Bibliografie tematiche / Aluminium melting

Letteratura scientifica selezionata sul tema "Aluminium melting"

Autore: Grafiati

Pubblicato: 7 luglio 2024

Ultima modifica: 7 luglio 2024

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Articoli di riviste sul tema "Aluminium melting":

Mohammadifard, S., J. Langner, M. Stonis, S. Sauke, H. Larki Harchegani e B. Behrens. "Optische Schmelzbadüberwachung*/Optical monitoring of the melting bath in an Al-melting furnace". wt Werkstattstechnik online 108, n. 11-12 (2018): 760–66. http://dx.doi.org/10.37544/1436-4980-2018-11-12-20.

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In einem Aluminium (Al)-Schmelzofen sind der Füllstand des Schmelzbades und die Oxidschichtmenge mit Kontaktsensoren nicht überwachbar, da das Schmelzbad aufgrund der hohen Haltebereich-Temperaturen von über 600 °C nicht zugänglich ist. Deshalb wird ein Online-Überwachungssystem des Aluminium-Schmelzbades mithilfe optischer Sensoren erforscht. Dafür wird das Schmelzbad mit geeigneten optischen Messsystemen identifiziert. Schließlich werden durch Bildanalyse-Algorithmen die Höhenänderung der Schmelze herausgearbeitet. Zudem werden Oxidschichten im Ofen auf der Badoberfläche mithilfe der Algorithmen detektiert.   The melt level and oxide layer quantity in an aluminum melting furnace cannot be monitored by contact sensors, since the melting bath is not accessible due to the high holding temperature (above 600 °C). Therefore, the method of monitoring the melting bath by means of optical sensors is investigated for the first time. For this purpose, suitable optical measuring systems can be applied which will be able to record the melting bath. The height change of the melt is to be elaborated by means of image analysis and any oxide layer on the bath surface is to be detected.

Maulana, Ilham Taufik. "Perancangan Alat Bantu Pemanfaatan Gas Buang dari Proses Melting Recycle untuk Memanaskan Chips sebelum Masuk Melting Furnace". Jurnal Teknik Mesin ITI 4, n. 2 (15 giugno 2020): 63. http://dx.doi.org/10.31543/jtm.v4i2.416.

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Melting recycle merupakan proses pemisahan logam pengotor yang bersifat feromagnetik, dan proses peleburan aluminium chips menjadi logam aluminium cair. Aluminium Chips adalah aluminium padat berbentuk serpihan hasil proses permesinan CNC. Akan tetapi dalam proses pengeringan ini masih memiliki suatu kendala, yaitu temperatur aluminium chips yang masuk ke proses peleburan di melting furnace terlalu rendah, sehingga beberapa chips tidak bisa melt dan terbakar menjadi abu ketika chips dilebur di melting furnace. Hal tersebut disebabkan oleh performa burner yang tidak maksimal. Dirancanglah alat yang mampu meningkatkan temperatur aluminium chips sebelum masuk kedalam burner dengan memanfaatkan gas buang hasil dari proses melting recycle. Adapun perancangan ini dilakukan menggunakan perangkat lunak SolidWork 2014. Perancangan dengan menghitung konversi energi untuk meningkatkan efisiensi. Dari hasil perancangan maka didapatkan temperatur output pada pipa adalah = 333,43 ℃.

VEIT, S., D. ALBERT e R. MERGEN. "SURFACE MELTING OF ALUMINIUM ALLOYS". Le Journal de Physique Colloques 48, n. C7 (dicembre 1987): C7–127—C7–130. http://dx.doi.org/10.1051/jphyscol:1987722.

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Newman, Peter. "Dry Hearth Melting Furnaces". Materials Science Forum 630 (ottobre 2009): 103–10. http://dx.doi.org/10.4028/www.scientific.net/msf.630.103.

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This paper outlines various aluminium melting furnaces arrangement alternatives and their related benefits as well as the physical and practical challenges of the aluminium melting process using fuel fired reverberatory furnaces. Performance comparisons are made between dry hearth and wet hearth furnaces to highlight the benefits of dry hearth melting as well as the impact of melting practice on ultimate equipment performance. Both single chamber and twin chamber dry hearth furnaces are described in various configurations including the unique benefits of each design.

Flores Saldívar, Alfredo Alan, Rodrigo Juárez Martínez, Alfredo Flores Valdés, Jesús Torres Torres, Rocío Maricela Ochoa Palacios e Yun Li. "Mathematical Modelling for Furnace Design Refining Molten Aluminum". Metals 11, n. 11 (9 novembre 2021): 1798. http://dx.doi.org/10.3390/met11111798.

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The design of an aluminium melting furnace has faced two challenges: mathematical modelling and simulative optimization. This paper first uses fluid dynamics to model the aluminium process mathematically. Then, the model is utilized to simulate a round shaped reverberatory furnace for melting aluminium alloys. In order to achieve the highest thermal efficiency of the furnace, modelling and simulation are performed to predict complex flow patterns, geometries, temperature profiles of the mixture-gas air through the main chamber, as well as the melting tower attached to the furnace. The results led to the establishment of optimal position and angle of the burner, which are validated through physical experiments, ensuring recirculation of the combustion gases through the melting chamber and the melting tower. Furthermore, a proper arrangement of refractory materials is derived to avoid heat losses through the outer surface of the furnace. Temperature profiles are also determined for the optimization to arrive at the final design of the furnace. Compared with manual designs previously practiced, the simulation-based optimal design of furnaces offers excellent guidance, an increase in the aluminium processing and magnesium removal for more refined alloys, and an increased processing rate of aluminium chip accession.

Huynh, Khanh Cong, e Luc Hoai Vo. "Modification of aluminium and aluminium alloys by AL-B master alloy". Science and Technology Development Journal 17, n. 2 (30 giugno 2014): 56–66. http://dx.doi.org/10.32508/stdj.v17i2.1315.

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Chemical compositions and microstructures affect on mechanical – physical and working properties of aluminium and aluminum alloys. Transition elements, such as Ti, V, Cr, Zr in solid solution greatly reduce the electrical conductivity of aluminium and its alloys. For reduction of detrimental effects of transition elements, Al-B master alloys are added into molten aluminium to occur reactions of boron and transition elements to form diborides of titanium, vanadium, chromium and zirconium, which are markedly insoluble in molten aluminium, then these transition elements have an insignificant effects on conductivity. In addition, Al-B master alloys is also used as a grain refiner of aluminium and aluminium alloys. Aluminium borides particles in Al-B master alloys act as substrates for heterogeneous nucleation of aluminium and its alloys. Al-B master alloys are prepared from low cost materials, such as boric acid H3BO3 and cryolite Na3AlF6, by simple melting method, easily realize in electrical wire and cable factories.

Novak, Jakob. "Molecular dynamics simulation of aluminium melting". Materials and Geoenvironment 63, n. 1 (1 giugno 2016): 9–18. http://dx.doi.org/10.1515/rmzmag-2016-0002.

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AbstractSolid–liquid phase transition has been simulated by the molecular dynamics method, using isobaric–isoenthalpic ensemble. For interatomic potential, glue potential has been selected. The original algorithm for bookkeeping of the information on neighbouring relationships of the atoms has been developed and used in this research. Time consumption for calculation of interatomic forces has been reduced from o(N2) to o(N) by the use of this algorithm.Calculations show that phase transition from solid to liquid occurs between 1,000 K and 1,300 K. The simulated temperature of phase transition is higher than the experimental value due to the absence of crystal defects. If constant heat flux is supplied, temperature decreases during melting because the superheated state becomes unstable. During the cooling process, no significant changes of the observed variables were detected due to the high cooling rate, which prevents crystallisation.

Louvis, Eleftherios, Peter Fox e Christopher J. Sutcliffe. "Selective laser melting of aluminium components". Journal of Materials Processing Technology 211, n. 2 (febbraio 2011): 275–84. http://dx.doi.org/10.1016/j.jmatprotec.2010.09.019.

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Molenbroek, A. M., e J. W. M. Frenken. "Surface-melting induced faceting of aluminium". Surface Science 366, n. 3 (novembre 1996): 587–96. http://dx.doi.org/10.1016/0039-6028(96)00827-8.

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Butnariu, Ilie, D. Butnariu e I. Butnariu. "Studies and Researches Concerning the Presence of Iron in Secondary Aluminium Meltings and Valorification of Some Aluminium Waste". Materials Science Forum 690 (giugno 2011): 250–53. http://dx.doi.org/10.4028/www.scientific.net/msf.690.250.

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Present in the metallurgical industry one of the most frequently problem is the presence of Fe and his compound in secondary aluminum melting. This problem appears when using chip inadequate technologies. This work makes a survey on the problems which can appear because of the presence of Fe and his compound in aluminum. Two systems, Al-Si and Al-Si-Li, are analyzed, by taking into consideration metallographies, as well as the systems mechanical properties. The end presents metallographic evidence of the problems which Fe and his compound can cause in secondary aluminum meltings.

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Tesi sul tema "Aluminium melting":

Cooper, Daniel. "Reuse of steel and aluminium without melting". Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/245141.

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Carbon dioxide emissions must be dramatically reduced to avoid the potentially dangerous effects of climate change. The steel and aluminium industries produce large amounts of carbon dioxide, accounting for 6% of anthropogenic emissions. Previous studies have shown that in these industries there is limited scope for further improvements in energy efficiency. Material efficiency strategies can, however, further reduce emissions. This thesis focuses on materially efficient reuse without melting. A scoping study of current reuse found three opportunities, an examination of which forms the basis of this thesis: reusing components at end of product life; extending the lifespan of products; and reusing manufacturing scrap. The opportunity to reuse components has received little attention to date and there is no clearly defined set of strategies or barriers to enable assessment of appropriate component reuse; neither is it possible to predict future levels of reuse. This thesis presents a global assessment of the potential for reusing steel and aluminium components. A combination of top-down and bottom-up analyses is used to allocate the final destinations of current global steel and aluminium production to final products. A substantial catalogue has been compiled for these products characterizing key features of steel and aluminium components including design specifications, requirements in use, and current reuse patterns. To estimate the fraction of end-of-life metal components that could be reused for each product, the catalogue formed the basis of a set of semi-structured interviews with industrial experts. The results suggest that approximately 30% of steel and aluminium used in current products could be reused. Barriers against reuse are examined, prompting recommendations for redesign that would facilitate future reuse. In order to understand how product lifespans can be extended it must first be understood why products are replaced. A simple framework with which to analyse failure is applied to the products that dominate steel use, finding that they are often replaced because a component/sub-assembly becomes degraded, inferior, unsuitable or worthless. In light of this, four products, which are representative of high steel content products in general, are analysed at the component level, determining profiles of cumulative steel mass over the lifespan of each product. The results show that the majority of the steel components are underexploited – still functioning when the product is discarded. In particular, the potential lifespan of the steel-rich structure is typically much greater than its actual lifespan. Evidence from twelve case studies, in which product or component life has been increased, is used to tailor life-extension strategies to each reason for product failure, providing practical guidelines for designers. There is currently no commercial method of reusing small manufacturing scrap; however, previous research has demonstrated that extruded profiles can be created from small clean aluminium scrap, the scrap fragments solid-state welding together when extruded. In order to evaluate potential applications for these profiles four case studies are conducted in collaboration with aluminium producers and product manufacturers. It was found that strong and formable profiles could be produced from scrap. However, contaminated scrap sources, unreliable bonding and poor surface quality limited their potential for commercial use. No model exists for solid-state weld strength that is applicable to scrap extrusion. This prevents optimisation of the existing extrusion process and the development of new, potentially better, processes. Subsequently, this thesis presents a new model of weld strength as a function of relevant deformation parameters. The model is evaluated using a new experiment in which the deformation conditions can be varied independently. The experiments establish the basic relationships between deformation parameters and weld strength. The model correctly predicts these trends with predicted weld strengths typically lying within the experimental error range. The technical assessment of reuse presented in this thesis demonstrates the scope of potential change. If implemented, the opportunities presented would greatly increase the reuse of steel and aluminium, reducing the emissions emitted from liquid metal production in conventional recycling.

Crane, Leonard W. "Melting and solidification of Zinc-Aluminium alloys". Thesis, Aston University, 1997. http://publications.aston.ac.uk/13278/.

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Following a scene-setting introduction are detailed reviews of the relevant scientific principles, thermal analysis as a research tool and the development of the zinc-aluminium family of alloys. A recently introduced simultaneous thermal analyser, the STA 1500, its use for differential thermal analysis (DTA) being central to the investigation, is described, together with the sources of support information, chemical analysis, scanning electron microscopy, ingot cooling curves and fluidity spiral castings. The compositions of alloys tested were from the binary zinc-aluminium system, the ternary zinc-aluminium-silicon system at 30%, 50% and 70% aluminium levels, binary and ternary alloys with additions of copper and magnesium to simulate commercial alloys and five widely used commercial alloys. Each alloy was shotted to provide the smaller, 100mg, representative sample required for DTA. The STA 1500 was characterised and calibrated with commercially pure zinc, and an experimental procedure established for the determination of DTA heating curves at 10°C per minute and cooling curves at 2°C per minute. Phase change temperatures were taken from DTA traces, most importantly, liquidus from a cooling curve and solidus from both heating and cooling curves. The accepted zinc-aluminium binary phase diagram was endorsed with the added detail that the eutectic is at 5.2% aluminium rather than 5.0%. The ternary eutectic trough was found to run through the points, 70% Al, 7.1% Si, 545°C; 50% Al, 3.9% Si, 520°C; 30% Al, 1.4% Si, 482°C. The dendrite arm spacing in samples after DTA increased with increasing aluminium content from 130m at 30% to 220m at 70%. The smallest dendrite arm spacing of 60m was in the 30% aluminium 2% silicon alloy. A 1kg ingot of the 10% aluminium binary alloy, insulated with Kaowool, solidified at the same 2°C per minute rate as the DTA samples. A similar sized sand casting was solidified at 3°C per minute and a chill casting at 27°C per minute. During metallographic examination the following features were observed: heavily cored phase which decomposed into ' and '' on cooling; needles of the intermetallic phase FeAl4; copper containing ternary eutectic and copper rich T phase.

Hoult, A. P. "An experimental analysis of solid state pulsed laser melting of aluminium". Thesis, University of Warwick, 1999. http://wrap.warwick.ac.uk/36431/.

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Novel aspects of solid state laser spot melting of aluminium using a pulsed solid state laser were investigated. After a thorough characterisation of the performance of the solid state laser, an initial series of ranging trials were performed to identify parameters which produced cosmetically satisfactory consistent melt spots on the surface of a commercially available aluminium alloy. These melt spots demonstrated a number of features of interest, including symmetrical concentric ring structures on the surface of the spots. A review of published literature on the use of laser beams as an intense radiation source for pulsed laser surface melting was carried out which confirmed that these phenomena have not been researched or reported in any depth. Experimental work identified the conditions under which they could be reliably reproduced, and these conditions are very close to laser parameters used commercially for pulsed laser welding. Further investigations to understand their origin involved using modified aluminium surfaces and temporally shaped laser pulses. Experimental details are included which will allow reliable reproduction of this effect in the future. Specific thresholds were identified for these phenomena and this has led to an improved understanding of solid state laser spot melting on aluminium. It appears that these rings are part of a continuum of irradiance which leads to melt expulsion due to reactive vapour pressure.

Louvis, Eleftherios. "Techniques for producing high relative density aluminium alloy components with selective laser melting". Thesis, University of Liverpool, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.632653.

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Previous work has shown that the processing of aluminium alloys by Selective Laser Melting (SLM) is challenging, with fully dense components only being produced at high laser powers (minimum 330 W). The high laser power requirement for these parts is a problem as it is higher than that available in many SLM machines. Attempts to produce dense components by combining lower power and slow laser scanning speeds create a large melt pool that is difficult to control, leading to balling of the melted material and possible damage to the powder distribution system. Even when processing is carried out successfully, the laser scan speed, which has to be slower than 150 mm/s, increases build time and hence manufacturing costs. This thesis considers the changes that can be made to the SLM process to reduce the laser power required and to increase the laser scanning rates, while still producing components with a relative density approaching 100%. It also considers why aluminium and its alloys are much more difficult to process than stainless steels and commercially pure titanium. One reason for the difficulties in SLM of aluminium was the flowability of aluminium, which led to the redesign of the powder deposition mechanism of the SLM machines that were used. The major challenge for processing aluminium and its alloys was found to be oxidation due to the presence of oxygen within the build chamber. This formed thin oxide films on both the solid and molten materials. Examination of manufactured parts showed that when processing at laser power of 100 W the oxide films were broken between successive build layers due to Marangoni forces stirring the melt pool, but that walls of oxide were present between tracks within the same layer. As these films occurred in pairs one from each track, pores were formed in between creating open porosity.

Yoberd, Belmond. "An energy expert advisor and decision support system for aluminium melting and casting". Thesis, Kingston University, 1994. http://eprints.kingston.ac.uk/20580/.

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The aim of this project was to develop and implement an expert advisor system to provide information for selecting and scheduling several items of small foundry plants using electric resistance bale-out furnaces, to optimise metal use and reduce energy costs. This involved study in formulating the procedures and developing a “foundry user friendly” expert system for giving advice to unskilled operatives in what was a complex multi- variable process. This system (FOES) included investigation and development of an advising system on the casting of a large numbers of different objects cast under different operating conditions and electricity tariffs. Knowledge elicitation techniques were developed and used during the complicated knowledge election process. Since this research programme intended to look at the complete process of melting, holding and pouring of the aluminium alloy, complex electricity tariffs were incorporated into the expert system in order to accurately calculate the energy cost of each process. A sub-section of the FOES system (DAD) could advise the unskilled foundry operative identify and eliminate the seven most common aluminium alloy casting defect by using a novel technique of incorporating actual defect photographs which were digitally scanned into the system.

Carroll, Lisa M. "Rapid steady state solidification of Al alloys". Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298796.

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Jerrard, Peter George Eveleigh. "Selective laser melting of advanced metal alloys for aerospace applications". Thesis, University of Exeter, 2011. http://hdl.handle.net/10036/3576.

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Research focused on the selective laser melting (SLM) of stainless steels and aluminium alloys. For steels, the possibility of creating a magnetically graded material was demonstrated as well as the ability to improve consolidation with austenitic and martensitic stainless steel powder mixtures. Stainless Steel/CoCr hybrid samples were also manufactured and tested to investigate the advantages of functionally graded materials (FGMs). Al alloy research began with examining the requirements for successful Al alloy consolidation in SLM and through experimentation it was found that Al alloys with good welding properties were the best choice: pure Al was found to be completely unsuitable. 6061 Al alloy was then used as a base material to manufacture Al-Cu alloy samples. Single layer SLM samples were produced first, which resulted in recognised Al-Cu microstructures forming. Multilayer Al alloy SLM research resulted in the discovery of the theorised ability to manufacture Al-Cu alloy parts with a nanocrystalline Al matrix with dispersed Al2Cu quasicrystals, resulting in a material comparable to a metal matrix composite that showed excellent corrosion resistance and compressive strength. Finally, a demonstration part was made to test the capability of the SLM process producing an aerospace type geometry using a customised Al alloy. Observations during manufacture and post process analysis showed that Al alloys were susceptible to changes in mechanical properties due to the geometry of the manufactured part.

ABREU, ALUISIO P. "Efeito de aditivos na resistência ao ataque em concreto refratário a base de sílica pela liga Al-5 (porcento)Mg". reponame:Repositório Institucional do IPEN, 2005. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11342.

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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

Qian, Daishu. "Microstructure and corrosion performance of excimer laser-melted AA2124-T4 aluminium alloy and SiCp/AA2124-T4 composite". Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/microstructure-and-corrosion-performance-of-excimer-lasermelted-aa2124t4-aluminium-alloy-and-sicpaa2124t4-composite(705f8af9-2a7c-4188-91e4-fcf33d8f76f0).html.

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The present work studies the microstructure and corrosion behaviour of 25 vol.% SiCp/AA2124-T4 metal matrix composites (MMCs) and AA2124-T4 aluminium alloy; and also the capability of excimer laser surface melting (LSM) to improve the corrosion resistance of the SiCp/AA2124 MMC and the monolithic alloy (MA). Microstructural characterization has shown significant influence of the presence and size of SiC particles on the fine Al2Cu precipitate and Mg segregation at SiC/Al interfacial regions. Such precipitates are revealed to be active sites for corrosion initiation in the MMCs, while the preferential sites for corrosion initiation in the MA are the coarse intermetallics. Corrosion evaluation performed in a 0.6 M NaCl solution suggests that the corrosion resistance of the MMC reinforced with micrometre-sized SiC particles is inferior to that of the MA and the MMC reinforced with submicrometre-sized SiC particles. The submicrometre-sized SiC particles have little adverse effect on the corrosion resistance of the MMC due to the reduced interfacial precipitates. Thin films of up to several micrometres have been achieved by excimer LSM on both the MMC and the MA. The surface roughness and the thickness of the melted layer increase with increasing laser fluence. High number of pulses (40 P) results in significant porosity in the MA and networks of cracking in the MMC. A homogeneous layer without chemical segregation except the Cu-rich segregation bands has been obtained on the MA; while complex microstructures are observed for the MMC, including the Cu-rich segregation bands, Al-Si eutectic structure and microsegregation-free structure laid in sequence from the bottom of the melted layer to the top surface. The modelling work suggest that the presence of SiC particles gives rise in high temperatures in the melt pool, which is useful to explain the materials responses upon laser irradiation, such as decomposition of SiC, evaporation of matrix alloy, and oxides formation. The fast cooling rate up to 1011 K/s is responsible for the formation of microsegregation-free structure. Corrosion evaluation has indicated improvement of corrosion resistance of the MMC and the MA after excimer LSM due to the reduction of the intermetallics. For the laser-melted MA, the corrosion behaviour is governed by the surface morphology and the porosity. The significant rippled structure obtained under high laser fluence could lead to crevice corrosion in the valley between the ripples whilst the pores could provide penetrating routes for the chloride solution to reach the Cu-rich segregation bands, leading to the delamination of the melted layer. For the laser-melted MMC, corrosion mainly initiated at the SiC remnants, which are rich in Si. The corrosion sites of the laser-melted MMC are in the form of small cracked blisters.

Furu, Jørgen. "An Experimental and Numerical Study of Heat Transfer in Aluminium Melting and Remelting Furnaces". Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-20249.

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This work has been a combined experimental and numerical modeling effort aimed to help in the understanding of heat transfer processes when melting aluminium. In addition a newly developed type of oxy-fuel burner was investigated. Objectives set for this project include improving energy efficiency in a typical industry furnace used today and looking at possible new technology to realize higher efficiencies than normally obtained. As a starting point a literature review was done to get an overview of furnaces and technology used in aluminium remelting and recycling. The most commonly used furnace today for aluminium melting and remelting is the reverberatory furnace which was the focus of this work as well. Understanding the interaction of parameters influencing heat transfer and quantifying how heat is transferred in the furnace are key elements to be able to optimize energy efficiency. Reverberatory furnaces are usually heated by gas burners, more specifically with cold air as oxidizer. Recent developments in burner technology using pure oxygen as oxidizer has showed some promising results and was investigated in experiments and numerical models. Melting experiments were carried out in a controlled environment in a 500 kg laboratory scale furnace as a basis for understanding the heat transfer mechanisms and quantifying radiation and convection contributions when melting aluminium. The experiments also served as a reference for a numerical 1-dimensional heat transfer model along with more advanced 3-dimensional computational fluid dynamics (CFD) models using a commercial software package. Phenomena as turbulent flow, combustion, convection, conduction and radiation were included in the models along with latent heat release when melting metal. The influence and impact of physical parameters on the heat transfer could be determined in the numerical models and provided a more detailed analysis of the processes in the furnace. A newly developed Low Temperature Oxy-fuel (LTOF) burner was investigated and compared to a conventional cold air-fuel burner in a pilot scale furnace. Measurements of flame and furnace temperatures, gas composition and heat fluxes were done for both burners at two different input levels. Heating experiments of aluminium samples were performed to look at the difference between the burners for aluminium heating and melting applications. 3-dimensional CFD models were developed to determine unknown quantities such as metal emissivity and quantification of radiation and convection heat transfer. The experiments also confirmed the validity of the numerical models. Finally a full scale reverberatory industry furnace was modeled using a 3-dimensional CFD model. The air-fuel burners currently installed in the furnace was replaced by LTOF burners in the numerical model. The performance was compared to a previously published numerical model of the same furnace using air-fuel burners for two different metal configurations in the furnace. The influence of parameters such as burner input, metal emissivity, furnace wall emissivity and a dross layer was studied. The key factor when making improvements in furnaces is understanding the fundamental heat transfer processes in existing technology. The experimental and numerical modeling work presented in this thesis has studied these phenomena and created a basis from which further investigations into furnace efficiency in aluminium remelting and recycling can be done. The performance of a new type of burner was also analyzed and explained through experiments and modeling.

Più fonti

Libri sul tema "Aluminium melting":

Anderson, Robert John. Melting & casting aluminium [sic.]. Bradley, Il: Lindsay Publications, 1987.

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Great Britain. Energy Efficiency Office., Harwell Laboratory. Energy Technology Support Unit. e Warren Spring Laboratory, a cura di. Oxy-fuel melting of secondary aluminium: A demonstration at the Brock Metal Company Ltd. Harwell: ETSU, 1994.

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Association, Aluminum. Guidelines & definitions: By-products of aluminum melting processes. Washington, D.C: Aluminum Association, 2000.

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D, Noebe R., Kaufman M. J e United States. National Aeronautics and Space Administration., a cura di. The influence of C and Si on the flow behavior of NiAl single crystals. [Washington, DC: National Aeronautics and Space Administration, 1996.

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Melting secondary aluminium. London: Department of the Environment, 1994.

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Anderson. Melting and Casting Aluminum. Lindsay Pubns, 1987.

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Company, American Aluminum, e Aluminum Corporation of America. Melting and Casting Aluminum. University Publishing House, 1995.

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Taghiei, Mohammad Mehdi. Coalescence of aluminum alloy during salt melting process. 1988.

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Fabrication and Performance Evaluation of Mixed Fuel Fired Furnace for Aluminum Melting. India: Association of Scientists, Developers and Faculties, 2014.

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Capitoli di libri sul tema "Aluminium melting":

Henderson, Richard S., David V. Neff e Chris T. Vild. "Recent Developments in Aluminum Scrap Melting Update". In Aluminium Cast House Technology, 77–86. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118806364.ch8.

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Sjoden, Olof. "Influence of Electromagnetic Stirring on the Melting of Aluminium". In Aluminium Cast House Technology, 87–97. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118806364.ch9.

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de Groot, Jan, e Jan Migchielsen. "Multi Chamber Melting Furnaces for Recycling of Aluminium Scrap". In Aluminium Cast House Technology, 57–70. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118787304.ch6.

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Zhang, Qinsong, Mark P. Taylor e John J. J. Chen. "The Melting Behaviour of Aluminium Smelter Crust". In Light Metals 2014, 591–96. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118888438.ch100.

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Zhang, Qinsong, Mark P. Taylor e John J. J. Chen. "The Melting Behaviour of Aluminium Smelter Crust". In Light Metals 2014, 591–96. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-48144-9_100.

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Jones, Duncan. "Advanced Monolithic Refractories For Lining Aluminium Melting & Holding Furnaces". In Products, Applications & Services Showcase, 87–128. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118787915.ch4.

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Gökelma, Mertol, Trygve Storm Aarnæs, Jürgen Maier, Bernd Friedrich e Gabriella Tranell. "Behaviour of Aluminium Carbide in Al-Melts During Re-melting". In Light Metals 2019, 1033–39. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05864-7_126.

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Uriati, Federico, Filippo Da Rin Betta, Paolo Ferro, Stefano Rosso, Gianpaolo Savio, Gianmaria Concheri e Roberto Meneghello. "High Density AlSi10Mg Aluminium Alloy Specimens Obtained by Selective Laser Melting". In Lecture Notes in Mechanical Engineering, 871–78. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31154-4_74.

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Furu, Jørgen, Andreas Buchholz, Trond Harald Bergstrøm e Knut Marthinsen. "Numerical Modeling of Oxy-Fuel and Air-Fuel Burners for Aluminium Melting". In Light Metals 2012, 1037–42. Cham: Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-48179-1_180.

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Furu, Jorgen, Andreas Buchholz, Trond Harald Bergstrøm e Knut Marthinsen. "Numerical Modeling of Oxy-Fuel and Air-fuel Burners for Aluminium Melting". In Light Metals 2012, 1037–42. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118359259.ch180.

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Atti di convegni sul tema "Aluminium melting":

Famodimu, Omotoyosi H., Mark Stanford, Lijuan Zhang e Chike F. Oduoza. "Selective laser melting of aluminium metal matrix composite". In International FAIM Conference. DEStech Publications, Inc., 2014. http://dx.doi.org/10.14809/faim.2014.0739.

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Rot, David, Jiri Kozeny, Stanislav Jirinec, Jakub Jirinec, Antonin Podhrazky e Igor Poznyak. "Induction melting of aluminium oxide in the cold crucible". In 2017 18th International Scientific Conference on Electric Power Engineering (EPE). IEEE, 2017. http://dx.doi.org/10.1109/epe.2017.7967281.

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Guarino, S., e V. Tagliaferri. "Fabrication of Aluminium Foam Components by Using Powder Compact Melting Method". In ASME 7th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2004. http://dx.doi.org/10.1115/esda2004-58607.

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Abstract (sommario):

Recently, closed cell cellular metals have been gaining a very high interest due to their unique characteristic applications in various technology domains. They combine the advantages of a metal with the structural advantages of foam. Among these, aluminium foams have created a great interest due to their light weight structure and their various applications in the automotive, aerospace and allied industries. Aluminium foam possesses high stiffness and low density, it has good energy-absorbing properties making it good for crash-protection and packaging and it has attractive heat-transfer properties that permit to use these materials to cool electronic equipment and as heat exchangers in engines. However, its manufacturing techniques and characterization methods need more attention. The inadequate knowledge on the physical phenomena governing the foaming process does not allow to obtain products with repeatable characteristics. In this paper aluminium foams in various fabrication components were produced by applying the powder compact melting method. In particular metal powders (AlSi7) and powdered gas-releasing blowing agents (TiH2) were mixed and subsequently pressed to obtain a foamable precursor material. The resulting precursor was then foamed by heating it up to above its melting point. Experimental tests were performed to study the fabrication of aluminum foam components and with the extent of optimize the pressing parameters of the foamable precursor material, the foaming temperature and the heating rate during foaming. It was studied the effects of geometrical discontinuities in the mould (such as holes, restrictions, etc) on the evolution and on the morphology of metal foams.

Tsagkarakis, M., F. Villarreal, D. R. Hall, H. J. Baker e S. Williams. "Surface melting of aluminium alloys using an ultra-super-pulsed CO2 laser". In ICALEO® 2002: 21st International Congress on Laser Materials Processing and Laser Microfabrication. Laser Institute of America, 2002. http://dx.doi.org/10.2351/1.5065626.

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King, P., S. Zahiri e M. Jahedi. "Copper Particle Impact Onto Aluminium by Cold Spray". In ITSC2008, a cura di B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima e G. Montavon. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2008. http://dx.doi.org/10.31399/asm.cp.itsc2008p0720.

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Abstract Copper particles with median diameter 15.2 micrometres were cold sprayed onto a polished aluminium 1139 substrate. Under the spray conditions used, deep embedment of the copper particles occurred. The as-sprayed copper particles were dissected using a focussed ion beam (FIB), and their microstructure investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). At the crater wall an intense shear zone developed due to sliding of copper past aluminium. Evidence of melting is presented.

Quade, Ulrich, Thomas Kluth e Rainer Kreh. "Melting of Low-Level Radioactive Non-Ferrous Metal for Release". In The 11th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2007. http://dx.doi.org/10.1115/icem2007-7036.

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Siempelkamp Nukleartechnik GmbH has gained lots of experience from melting ferrous metals for recycling in the nuclear cycle as well as for release to general reuse. Due to the fact that the world market prices for non-ferrous metals like copper, aluminium or lead raised up in the past and will remain on a high level, recycling of low-level contaminated or activated metallic residues from nuclear decommissioning becomes more important. Based on the established technology for melting of ferrous metals in a medium frequency induction furnace, different melt treatment procedures for each kind of non-ferrous metals were developed and successfully commercially converted. Beside different procedures also different melting techniques such as crucibles, gas burners, ladles etc. are used. Approximately 340 Mg of aluminium, a large part of it with a uranium contamination, have been molten successfully and have met the release criteria of the German Radiation Protection Ordinance. The experience in copper and brass melting is based on a total mass of 200 Mg. Lead melting in a special ladle by using a gas heater results in a total of 420 Mg which could be released. The main goal of melting of non-ferrous metals is release for industrial reuse after treatment. Especially for lead, a cooperation with a German lead manufacturer also for recycling of non releasable lead is being planned.

Kulcsár, Tibor, e Tamás Kékesi. "Thermo-Mechanical Extraction of Aluminium from the Dross of Melting Al and AlMg Scrap". In MultiScience - XXXI. microCAD International Multidisciplinary Scientific Conference. University of Miskolc, 2017. http://dx.doi.org/10.26649/musci.2017.024.

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Hegedűs, Balázs, e Tamás Kékesi. "Leaching behaviour of the residue from the thermo-mechanical treatment of Aluminium melting dross". In MultiScience - XXXII. microCAD International Multidisciplinary Scientific Conference. University of Miskolc, 2018. http://dx.doi.org/10.26649/musci.2018.016.

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Hawksworth, Doug, e Alan Gray. "The Influence of Silicon Particle Morphology on the Melting Mechanism of Aluminium Brazing Sheet". In Vehicle Thermal Management Systems Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2005. http://dx.doi.org/10.4271/2005-01-2043.

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Loh, L. E., C. K. Chua, Z. H. Liu, D. Q. Zhang, S. L. Sing e M. Mapar. "A Numerical Study on the Melt Track in Selective Laser Melting Using Aluminium Alloy 6061". In 1st International Conference on Progress in Additive Manufacturing. Singapore: Research Publishing Services, 2014. http://dx.doi.org/10.3850/978-981-09-0446-3_028.

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Rapporti di organizzazioni sul tema "Aluminium melting":

Han, Q., e S. K. Das. Scaleable Clean Aluminum Melting Systems. Office of Scientific and Technical Information (OSTI), febbraio 2008. http://dx.doi.org/10.2172/940312.

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D'Agostini, M. D. High-Efficiency, High-Capacity, Low-NOx Aluminum Melting Using Oxygen-Enhanced Combustion. Office of Scientific and Technical Information (OSTI), giugno 2000. http://dx.doi.org/10.2172/765375.

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Sikka, V. K., C. R. Howell, F. Hall e J. Valykeo. Part A - low-aluminum-content iron-aluminum alloys. Part B - commercial-scale melting and processing of FAPY alloy. Office of Scientific and Technical Information (OSTI), giugno 1996. http://dx.doi.org/10.2172/450763.

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Dale E. Brown e Puja B. Kadolkar. Development of Cost-Effective Low-Permeability Ceramic and Refractory Components for Aluminum Melting and Casting. Office of Scientific and Technical Information (OSTI), dicembre 2005. http://dx.doi.org/10.2172/878541.

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Kadolkar, Puja, e Ronald D. Ott. Development of Cost-Effective Low-Permeability Ceramic and Refractory Components for Aluminum Melting and Casting. Office of Scientific and Technical Information (OSTI), febbraio 2006. http://dx.doi.org/10.2172/930713.

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Keiser, James R., Gorti B. Sarma, Arvind Thekdi, Meisner Roberta A., Tony Phelps, Adam W. Willoughby, J. Peter Gorog et al. Final Report, Materials for Industrial Heat Recovery Systems, Task 1 Improved Materials and Operation of Recuperators for Aluminum Melting Furnaces. Office of Scientific and Technical Information (OSTI), settembre 2007. http://dx.doi.org/10.2172/919037.

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Weiss, David C., e Gerald A. Gegal. Energy-Saving Melting and Revert Reduction Technology (E-SMARRT): Development of Elevated Temperature Aluminum Metal Matrix Composite (MMC) Alloy and Its Processing Technology. Office of Scientific and Technical Information (OSTI), aprile 2014. http://dx.doi.org/10.2172/1131418.

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Fasoyinu, Yemi, e John A. Griffin. Energy-Saving Melting and Revert Reduction Technology (E-SMARRT): Lost Foam Thin Wall - Feasibility of Producing Lost Foam Castings in Aluminum and Magnesium Based Alloys. Office of Scientific and Technical Information (OSTI), marzo 2014. http://dx.doi.org/10.2172/1131409.

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Dr. John J. Moore e Dr. Jianliang Lin. Energy Saving Melting and Revert Reduction Technology (E-SMARRT): Development of Surface Engineered Coating Systems for Aluminum Pressure Die Casting Dies: Towards a 'Smart' Die Coating. Office of Scientific and Technical Information (OSTI), luglio 2012. http://dx.doi.org/10.2172/1050628.

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NREL Scientists Reveal Origin of Diverse Melting Behaviors of Aluminum Nanoclusters (Fact Sheet). Office of Scientific and Technical Information (OSTI), ottobre 2011. http://dx.doi.org/10.2172/1027689.

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