Relevant bibliographies by topics / CaO-SiO2-Al2O3-MgO

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Academic literature on the topic 'CaO-SiO2-Al2O3-MgO'

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Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "CaO-SiO2-Al2O3-MgO"

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Doweidar, H. "Density of MgO–Al2O3–SiO2, MgO–CaO–SiO2 and MgO–CaO–Al2O3–SiO2 glasses and the structural role of MgO." Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B 61, no. 1 (February 14, 2020): 1–10. http://dx.doi.org/10.13036/17533562.61.1.12.

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Density and molar volume of MgO–Al2O3–SiO2, MgO–CaO–SiO2 and MgO–CaO–Al2O3–SiO2 glasses have been correlated with the structure by following the change in type and concentration of structural units with composition. It is assumed that for (MgO+CaO)≥Al2O3 all Al atoms form AlO4 tetrahedra. The type of modified units of SiO2 (Q3 and Q2) are determined by the ratio [(MgO+CaO)−Al2O3]/SiO2. In the case of (MgO+CaO)<Al2O3, there is a fraction of Al2O3 that forms units based on the AlO3/2 formula. The entire SiO2 content would be in the form of Q4 units. Any of the structural units has its own constant volume that is independent of the type of glass. The agreement between calculated and experimental density and molar volume strongly suggests that MgO has only a modifier role in the studied glasses. Formation of assumed MgO4, MgO5 and MgO6 polyhedra can be due to change in coordination of oxygen, rather being looked as structural units.
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Li, Wen Ping, Jun Hong Chen, Christoph Wohrmeyer, Hong Yan Guan, and Jia Lin Sun. "Study on Melting Properties of CaO-Al2O3-SiO2-MgO System Calcium Aluminate Flux." Advanced Materials Research 683 (April 2013): 569–72. http://dx.doi.org/10.4028/www.scientific.net/amr.683.569.

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Melting properties of CaO-Al2O3-SiO2-MgO system calcium aluminate (CA) flux were investigated through orthogonal design on three levels of four factors (content of CaO, Al2O3, SiO2 and MgO, respectively) to explore a reasonable chemical composition of CA flux. Results show that the softening temperature (Ts), hemispherical temperature (Th) and flowing temperature (Tf) of CA flux are influenced by the flux components in the order of SiO2 > MgO > CaO > Al2O3. The optimal chemical composition of flux is 3 wt.% SiO2, 6~12 wt.% MgO, 45 wt.% CaO and 40 wt.% Al2O3. Additionally, mineralogy composition analysis of flux clinker shows that the CA flux is mainly composed of 12CaO•7Al2O3 (C12A7), 3CaO•Al2O3 (C3A) and 6CaO•4Al2O3•MgO•SiO2 (C6A4MS, Q phase).
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Liu, Li Xia, Gang Wang, Shi Jun Wang, Yun Chi Dong, and Yi Fan Chai. "Calculation of Phase Diagram of CaO-SiO2-Al2O3-MgO-B2O3 Refining Slag without CaF2." Advanced Materials Research 512-515 (May 2012): 1558–63. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.1558.

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CaF2 is used in large quantity during refining of steel, which is harmful to environment to be found. There is more and more study on use of B2O3 in metallurgical progress. This paper studied the effects of MgO on melting performance of CaO-SiO2-Al2O3 ternary system and B2O3 on that of CaO-SiO2-Al2O3-MgO quaternary system by calculation of phase diagram. The result shows that MgO can expand the range of liquid phase of CaO-SiO2-Al2O3 ternary system while the effect on melting performance is little. B2O3 can also reduce the melting point of CaO-SiO2-Al2O3-MgO quaternary system in high CaO zone and in high Al2O3 zone. So the proper composition of MgO in refining slag are 5~8% and B2O3 below 8%.
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Zhang, G. H., K. C. Chou, and X. Y. Lv. "Influences of different components on viscosities of CaO-MgO-Al2O3-SiO2 melts." Journal of Mining and Metallurgy, Section B: Metallurgy 50, no. 2 (2014): 157–64. http://dx.doi.org/10.2298/jmmb130819016z.

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The present study is aimed to distinguish the different influences of CaO and MgO, as well as Al2O3 and SiO2 on viscosity of CaO-MgO-Al2O3-SiO2 melts. It is found that for melt without Al2O3, viscosity increases monotonously as CaO is gradually replaced by MgO. The addition of Al2O3 leads to a complex variation of viscosity. In different composition ranges, viscosity may exhibit different variation tendencies as changing the relative contents of CaO and MgO while keeping contents of other components constant. It is also found that when replacing SiO2 by equivalent mole of Al2O3, (i) in CaOAl 2O3-SiO2 system, viscosity increases when Al2O3 content is small relative to CaO content (there are enough Ca2+ ions to charge compensate Al3+ ions), but decreases when CaO content is inadequate for charge compensation; (ii) in MgO-Al2O3-SiO2 system, viscosity always decreases as substituting Al2O3 for SiO2. The reason for this difference for two systems may be resulted from the weak charge compensation ability of Mg2+ ion for Al3+ ion relative to Ca2+ ion. All the viscosity variations can be interpreted well by our new proposed viscosity model.
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Yu, Huixiang, Xinhua Wang, Jing Zhang, and Wanjun Wang. "Laboratory Study on Oxide Inclusions in High-Strength Low-Alloyed Steel Refined by Slag with Basicity 2–5." High Temperature Materials and Processes 34, no. 7 (January 10, 2015): 675–82. http://dx.doi.org/10.1515/htmp-2014-0116.

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Abstract Non-metallic inclusions in high-strength low-alloyed steel refined by slag with basicity (B) 2–5 and Al2O3 content 20%–30% (in mass percent) were investigated by slag–metal equilibrium experiments in laboratory and thermodynamic calculations. Most inclusions in equilibrium were quasi-spherical CaO-MgO-Al2O3-SiO2 system and the sizes were less than 5 µm. The average content ratio, CaO/Al2O3 and CaO/SiO2 of the inclusions, increased with slag basicity increasing when Al2O3 content in slag was around 25%, MgO/Al2O3 and CaO/Al2O3 increased with Al2O3 content in slag decreasing when slag basicity was around 3.3. The MgO/Al2O3 of the inclusions was influenced mainly by Al2O3 content in slag and CaO/Al2O3 was influenced mainly by slag basicity. To make the inclusions out of relative lower melting region (<1,773 K), the values of CaO/Al2O3, MgO/Al2O3 and (CaO+MgO)/Al2O3 of the inclusions should be enhanced by increasing basicity and decreasing Al2O3 content in slag properly.
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Wu, Huajie, Qiaoqi Li, Chongyi Wei, and Zhe Wang. "Study on the behaviour of DS-Class inclusions in advanced bearing steel." Metallurgical Research & Technology 116, no. 2 (2019): 223. http://dx.doi.org/10.1051/metal/2018096.

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The source and generated mechanisms of DS-size inclusions in bearing steel were studied by sampling systematically and using ASPEX, SEM and EDS to analyse the morphology, composition and amount of non-metallic inclusions larger than 13 µm. Two kinds of typical DS-size inclusions were found in the refining process: type I is CaO-MgO-Al2O3-SiO2 distributed evenly and wrapped by CaS; type II is composite inclusion with MgO-Al2O3 as the core, CaO-Al2O3 and CaO-SiO2 as the inner layer, covered by CaS. Based on the FactSage and thermodynamic calculations, the DS inclusions formation mechanisms were drawn. There are two formation mechanisms of the type II inclusions: one is the solid phases will precipitate from the matrix of type I inclusions as the temperature drops; another is that when the reaction time is not sufficient, the MgO∙Al2O3 spinel core will not be transformed completely, and the evolution can be summarized as: Al2O3 → MgO-Al2O3 → CaO-MgO-Al2O3 → surrounded by CaO-Al2O3(SiO2) → covered by CaS.
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Ju, Jian Tao, Sen Yang, Yan Ping Guo, Yuan She, and Zhao Hui Zhang. "Influence of Top Slag on the Plasticity of CaO-SiO2-Al2O3 Inclusions in 42CrMoA Crankshaft Steel." Materials Science Forum 804 (October 2014): 285–88. http://dx.doi.org/10.4028/www.scientific.net/msf.804.285.

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In order to control the plasticity of CaO-SiO2-Al2O3system inclusions so as to reduce the harm to the quality of 42CrMoA crankshaft steel, the target controlling ranges of CaO-SiO2-Al2O3inclusions is put forward. On the basis, influence of CaO-SiO2-Al2O3and CaO-SiO2-Al2O3-MgO system top slag on the content of calcium and aluminum in molten steel is contrasted. Theoretical research results show that, calcium activity should be controlled in the range of (90~3300)×10-10, oxygen activity should be below 7×10-6, the mass percent of calcium should be controlled more than 75ppm. And CaO-SiO2-Al2O3-MgO should be a good choice to obtain the plastic inclusions of CaO-SiO2-Al2O3.
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Chen, Xingrun, Guoguang Cheng, Jingyu Li, Yuyang Hou, Jixiang Pan, and Qiang Ruan. "Characteristics and Formation Mechanism of Inclusions in 304L Stainless Steel during the VOD Refining Process." Metals 8, no. 12 (December 5, 2018): 1024. http://dx.doi.org/10.3390/met8121024.

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The formation and characteristics of non-metallic inclusions in 304L stainless steel during the vacuum oxygen decarburization (VOD) refining process were investigated using industrial experiments and thermodynamic calculations. The compositional characteristics indicated that two types of inclusions with different sizes (from 1 μm to 30 μm) existed in 304L stainless steel during the VOD refining process, i.e., CaO-SiO2-Al2O3-MgO external inclusions, and CaO-SiO2-Al2O3-MgO-MnO endogenous inclusions. The calculation results obtained using the FactSage 7.1 software confirmed that the inclusions that were larger than 5 μm were mostly CaO-SiO2-Al2O3-MgO; the similarity in composition to the slag indicated that these inclusions originated from the slag entrapment. The CaO-SiO2-Al2O3-MgO-MnO inclusions that were smaller than 5 μm originated mainly from the oxidation reaction with Ca, Al, Mg, Si, and Mn. The changes in the inclusion composition resulting from changes in the Ca, Al, and O contents, and the temperature during the VOD refining process was larger for the smaller inclusions. Generating mechanisms for the CaO-SiO2-Al2O3-MgO-MnO inclusions in the 304L stainless steel were proposed.
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Yu, Huixiang, Dexin Yang, Muming Li, and Ming Pan. "Metallurgical characteristics of refining slag used for high manganese steel." Metallurgical Research & Technology 116, no. 6 (2019): 620. http://dx.doi.org/10.1051/metal/2019050.

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High manganese steel has excellent mechanical properties, which has garnered much attention. Whereas the research on the refining slag used for high Mn steel is very limited. In this study, the metallurgical characteristics of refining slag for high Mn steel were investigated based on thermodynamic calculation with FactSage 6.3 and slag-metal equilibrium reaction in MgO crucible. The calculated liquid zones of T ≤ 1873 K of CaO-SiO2-Al2O3-8%MgO-5%MnO system are located in the middle region of pseudo-ternary CaO-SiO2-Al2O3. For CaO-SiO2-Al2O3-8%MgO-MnO system, the apparent liquid zone at 1873 K enlarges with MnO content in slag increasing, and moves toward the direction of SiO2 and Al2O3 content increasing. For CaO-SiO2-Al2O3-MgO-MnO system, the liquidus zone shrinks with the basicity increasing, and moves toward the direction of Al2O3 content increasing. The measured MnO content in top slag reacted with high Mn steel was much higher than that reacted with conventional steels. In present experiments, the MnO content was around 5% when CaO-SiO2-Al2O3-MgO slag with basicity of 4 was in equilibrium with high Mn steel (Mn = 10, 20%) at 1873 K. The inclusions in master high Mn steel were mainly MnO type. After reaction with top slag, most inclusions transformed to MnO-SiO2 system and MnO-Al2O3-MgO system, in which the MnO content still shared the majority. Thermodynamic calculations show that SiO2 in top slag can be reduced by [Mn] in steel to supply [Si] under present experimental condition, which subsequently reacts with [O] in steel bath to form SiO2.
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Kress, V. C., and M. S. Ghiorso. "Multicomponent diffusion in MgO-Al2O3-SiO2 and CaO-MgO-Al2O3-SiO2 melts." Geochimica et Cosmochimica Acta 57, no. 18 (September 1993): 4453–66. http://dx.doi.org/10.1016/0016-7037(93)90495-i.

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Dissertations / Theses on the topic "CaO-SiO2-Al2O3-MgO"

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Jakobsson, Lars Klemet. "Distribution of boron between silicon and CaO-SiO2, MgO-SiO2,CaO-MgO-SiO2 and CaO-Al2O3-SiO2 slags at 1600°C." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-24010.

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New energy sources are needed for a sustainable future. Solar cells have a huge potential as a sustainable energy source but further development of this technology is needed for solar cells to become cost-competitive with other energy sources. Silicon produced by metallurgical refining methods has the potential of reducing the cost of crystalline silicon solar cells significantly but boron has proven to be hard to remove from silicon by these methods. Slag refining is however a promising refining method for removal of boron from silicon. The aim of this thesis was to determine accurate data for the distribution of boron between silicon and selected slags. All published values of the distribution coefficient of boron have been critically reviewed in this work. The thermodynamic properties and distribution of other major components of the system have also been reviewed. Several experiments with silicon and CaO-SiO2, MgO-SiO2, CaO-MgO-SiO2 and CaO-Al2O3-SiO2 slags have been conducted at 1600 °C under argon atmosphere. A series of experiments with ferrosilicon and CaO-SiO2 slags have also been carried out. Accurate data for the distribution of boron between silicon and CaO-SiO2, MgO-SiO2, CaO-MgO-SiO2 and CaO-Al2O3-SiO2 slags at 1600 °C has been determined. The distribution of other major slag components between slag and silicon has also been found in these slag systems. The distribution of calcium and boron between ferrosilicon and CaO-SiO2 slags at 1600 °C has been determined. Activities of slag forming components have been determined in the CaO-SiO2, MgO-SiO2 and CaO-MgO-SiO2 systems. The activity coefficient of BO1.5 at infinite dilution in these slags has also been determined. Activity coefficients of calcium, magnesium and aluminium at infinite dilution in silicon and the activity coefficient of calcium and boron at infinite dilution in ferrosilicon have been determined. An alternative equation for mass transfer has been derived and the mass transfer coefficient of boron in a 37.9%CaO-62.1%SiO2 slag has been estimated to be ks = 5.2 · 10-7m/s. The refining efficiency of CaO-MgO-SiO2 slags has been found to be approximately the same independently of slag composition with a distribution coefficient of boron between 2 and 2.5. This also includes the binary CaO-SiO2 and MgO-SiO2 systems. The activity coefficient of BO1.5 at infinite dilution in CaO-MgO-SiO2 slags, including the binary CaO-SiO2 and MgO-SiO2 systems, has been found to follow the activity coefficient of SiO2 where  . A linear decrease of the distribution coefficient was found with increasing Al2O3 content in a ternary CaO-Al2O3-SiO2 slag. This has been found to be caused by an increasing activity coefficient of BO1.5 at infinite dilution in slag relative to the activity coefficient of SiO2 where. The distribution coefficient of boron between ferrosilicon and CaO-SiO2 slags was found to be unchanged with iron content in silicon
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Lira, Claudia. "Obtenção de esmaltes vitrocerâmicos de elevado desempenho nos sistemas MgO-Al2O3-SiO2 e CaO-Al2O3-SiO2." Florianópolis, SC, 2002. http://repositorio.ufsc.br/xmlui/handle/123456789/84173.

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Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Ciência e Engenharia de Materiais.
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Este trabalho estudou a viabilidade tecnológica de obtenção de esmaltes vitrocerâmicos de elevado desempenho, caracterizando uma alta resistência à abrasão, resistência ao manchamento e ao ataque químico. Inicialmente, procedeu-se à seleção de composições adequadas para a obtenção de fritas. Esta seleção foi realizada a partir de sistemas com cristalização de fases de alta dureza e baixo coeficiente de dilatação térmica, além da facilidade de obtenção e utilização industrial das matérias-primas. Foram investigadas diversas composições nos sistemas MgO-Al2O3-SiO2 e CaO-Al2O3-SiO2, com relação ao seu comportamento térmico de sinterização e cristalização, caracterização microestrutural e dilatométrica. Foram selecionadas duas composições com características mais adequadas à obtenção de esmaltes, segundo os critérios: formação das fases cristalinas cordierita e anortita, baixa porosidade e coeficiente de dilatação térmica adequado aos suportes cerâmicos comerciais. As composições selecionadas para a obtenção de fritas foram: Mg-C2 7% Na2O (composição aproximada: 20%MgO, 24%Al2O3, 49%SiO2, 7%Na2O, % em massa), do sistema MgO-Al2O3-SiO2 e Ca-Z1 do sistema CaO-Al2O3-SiO2 (composição aproximada: 31%CaO, 13%Al2O3, 52%SiO2, 4%ZnO, % em massa). As fritas obtidas a partir das composições selecionadas foram utilizadas na formulação de esmaltes e aplicadas sobre suportes cerâmicos de grês-porcelanato para monoqueima. Para a definição dos parâmetros mais adequados de formulação do esmalte e condições de tratamento térmico foram realizados diversos testes de aplicação, segundo um delineamento experimental pelo método Taguchi. Os esmaltes testados foram avaliados com relação às características visuais, porosidade, medidas de dureza ao risco, dureza Vickers e dureza Mohs. O esmalte obtido a partir da frita Mg-C2 7% Na2O, utilizando queima à temperatura máxima de 1200°C obteve o melhor desempenho na avaliação. Este esmalte apresentou características de elevada dureza ao risco (» 15 GPa), baixa porosidade (» 2%), elevada resistência à abrasão (PEI 5), ao manchamento (classe 5) e ao ataque químico (classe GA e GLA). Estas características se mostraram compatíveis e, em muitos casos, superiores a outros materiais como vitrocerâmicos sinterizados, granito, grês-porcelanato e revestimento para piso classe PEI 5, utilizados como referência. Desta forma, o esmalte vitrocerâmico desenvolvido demonstrou características adequadas a um revestimento cerâmico de alto desempenho, com viabilidade de obtenção segundo os processos convencionais de produção em monoqueima de revestimentos cerâmicos esmaltados.
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Gao, Zimin. "Phase Relationships in the System CaO-MgO-Al2O3-SiO2 in Plagioclase Lherzolite Field." FIU Digital Commons, 1991. http://digitalcommons.fiu.edu/etd/3615.

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Unreversed phase equilibrium studies were carried out in a model mantle composition CaO-MgO-Al2O3-SiO2 (CMAS) system at 5-9 kb and 12 7 0-13 3 CPC. The experiments provide a set of data which narrowly constraints the position of the solidus in the system CMAS in the plagioclase lherzolite field. All runs were conducted in a 2.54 cm core-diameter piston-cylinder apparatus with salt-cell pressure medium. The equilibrium compositions of the mineral phases and glass were analyzed with an electron microprobe. The A12O3 contents in orthopyroxene and clinopyroxene coexisting with olivine and plagioclase increase with pressure. The deduced alumina isopleths in orthopyroxene and clinopyroxene have higher slope in P-T space than those of theoretical calculations. An empirical pyroxene geobarometer has been developed and applied to the plagioclase lherzolite xenoliths in Hawaiian basalt.
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Ponton, Clive Brian. "The mechanical properties of glass-ceramics in the system CaO-MgO-Al2O3-SiO2." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/47692.

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Dong, Pengli. "Measurements of the thermodynamic activities of chromium and vanadium oxides in CaO-MgO-Al2O3-SiO2 slags." Licentiate thesis, KTH, Materials Science and Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9940.

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In the present work, the thermodynamic activities of chromium and vanadium oxide in CaO-SiO2-MgO-Al2O3 slags were measured using gas-slag equilibration technique. The slag was equilibrated with a gas mixture of CO, CO2 and Ar gases enabling well-defined oxygen partial pressures in the gas mixture (PO2=10-3,10-4,10-5 Pa) at temperatures 1803, 1823K, 1873, 1923 K. The slags were kept in Pt crucibles during the equilibration and the duration of which was 20 h. From a knowledge of the thermodynamic activity of chromium and vanadium in Cr or V in Pt alloy, obtained from literature, and the oxygen partial pressure in the gas stream calculated by Thermo Calc software, the thermodynamic activity of chromium, vanadium oxide in the slags could be observed.An assessment of the experimental studies in earlier works reveal that, the activities of chromium at low chromium contents and vanadium in their respective alloys in platinum exhibits a strong negative deviation from ideality, the logarithms of activity coefficient of these elements were found to increase with increasing mole fractions of these metals in the Pt-alloys.Regarding the slag phase, all the chromium in the slags was assumed to be present in the divalent state in view of the low Cr contents and the low oxygen potentials employed in the present studies. Analogously, vanadium in the slag was assumed to be in the trivalent state in view of the low vanadium contents in the slag and the low oxygen partial pressure in the gas phase. Activity of chromium oxide, CrO decreases with increasing temperature and decreasing content of chromium oxide in slag and oxygen partial pressure in the gas phase. Activity of vanadium oxide, VO1.5 in slag phase shows a negative deviation from ideality. Activity coefficient of vanadium oxide shows a decrease with basicity of slag and the “break point” occurs at about slag basicity of 1 under the oxygen partial pressure of 10-3 Pa and temperature of 1873 K.A relationship for estimating the actual content of chromium, vanadium in slag as a function of activities of chromium or vanadium, temperature, oxygen partial pressure and slag basicity were developed from the present results, the agreement between the estimated and experimental values is satisfactory, especially at lower oxygen partial pressure.

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Ma, Haoyuan. "Study on preparation of high performance CaO-MgO-Al2O3-SiO2 system glass-ceramic with industrial by-products." Scholarly Commons, 2014. https://scholarlycommons.pacific.edu/uop_etds/221.

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Blast furnace slag (BFS), iron ore tailings (IOT), and coal fly ash (CFA) are common industrial by-products with huge annual yield and low reuse rate (< 30%). This research was intended to prepare high performance glass-ceramics from these three industrial by-products. What's more, two energy saving methods were put forward. One was application of single-stage heat treatment, another was mixing cold solid raw material (IOT, CFA) with melted BFS discharged at 1500 in iron making process instead of mixing all the raw material in room temperature and then heating them to melt. Different binary basicity (MCaO /MSiO2 ) and content of Al2O3 had been studied to determine the best formula for high performance glass-ceramic in terms of mechanical properties. Sample 04 (MCaO /MSiO2 =0.4, Al2O3 wt. %=9%) and Sample 05Al-2 (MCaO /MSiO2 =0.5, Al2O3 wt. %=12%) were found with the highest bending strength, 94 MPa and 89 MPa respectively. In addition, with augite and diopside as primary crystalline phase, they also had a Vickers micro-hardness of 6.2 GPa and 6.3 GPa. When applied single-stage heat treatment, sample H4 obtained a bending strength of 77.89MPa and Vickers micro-hardness of 6.5 GPa, very close to H0. Meanwhile, when applied hot liquid-cold solid mixing method, M3 obtained a bending strength of 80.51 MPa, also very close to M0. Which indicates that these two energy saving method are all feasible to be applied to prepare high performance glass-ceramic.
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Polli, Elise. "Incorporação da areia descartada de fundição (ADF) na fabricação de vitrocerâmicos do sistema SiO2 CaO MgO Al2O3." Universidade do Estado de Santa Catarina, 2014. http://tede.udesc.br/handle/handle/1654.

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The foundry is the fastest way to obtain metals pieces through the casting of liquid metal in green sand moulds. The main components of foundry sands are natural sand, bentonite and carbonaceous additive. During the foundry process, the components lose their mixture characteristics, in addition to the decrease in volume, becoming necessary the discard part of the foundry sand, generating the wasted foundry sand (WFS). In Brazil are discarded approximately 2.76 millions of tons annually and this number has become an environmental concern due to the difficulty of dispose of the residue. In this context, several lines of research aimed at waste recycling has been studied, among than the use of WSF in glass and glassceramic. This work studies the incorporation of calcined WFS replacing the pure silica in percentages 25, 50, 75 e 100% in manufacturing of glass and glassceramic belonging to the quaternary system SiO2 CaO MgO Al2O3. The samples were melted in alumina crucibles at 1400 °C for one hour. After obtaining, the vitreous samples were underwent annealing at 750 °C for half hour and after, were submitted to spectroscopy ultraviolet visible and heat treatment to 900, 950 and 1000 °C to 90 minutes. After heat treatment, the samples were sent for X ray diffraction analysis, optical microscopy, and only the samples 50 and 100% were sent to scanning electron microscopy, in order to analyze the recrystallization of the samples. For the heat treatment to 900 ° C, the crystalline phases were found akermanita and diopside. As the temperature increased to 950 ° C, the first crystals gehlenita and melilite began to appear and crystallization increased with higher heat treatment temperature. The images obtained by both microscopies relate to the formation of a dendritic structure for the samples 25, 50 and 75% for the three heat treatments. For the heat treatment at 900 ° C crystallization is related to the diopside, and for treatment at 950 to 1000 ° C is related to melilita. For the sample was 100% on both the crystallization heat treatment.
A fundição é a maneira mais rápida para a obtenção de peças metálicas através do vazamento do metal líquido em moldes de areia verde. Os principais componentes das areias de fundição são as areias bases, bentonita e pó de carvão. Durante o processo de fundição, os componentes perdem as suas características de mistura, além da diminuição de volume, tornando- se necessário o descarte de parte dessa areia de fundição, gerando a areia descartada de fundição (ADF). No Brasil são descartadas aproximadamente 2,76 milhões ton de areia anualmente e esse número passou a ser uma preocupação ambiental devido à dificuldade do descarte do resíduo. Nesse âmbito, diversas linhas de pesquisa que visam à reciclagem do resíduo vêm sendo estudadas, entre elas a utilização de ADF em vidros e vitrocerâmicos. Este trabalho estuda a incorporação de ADF calcinada em substituição a sílica pura nas porcentagens de 25, 50, 75 e 100% na fabricação de vidros e vitrocerâmicos pertencentes ao sistema quaternário SiO2 Cão MgO Al2O3. As amostras foram fundidas em cadinhos de alumina a 1400 °C durante uma hora. Após da obtenção, as amostras vítreas foram recozidas a 750 °C por meia hora e após, foram submetidas a análise de espectroscopia de ultravioleta visível e também a tratamentos térmicos a 900, 950 e 1000 °C durante 90 min. Após os tratamentos térmicos todas as amostras foram encaminhadas para a análise de difração de raios X, microscopia óptica e apenas as amostras 50 e 100% de ADF foram encaminhadas para a microscopia eletrônica de varredura, a fim de analisar a recristalização das amostras. Para o tratamento térmico de 900 °C, as fases cristalinas encontradas foram a akermanita e o diopsídio. À medida que a temperatura aumentou aos 950 °C começaram a surgir os primeiros cristais de gehlenita e melilita e a cristalização aumentou com a maior temperatura de tratamento térmico. As imagens obtidas por ambas às microscopias relatam a formação de uma estrutura dendrítica para as amostras 25, 50 e 75% ADF para os três tratamentos térmicos. Para o tratamento térmico a 900 °C a cristalização está relacionada com o diopsídio, e para os tratamentos a 950 e 1000 °C está relacionada à melilita. Para a amostra 100% ADF houve a cristalização em ambos os tratamentos térmicos.
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Welch, Mark David. "Experimental studies of selected amphiboles in the system Na2O-CaO-MgO-Al2O3-SiO2-H2O-F2 and its subsystems." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/11947.

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Земляной, К. Г. "Влияние способов измельчения на спекание материалов в системе Al2O3 – MgO – SiO2 – CaO – Cr2O3 : автореф. дис. … канд. техн. наук : 05.17.11." Thesis, б. и, 2013. http://hdl.handle.net/10995/19827.

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Vieira, Luana de Aguiar. "Estudo da sinterabilidade de materiais aluminosos obtidos através da sinterização por fase líquida no sistema Al2O3-MgO-CaO-SiO2." Universidade do Estado de Santa Catarina, 2006. http://tede.udesc.br/handle/handle/1697.

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The use of aluminium ceramic materials is a reality in many industrial fields. Though, the research development to improve the products and processes that there are nowadays are the same that have been used for the last decade. The majority of the studies aim to explore the most the potencials of alumina that, in spite of having a wide range of applications, has a great deal of its properties. This research to has the objective to obtain ceramic pieces containing hight quantities of alumina, to obtained through the sintering of liquid phase, in addiction to magnesia, kaolin, calcium carbonate and shell of oyster. The raw materials concerning are low prices and are supplier of forming elements at liquid phase: magnesium oxide (MgO), silicium oxide (SiO2), calcium oxide (CaO) respectely. The shell of oyster was used in this research to substitute commercial calcium carbonate, it reduces the price of production as well as minimizing a problem of de are litoranea in special Florianópolis, wich is the dumping of this materials in environment. With the results, it s verified that the presence of liquid phase reduces sgnificantilly the temperature. Obtaining, in this way, one alumina with high density that can be used in many kinds of application. The results also show that the formation of liquid phase and sinterability depend strongly on composition control done through the ternário diagram MgO-CaO-SiO2.
O uso de materiais cerâmicos aluminosos é uma realidade em inúmeros setores industriais. Entretanto, o desenvolvimento de pesquisas para o aperfeiçoamento de produtos e processos já existentes se mantém nas últimas décadas. A maioria destes estudos busca explorar ao máximo os potenciais da alumina que, embora possua uma vasta gama de aplicações, tem suas propriedades aproveitadas parcialmente.Este trabalho tem por objetivo a obtenção de peças cerâmicas contendo elevados teores de alumina, obtida através da sinterização por fase líquida, pela incorporação de óxido de magnésio, caulim, carbonato de cálcio comercial e casca de ostra. As matérias-primas utilizadas são de baixo custo e fornecedoras dos elementos formadores de fase líquida: óxido de magnésio (MgO), óxido de silício (SiO2) e óxido de cálcio (CaO) respectivamente. A casca de ostra foi utilizada, nesta pesquisa, como substitutivo do carbonato de cálcio comercial. Sendo assim, além de reduzir o custo de produção, a utilização da casca de ostra minimiza o problema das regiões litorâneas, em especial Florianópolis, que é a deposição incorreta deste material no meio ambiente. Os resultados obtidos comprovam que a presença da fase líquida reduz significativamente a temperatura de sinterização, obtendo-se assim um material aluminoso com elevada densidade que pode ser usado para vários fins industriais. Além disso, os resultados também demonstraram que a formação da fase líquida e a sinterabilidade dependem significativamente do controle da composição realizado através do diagrama ternário MgO-CaO-SiO2.
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Books on the topic "CaO-SiO2-Al2O3-MgO"

1

Физические свойства расплавов системы CaO-SiO2-Al2O3-MgO. М., 1987.

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Физические свойства расплавов системы CaO-SiO2-Al2O3-MgO. М., 1987.

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Book chapters on the topic "CaO-SiO2-Al2O3-MgO"

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Esfahani, Shaghayegh, and Mansoor Barati. "Crystallization Kinetics of CaO-SiO2-Al2O3-MgO Slags." In Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016, 237–44. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48769-4_25.

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Esfahani, Shaghayegh, and Mansoor Barati. "Crystallization Kinetics of CaO-SiO2-Al2O3-MgO Slags." In Advances in Molten Slags, Fluxes, and Salts, 237–44. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119333197.ch25.

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Gasparik, Tibor. "System CaO-MgO-Al2O3-SiO2 Undersaturated with Silica." In Phase Diagrams for Geoscientists, 131–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-38352-9_5.

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Gasparik, Tibor. "System CaO-MgO-Al2O3-SiO2 Saturated with Silica." In Phase Diagrams for Geoscientists, 173–213. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-38352-9_6.

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Gasparik, Tibor. "System CaO–MgO–Al2O3–SiO2 Undersaturated with Silica." In Phase Diagrams for Geoscientists, 131–72. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-5776-3_5.

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Gasparik, Tibor. "System CaO–MgO–Al2O3–SiO2 Saturated with Silica." In Phase Diagrams for Geoscientists, 173–213. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-5776-3_6.

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Monaghan, B. J., H. Abdeyazdan, R. J. Longbottom, N. Dogan, M. A. Rhamdhani, and M. W. Chapman. "Reactivity of Selected Oxide Inclusions with CaO-Al2O3-SiO2-(MgO) Slags." In Advances in Molten Slags, Fluxes, and Salts, 135–43. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119333197.ch14.

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Tao, Jun, Dongdong Guo, Baijun Yan, and Longmei Wang. "Study of MnO Activity in CaO-SiO2-MnO-Al2O3-MgO Slags." In Advances in Molten Slags, Fluxes, and Salts, 1327–33. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119333197.ch144.

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Monaghan, B. J., H. Abdeyazdan, R. J. Longbottom, N. Dogan, M. A. Rhamdhani, and M. W. Chapman. "Reactivity of Selected Oxide Inclusions with CaO-Al2O3-SiO2-(MgO) Slags." In Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016, 135–43. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48769-4_14.

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Tao, Jun, Dongdong Guo, Baijun Yan, and Longmei Wang. "Study of MnO Activity in CaO-SiO2-MnO-Al2O3-MgO Slags." In Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016, 1327–33. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48769-4_144.

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Conference papers on the topic "CaO-SiO2-Al2O3-MgO"

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Rocha, Vinicius Cardoso da, Pedro Cunha Alves, Julio Aníbal Morales Pereira, Augusto Lachini Pereira, Wagner Viana Bielefeldt, and Antônio Cezar Faria Vilela. "INCLUSION REMOVAL BY CAO-SIO2-AL2O3-MGO SLAGS IN EXPERIMENTAL CONDITIONS." In 50° Seminário de Aciaria, Fundição e Metalurgia de Não-Ferrosos. São Paulo: Editora Blucher, 2019. http://dx.doi.org/10.5151/2594-5300-33655.

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Almeida, Rodolfo Arnaldo Montecinos de, Deisi Vieira, Wagner Viana Bielefeldt, and Antônio Cezar Faria Vilela. "ANÁLISE DA SATURAÇÃO DE MgO PARA ESCÓRIAS DO SISTEMA CaO-SiO2-FeO-MgO-Al2O3." In 46º Seminário de Aciaria - Internacional. São Paulo: Editora Blucher, 2017. http://dx.doi.org/10.5151/1982-9345-26814.

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Vadász, Pavol, Dávid Medveď, Gabriel Sučik, Beatrice Plešingerová, Ľuboš Popovič, Ľuboš Ďurík, and Ľudovít Parilák. "Corrosion of high alumina castables by CaO-Al2O3-(SiO2-MgO) system slag." In THERMOPHYSICS 2019: 24th International Meeting of Thermophysics and 20th Conference REFRA. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5132741.

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Sun, L., J. Shi, J. Qiu, B. Zhang, and M. Jiang. "Phase Equilibrium in the 30% Al2O3 Plane of the Quaternary CaO-SiO2-MgO-Al2O3 System." In MS&T17. MS&T17, 2017. http://dx.doi.org/10.7449/2017/mst_2017_1258_1265.

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Sun, L., J. Shi, J. Qiu, B. Zhang, and M. Jiang. "Phase Equilibrium in the 30% Al2O3 Plane of the Quaternary CaO-SiO2-MgO-Al2O3 System." In MS&T17. MS&T17, 2017. http://dx.doi.org/10.7449/2017mst/2017/mst_2017_1258_1265.

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Bohnes, S., V. Scherer, S. Linka, M. Neuroth, and H. Bru¨ggemann. "Spectral Emissivity Measurements of Single Mineral Phases and Ash Deposits." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72099.

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The spectral and total emissivity of particulate ash deposits of different chemical composition which originate from lignite and hard coal fired boilers from Alstom Power and RWE Power were investigated with a spectral radiometer. Furthermore the emittance of all major single phases present in ashes and slag have been determined. The single phases under consideration were SiO2, Al2O3, FeO, Fe2O3, CaO and MgO. The results on SiO2, Al2O3 and MgO have already been presented by Linka in 2003 [6] and therefore the focus is on FeO, Fe2O3 and CaO in the current paper. A spectral radiometer measures the emittance as a function of temperature and wavelength. The temperature varies from 600 to 1200°C in steps of 50K. The wavelength range from 1 to 15 μm has been examined. The measurements confirm the dependency of the spectral emittance on the chemical composition. Especially the content of either FeO or Fe2O3 or CaO influences the emittance of ashes and slag. The single phase samples of FeO and Fe2O3 show a temperature dependence of the emittance in the wavelength range between 1 and 6 μm. The same character of emittance appears in samples with high fractions of FeO or Fe2O3. CaO shows no temperature dependency in the complete range of wavelengths.
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Mohan, Prabhakar, Vimalkumar Desai, Yongho Sohn, and Travis Patterson. "Degradation of Thermal Barrier Coatings by Molten CMAS (CaO-MgO-Al2O3-SiO2) Deposits." In 47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-1433.

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Pereira, Augusto Lachini, Vinicius Cardoso da Rocha, Wagner Viana Bielefeldt, and Antônio Cezar Faria Vilela. "ISO-VISCOSITY CURVES FOR CAO-SIO2-AL2O3-MGO STEELMAKING SLAGS AT HIGH TEMPERATURE." In 74º Congresso Anual da ABM. São Paulo: Editora Blucher, 2019. http://dx.doi.org/10.5151/2594-5327-33667.

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Winck, Leticia Gabriela, Wagner Viana Bielefeldt, and Antônio Cezar Faria Vilela. "ANÁLISE DE FASES DE AMOSTRAS DE ESCÓRIAS SIDERÚRGICAS DO SISTEMA CaO-MgO-Al2O3-SiO2." In 15º Enemet. São Paulo: Editora Blucher, 2017. http://dx.doi.org/10.5151/1516-392x-26701.

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TANG, Guo-zhang, Jun-guo LI, and Ya-nan ZENG. "Thermodynamic model of activity for components in CaO-MgO-Al2O3-SiO2 refining slag system." In The 2015 International Conference on Materials Engineering and Environmental Science (MEES2015). WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789814759984_0015.

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