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Dissertations / Theses on the topic 'Mechanical ball milling'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Rail, Alexandre. "Model-based control of metal powder ball milling." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102157.

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At Domfer Metal Powders, the ball milling operation is critical since it determines many characteristics of the final product, such as density, green strength, compressibility and dimensional change. Highly variable input material properties and operational procedures accompanied by poor product feedback frequency generate large variations in powder properties. The goal of the research is to develop a model-based control system for the ball milling process of metal powder. The following research objectives are aimed at reducing process variations while maximizing throughput: include ball mill

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2

Aysin, Basak. "Photocatalytic Properties Of Silver Loaded Titanium Dioxide Powders Produced By Mechanical Ball Milling." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614199/index.pdf.

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Silver (Ag) was loaded to three different kinds (P-25, NT-22, and TiO(OH)2) of titanium dioxide (TiO2) powders through adding three different quantities (4.6, 9.2, and 13.8 ml) of silver nitrate (AgNO3) solution by mechanical ball milling process. X-Ray diffraction analysis suggested that Ag was loaded on the TiO2 powders in the form of silver oxide (AgO). SEM, particle size, and BET surface area analyses revealed that TiO2 particles agglomerated after ball milling, resulting in the decrease of specific surface area of the TiO2 powders. Powders P-25, NT-22, and TiO(OH)2 degraded 94 %, 46 %, an

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3

Buchheim, Cláudia Sofia de Andrade Redondo Murilhas. "Mechanical behaviour of AISiC nano composites produced by Ball Milling and Spark Plasma Sintering." Doctoral thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/11645.

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Doutoramento em Engenharia Mecânica<br>Neste trabalho foram produzidos nanocompósitos de AlSiC misturando alumínio puro com nano partículas de SiC com diâmetro de 45 – 55 nm, usando, de forma sequencial, a técnica da metalurgia do pó e a compactação por “ Spark Plasma Sintering”. O compósito obtido apresentava grãos com 100 nm de diâmetro, encontrandose as partículas de SiC localizadas, principalmente, nas fronteiras de grão. O nanocompósito sob a forma de provetes cilíndricos foi submetido a testes de compressão uniaxial e a testes de nanoindentação para analisar a influência das n

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4

Khovaylo, V., A. Usenko, M. Gorshenkov, and S. Kaloshkin. "Optimization of Ball-Milling Process for Preparation of Si-Ge Nanostructured Thermoelectric Materials." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35302.

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Here we report on technical details of preparation of Si-Ge-based nanostructured thermoelectic materials by a mechnical alloying method. It has been shown that for a milling speed of 350 rpm a single Si-Ge phase is formed after milling time less than 6 h. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35302

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5

Lohse, Benjamin H. "The controlled ball milling of titanium and carbon to form TiC /." Access electronically, 2005. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20060221.110552/index.html.

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6

Phasha, Maje Jacob. "Fundamental study of immiscible Ti-Mg system : ball milling experiments and ab initio modelling." Thesis, University of Limpopo, Turfloop Campus, 2013. http://hdl.handle.net/10386/1395.

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Thesis (Ph. D. (Physics)) -- University of Limpopo, 2013.<br>A combination of ball milling experiments and ab initio calculations in this study successfully yielded results that shed light into understanding the fundamental basis for immiscibility and the concept of mechanical alloying in Ti-Mg system. In addition, the conditions for achieving extended solid solubility in elements that usually do not dissolve in each other under thermodynamic equilibrium conditions have been predicted using ultrasoft (US) and norm-conserving (NC) pseudopotentials. Hydostatic pressures required to stabilize ord

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7

Barahona, Javier. "Simulation and Optimization of Mechanical Alloying Using the Event-Driven Method." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20458.

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Mechanical Alloying is a manufacturing process that produces alloys by cold welding of powders. Usually, a vial containing both the powder and steel balls is agitated. Due to impact between the balls and balls and the vial, the powder is mechanically deformed, crushed, and mixed at nano-scales. In this thesis, a numerical model is developed to simulate the dynamics of the vial and the grinding balls of the SPEX 8000 ball milling device, a standardized equipment in both industrial and academic investigations of ball milling. The numerical model is based on the Event Driven Method, typically use

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8

Tole, Ilda. "Mechanical activation of clay : a novel route to sustainable cementitious binders." Licentiate thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76362.

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EU Sustainable Development Strategy planned to achieve improvement of life-quality by promoting sustainable production and consumption of raw materials. On November 2018, EU Commission presented a long-term strategy, aiming among others a climate-neutral economy by 2050. Cement production is contributing to 6-10% of the anthropogenic CO2 emissions. Thus, several strategies for total or partial replacement of Portland cement in concrete production have been developed. The use of supplementary cementitious materials (SCM) and alkali-activated materials (AAM) is considered the most efficient coun

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9

Falcão, Railson Bolsoni. "Obtenção do TiFe por moagem com alta energia." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-25082011-151614/.

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Neste trabalho, investigou-se a elaboração mecânica do composto intermetálico TiFe por moagem de bolas com alta energia. Uma forte aderência do material moído, particularmente nas paredes do recipiente de moagem, foi o principal problema verificado com tempos de moagem superiores a 1 hora (moinho agitador). Tentativas para resolver este problema foram realizadas inicialmente com o emprego de agentes controladores de processo (ACPs), como etanol, ácido esteárico, polietileno de baixa densidade, benzeno e ciclohexano, em diferentes quantidades (1 a 20% em massa) e tempos (1 a 40 h), mantendo-se

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10

Quajai, Sirisart, and soj@kmitnb ac th. "Biopolymer Composite based on Natural and Derived Hemp Cellulose Fibres." RMIT University. Applied Sciences, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20061222.111612.

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The aim of this research was to study the effect of pre-treatment and modification processes on the properties of hemp cellulose fibre for biopolymer composites application. Hemp fibres have been modified by various extraction, swelling, chemical and enzymatic treatments. The morphology and mechanical properties of the modified fibres have been measured. Biopolymer composites have been prepared using the modified fibres and matrices of cellulose acetate butyrate and cellulose solutions derived from hemp. The first fibre treatment employed was acetone extraction and mercerization. A low press

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11

Mereib, Diaa. "Fabrication et caractérisation des matériaux composites lamellaires à matrice Ti et TA6V." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0025/document.

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Apprenant de la nature, les architectures spécifiques de certains organismes vivants sont devenues l'une des idées dominantes dans le développement de nouvelles générations de matériaux synthétiques. Dans cette optique, la structure lamellaire de la nacre peut servir de modèle pour la fabrication de nouveaux matériaux composites à matrices métalliques. Un nouveau procédé de métallurgie des poudres, appelée métallurgie des poudres « plaquettes » (FPM), a ainsi été développée pour fabriquer des matériaux composites à matrice métallique à structure lamellaire.L’objectif de ce travail de thèse est

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12

Castro, Mauricio de. "ESTUDO COMPARATIVO DA ATIVAÇÃO MECÂNICA POR MOINHOS DE ALTA ENERGIA E CARACTERIZAÇÃO DOS PRODUTOS OBTIDOS DURANTE REAÇÃO DE REDUÇÃO DO ÓXIDO DE CROMO POR ALUMÍNIO." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2015. http://tede2.uepg.br/jspui/handle/prefix/1470.

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Made available in DSpace on 2017-07-21T20:43:47Z (GMT). No. of bitstreams: 1 Mauricio Castro.pdf: 5841824 bytes, checksum: 35f8699394396800943abee89ca868ba (MD5) Previous issue date: 2015-01-30<br>Fundação Araucária de Apoio ao Desenvolvimento Científico e Tecnológico do Paraná<br>This study aims to compare the supply capacity of power each of the three main types of high-energy mills: The "SPEX", Planetary and "Attritor" mills. The system used was chromium oxide with metallic aluminum, both are powders. The reduction reaction of chromium oxide with aluminum in the milling does not occur ins

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13

Schmidt, Marek Wojciech, and Marek Schmidt@rl ac uk. "Phase formation and structural transformation of strontium ferrite SrFeOx." The Australian National University. Research School of Physical Sciences and Engineering, 2001. http://thesis.anu.edu.au./public/adt-ANU20020708.190055.

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Non-stoichiometric strontium iron oxide is described by an abbreviated formula SrFeOx (2.5 ≤ x ≤ 3.0) exhibits a variety of interesting physical and chemical properties over a broad range of temperatures and in different gaseous environments. The oxide contains a mixture of iron in the trivalent and the rare tetravalent state. The material at elevated temperature is a mixed oxygen conductor and it, or its derivatives,can have practical applications in oxygen conducting devices such as pressure driven oxygen generators, partial oxidation reactors in electrodes for solid oxide fuel cells (SOFC).

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14

Andersson, Henrik. "Yt- och strukturpåverkan vid finfräsning av härdat verktygsstål." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-51787.

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I detta examensarbete har undersökningar kring finfrästa ytor i härdat verktygsstål utförts i samarbete med verktygsstålsproducenten Uddeholms AB i Hagfors. Vid spånskärande bearbetning påverkas materialet ibland negativt. En försöksserie om totalt 90 finfrästa ytor i härdade varmarbetsstålen Uddeholm Orvar Supreme och Uddeholm Dievar har frästs, mätts och utvärderats för att ta reda på hur fräsprocessen inverkar på materialets egenskaper. Det visar sig att materialet påverkas olika mycket beroende på hur fräsningen utförs och med vilken typ av fräsverktyg som används. I detta arbete har endas

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15

Breidenich, Jennifer L. "Impact-initiated combustion of aluminum." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54403.

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This work focuses on understanding the impact-initiated combustion of aluminum powder compacts. Aluminum is typically one of the components of intermetallic-forming structural energetic materials (SEMs), which have the desirable combination of rapid release of thermal energy and high yield strength. Aluminum powders of various sizes and different levels of mechanical pre-activation are investigated to determine their reactivity under uniaxial stress rod-on-anvil impact conditions, using a 7.62 mm gas gun. The compacts reveal light emission due to combustion upon impact at velocities greate

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16

Barguet, Laurianne. "Contrôle acoustique et vibratoire de la mécano-synthèse des matériaux composites à matrice métallique nanostructurés." Thesis, Le Mans, 2015. http://www.theses.fr/2015LEMA1027/document.

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Lors de la synthèse des aciers ODS, la première étape consiste à réaliser un broyage actif, appelé mécano-synthèse, entre les matériaux de départ qui sont la poudre métallique et les renforts d’oxyde. Ce procédé peut se réaliser au moyen d’un broyeur à boulets, constitué d’une cuve cylindrique à l’intérieur de laquelle des billes en acier sont introduites. Le broyage résulte des combinaisons de chocs entre billes, poudre et paroi de la cuve, ce qui conduit à une évolution de la de la taille, de leur forme et de leur polydispersité. La première partie de cette thèse s’est attachée à élaborer un

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17

Kasonde, Maweja. "The mechanical alloying of sub-stoichiometric titanium carbonitride-tungsten-aluminium by high energy ball milling." Thesis, 2012. http://hdl.handle.net/10539/11177.

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The transformations occurring in the sub-stoichiometric Ti(C,N) – W - Al system processed by high energy ball mill were investigated. The milling parameters included the milling time and the temperature comprising milling at subzero temperature and above 25°C. Two sub-stoichiometric Ti(C,N) stocks were selected, the Ti(C0.5N0.05) containing more interstitial elements than the Ti(C0.5N0.5)0.6.The transformation stages and mechanisms of alloying are discussed with respect to the changes in crystal structures of the powder constituents. The milling atmosphere had an effect on the lattice st

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18

Chen, Guan-Ting, and 陳冠廷. "Effect of high energy ball milling and thermal hydrogen processing on mechanical properties of magnesium alloy." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/2zjf5c.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>106<br>AZ91 is the common magnesium alloy in industry. WZ73 become a new type of magnesium alloy material due to LPSO phase. As the demand for magnesium alloys grows year by year, the amount increase of magnesium alloys scrap will be expected. The scrap recovery problem can be solved if the scrap waste can be effectively utilized. In this study, swarf of AZ91 and WZ73 alloys were used to investigate the effects of processes, which were processed by thermal hydrogen processing, high energy ball milling, ball milling and thermal hydrogen combined processing, and the po

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19

Chow, P. S., G. Lau, W. K. Ng, and Venu R. Vangala. "Stability of Pharmaceutical Cocrystal During Milling: A Case Study of 1:1 Caffeine-Glutaric Acid." 2017. http://hdl.handle.net/10454/12360.

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yes<br>Despite the rising interest in pharmaceutical cocrystals in the past decade, there is a lack of research in the solid processing of cocrystals downstream to crystallization. Mechanical stress induced by unit operations such as milling could affect the integrity of the material. The purpose of this study is to investigate the effect of milling on pharmaceutical cocrystal and compare the performance of ball mill and jet mill, using caffeine-glutaric acid (1:1) cocrystal as the model compound. Our results show that ball milling induced polymorphic transformation from the stable Form II

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20

Parviz, Roozbeh. "Nanostructured Light Metal Hydrides Based on Li, Al, Na, B and N for Solid State Hydrogen Storage." Thesis, 2013. http://hdl.handle.net/10012/7667.

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The present work reports a study of the effects of the compositions, and various catalytic additives and nanostructuring by high-energy ball milling, on the hydrogen storage properties of LiBH4, NaBH4, LiNH2 and LiAlH4 complex hydrides and their composites. The composites of (NaBH4+2Mg(OH)2) and (LiBH4+2Mg(OH)2) without and with nanometric nickel (n-Ni) added as a potential catalyst were synthesized by ball milling. The effect of the addition of 5 wt.% nanometric Ni on the dehydrogenation behavior of both the NaBH4-and LiBH4-based composites is rather negligible. In the (LiNH2+nMgH2) system,

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21

Singh, Kaushal Kishore, and Sudipto Bhattacharjee. "Study on the effect of high energy ball milling (a nano material process) on the microstructure and mechanical properties of a (Al-Si-Fe-Cu) alloy." Thesis, 2007. http://ethesis.nitrkl.ac.in/4216/1/Study_on_the_effect_of_high_energy_ball.pdf.

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Mechanical alloying is a solid-state powder processing technique involving repeated welding, fracturing, and rewelding of powder particles in a high-energy ball mill. Mechanical Alloying has now been shown to be capable of synthesizing a variety of equilibrium and non-equilibrium alloy phases starting from blended elemental or prealloyed powders.Materials have been found to attain unusual properties in their nano level sizes which are not found in their conventional form.Al-Si alloys containing other transition metals are used in the as cast condition for automotive and aerospace for the engin

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22

Lusambo, Martin. "An integrated model of milling and flotation for the optimal recovery of sulphide ores at the Kansanshi mine." Diss., 2019. http://hdl.handle.net/10500/26692.

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Kansanshi mine sulphide ore circuit did not achieve target flotation recovery in 2016, hence it was deemed necessary to carry out a research aimed at optimizing this circuit. The objective of the research was to optimise the Kansanshi milling and flotation circuit processing a copper sulphide ore. In line with this, samples were obtained around the circuit and processed in the laboratory for moisture content, slurry concentration, particle size distribution, and flotation response. This information was then used to build a computer-based model of the Kansanshi milling and flotation circ

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23

Azevedo, Cristiano da Cruz. "A moagem e a produção de derivados de grafite a partir de elétrodos, para aplicações em engenharia mecânica." Master's thesis, 2016. http://hdl.handle.net/10316/36997.

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O presente estudo tem como base o conceito de economia circular. O principal objetivo é o desenvolvimento de técnicas de exfoliação para transformação de elétrodos de grafite em derivados de grafite ou grafeno, que sejam possíveis de ser industrializados. Foram estudados vários processos exfoliativos, com principal atenção na exfoliação com recurso a moinho de bolas. Neste foram testadas várias hipóteses de modo a obter um resultado o mais próximo possível do grafeno. Os materiais foram caracterizados através de diferentes técnicas. As mais relevantes são a espetroscopia de Raman e micr

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24

Shahid, Hafiz Rub Nawaz. "Strengthening of Al-based composites by microstructural modifications." Doctoral thesis, 2018. https://tud.qucosa.de/id/qucosa%3A32753.

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Die Verstärkung von Aluminium-Matrix-Verbundwerkstoffen kann durch die Integration von Hartphasenpartikeln in die Matrix erreicht werden. Die Festigkeitssteigerung der Komposite ist abhängig davon, wie die Verstärkungsphase die einwirkenden Kräfte aufnehmen kann und zudem von den Auswirkungen der Verstärkungsphase auf das Werkstoffgefüge. Die Verfestigung wird zurückgeführt auf Versetzungsmultiplikation, Matrixpartitionierung und Orowan-Verstärkungseffekte. Die Festigkeit steigt durch Erhöhung des Volumenanteils der Verstärkungsphase sowie durch die Reduktion der Größe der Verstärkungsphase. D

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25

Schmidt, Marek Wojciech. "Phase formation and structural transformation of strontium ferrite SrFeOx." Phd thesis, 2001. http://hdl.handle.net/1885/48187.

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Non-stoichiometric strontium iron oxide is described by an abbreviated formula SrFeOx (2.5 ≤ x ≤ 3.0) exhibits a variety of interesting physical and chemical properties over a broad range of temperatures and in different gaseous environments. The oxide contains a mixture of iron in the trivalent and the rare tetravalent state. The material at elevated temperature is a mixed oxygen conductor and it, or its derivatives,can have practical applications in oxygen conducting devices such as pressure driven oxygen generators, partial oxidation reactors in electrodes for solid oxide fuel cells (SOFC).

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