3Cu presence of copper increases mechanical ... -
Influence of Artificial Porosity on Piezoelectric Behavior of (K,Na)NbO3 (KNN) Bulk Ceramics
(Master thesis, 2016)The influence of artificial porosity on the piezoelectric behaviour of KNN was studied for possible biomedical applications. A "piezoelectric effect" observed in bone is expected to trigger bone growth and healing. Therefore, ... -
Influence of Atmosphere and Temperature on Polycyclic Aromatic Hydrocarbon Emissions from Green Anode Paste Baking
(Peer reviewed; Journal article, 2023)Coal tar pitch, a well-known source of polycyclic aromatic hydrocarbons (PAHs), is used as a binder of petroleum coke in prebaked anodes used for electrolysis of aluminum. Anodes are baked up to 1100 °C over a 20-day period, ...