Searched for: subject:"alumina"
(1 - 20 of 29)

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van Gog, H. (author)
Aluminum hydrate dehydration interfaces were studied using a van der Waals density functional. The interface configurations investigated here as a first exploration of possible interface geometries, were all found to have a reasonable probability of occurring. From gibbsite/boehmite and boehmite/γ-Al<sub>2</sub>O<sub>3</sub> interface...
journal article 2021
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Chauhan, Devi Singh (author)
Aim of the blast furnace ironmaking process is the extraction of iron from iron ore, and prepare the raw iron (hot metal) for steel making. The iron oxides (ore) are charged into the furnace in the form of sinters and pellets containing the iron ore. Iron ore interacts with reducing gases and coke to form molten iron which in combination with...
master thesis 2020
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Guatame-Garcia, L.A. (author), Buxton, M.W.N. (author)
In response to the growing demand for sustainable products and services, the kaolin calcination industry is developing practices that optimise the use of resources. The main challenges include more efficient use of raw materials and a reduction in the energy consumed by the calcination furnace. An opportunity to achieve this lies in the...
journal article 2020
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ten Bruggencate, Thijs (author)
For this Master thesis the possibility was explored to use a monolayer of graphene as conductive layer, instead of sputtered titanium nitride (TiN), on 25 nm thick aluminium oxide and magnesium oxide membranes. These membranes will be used in a new and faster variant of a vacuum electron multiplier (e.g. the Photo Multiplier Tube (PMT)). These...
master thesis 2019
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Azof, Fabian Imanasa (author), Yang, Y. (author), Panias, Dimitrios (author), Kolbeinsen, Leiv (author), Safarian, Jafar (author)
The leaching characteristics and mechanism of synthetic CaO-Al <sub>2</sub> O <sub>3</sub> slags in alkaline solution at atmospheric pressure have been studied. The purpose of the study is to have a better understanding of the leaching part of the Pedersen process, as an alternative to the Bayer process for alumina production. The...
journal article 2019
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Zhang, Di (author), La Zara, D. (author), Quayle, Michael J. (author), Petersson, Gunilla (author), van Ommen, J.R. (author), Folestad, Staffan (author)
The morphology, size, and surface properties of pharmaceutical particles form an essential role in the therapeutic performance of active pharmaceutical ingredients (APIs) and excipients as constituents in various drug delivery systems and clinical applications. Recent advances in methods for surface modification, however, rely heavily on...
journal article 2019
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Suresh, Sunil (author)
Having an absorber layer thickness below 1 micrometre for a regular copper indium gallium di-selenide (CIGS) solar cell reduces the pathways for electron collection which lead to reduced recombination in the bulk absorber layer. Additionally, it reduces material costs and production time. Yet, having such a thin absorber reduces the cell...
master thesis 2018
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Boatemaa, L. (author)
Alumina (Al2O3) is an attractive ceramic for engineering applications operating at elevated or high temperatures because of its good thermal and chemical resistance. It also maintains high strength and hardness at high temperatures. These desirable properties are due to the strong covalent and ionic bonds existing between its atoms.<br/>However,...
doctoral thesis 2018
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Goossen, Levar (author)
<br/>Nanocatalysis has received considerable attention in the scientific community due to their superior reactivity compared to their macro-sized counterparts. MEMS nanoreactors allow scientists to view these reactions in-situ. This opens up doors to finally understanding the underlying mechanisms of the nanocatalyst's effectiveness, which may...
master thesis 2018
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Guatame-Garcia, L.A. (author), Buxton, M.W.N. (author), Deon, F. (author), Lievens, Caroline (author), Hecker, Chris (author)
In the production of calcined kaolin, the on-line monitoring of the calcination reaction is becoming more relevant for the generation of optimal products. In this context, this study aimed to assess the suitability of using infrared (IR) spectroscopy as a potential technique for the on-line characterization of the<br/>calcination of kaolin. The...
journal article 2018
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Kwakernaak, C. (author), Sloof, W.G. (author)
A fast and generic scheme is proposed to calculate the work of adhesion between two different materials or the cohesive energy between two crystal planes in a material. These calculations make use of the regular solution theory. This theory is extended to describe chemical interactions between atoms at either side of an interface. The so...
journal article 2018
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Boatemaa, L. (author), van der Zwaag, S. (author), Sloof, W.G. (author)
This work explores the possibility of using embedded micron-sized Ti particles to heal surface cracks in alumina and to unravel the evolution of the crack filling process in case of pure solid-state oxidation reactions. The oxidation kinetics of the Ti particles is studied and the results are applied in a simple model for crack-gap filling....
journal article 2018
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Boatemaa, Linda (author), Bosch, Myrthe (author), Farle, Ann Sophie (author), Bei, G. (author), van der Zwaag, S. (author), Sloof, W.G. (author)
In this work, the oxidation-induced crack healing of Al<sub>2</sub>O<sub>3</sub> containing 20 vol.% of Ti<sub>2</sub>AlC MAX phase inclusions as healing particles was studied. The oxidation kinetics of the Ti<sub>2</sub>AlC particles having an average diameter of about 10 μm was studied via thermogravimetry and/or differential thermal...
journal article 2018
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Carabat, A.L. (author), Meijerink, M.J. (author), Brouwer, J.C. (author), Kelder, E.M. (author), van Ommen, J.R. (author), van der Zwaag, S. (author), Sloof, W.G. (author)
A successful sol-gel process to encapsulate molybdenum di-silicide MoSi<sub>2</sub> particles with a closed and thermally stable Al<sub>2</sub>O<sub>3</sub> layer using aluminium tri-sec-butoxide as a precursor is presented. The processing conditions such as precursor selection and temperature were optimized through analysing the interaction...
journal article 2018
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Valdesueiro, David (author), Hettinga, Hans (author), Drijfhout, Jan Pieter (author), Lips, Priscilla (author), Meesters, G.M.H. (author), Kreutzer, M.T. (author), van Ommen, J.R. (author)
In this work, we report a method to change the surface finish of a standard polyester-based powder coating paint, from gloss to matt, by depositing ultrathin films of Al<sub>2</sub>O<sub>3</sub> on the powder coating particles. The coating experiments were performed in a fluidized bed reactor at 1 bar and 27 °C, using a gas-phase coating...
journal article 2017
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Fan, B. (author)
In this project we introduce the sintering process, which involves two basic phenomena, pore shrinkage and grain growth, occurring simultaneously. The objective of this project is to quantitatively describe the sintering process incorporating the kinetics of pore shrinkage and grain growth. First we build a model for pore shrinkage separately....
master thesis 2013
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Carabat, A.L. (author), Van der Zwaag, S. (author), Sloof, W.G. (author)
Easy crack propagation in oxide ceramic coatings limits their application in high temperature environment (e.g. such as engines and gas turbine components) [1]. In order to overcome this problem, incorporation of sacrificial particles into an oxide ceramic coating may be a viable option. Particles of silicon compounds, such as: Si3N4, SiC, MoSi2...
conference paper 2013
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Nanko, M. (author), Maruoka, D. (author)
Abstract only.
conference paper 2013
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Carabat, A.L. (author), Van der Zwaag, S. (author), Sloof, W.G. (author)
Easy crack propagation in oxide ceramic coatings limits their application in high temperature environment (e.g. such as engines and gas turbine components) [1]. In order to overcome this problem, incorporation of sacrificial particles into an oxide ceramic coating may be a viable option. Particles of silicon compounds, such as: Si3N4, SiC, MoSi2...
conference paper 2013
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Nijdam, T.J. (author), Sloof, W.G. (author)
The relation between the Y distribution in the alloy and the growth kinetics of the developing oxide scale was studied for the thermal oxidation of two Ni–20Co–19Cr–24Al–0.2Y (at.%) alloys at 1,373 K: (i) a coarse-grain cast alloy with large Ni5Y intermetallic precipitates, and (ii) a fine-grain freestanding coating with small Ni5Y precipitates....
journal article 2007
Searched for: subject:"alumina"
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