thermal evolution of al2o3 mgo c refractories
Influence of Additives on Slag Resistance of Al2O3‐SiO2
Jan 20 2005 · The microstructures of Al 2 O 3 –SiO 2 –SiC–C refractory matrices with aluminum silicon Si 3 N 4 BN B 2 O 3 and B 4 C additives are characterized before and after a crucible slag test and the phases present are compared to those expected at thermodynamic equilibrium. The carbon content dominates the resistance to CaO–MgO–Al 2 O 3 –SiO 2 slag penetration while the viscosity Jan 01 2012 · MgO.Al 2 O 3 spinel is generally formed from 1000 °C depending on the atmosphere the grain size and purity of magnesia (BaudÃn 1999 Kamiide et al. 2001 Rigaud et al. 1995) by reaction between MgO and a) original fine alumina grains b) aluminum or c) the Al 2 O 3 coming from the decomposition of Al 4 C 3 .
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Thermal Evolution of Al2O3-MgO-C RefractoriesScienceDirect
Jan 01 2012 · MgO.Al 2 O 3 spinel is generally formed from 1000 °C depending on the atmosphere the grain size and purity of magnesia (BaudÃn 1999 Kamiide et al. 2001 Rigaud et al. 1995) by reaction between MgO and a) original fine alumina grains b) aluminum or c) the Al 2 O 3 coming from the decomposition of Al 4 C 3 . Jan 20 2005 · The microstructures of Al 2 O 3 –SiO 2 –SiC–C refractory matrices with aluminum silicon Si 3 N 4 BN B 2 O 3 and B 4 C additives are characterized before and after a crucible slag test and the phases present are compared to those expected at thermodynamic equilibrium. The carbon content dominates the resistance to CaO–MgO–Al 2 O 3 –SiO 2 slag penetration while the viscosity
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Thermal Evolution of Al2O3-MgO-C RefractoriesCORE
Download PDF Sorry we are unable to provide the full text but you may find it at the following location(s) https //doi/10.1016/j.mspr (external link) MgO-C (magnesia-carbon) refractory bricks are widely used in steel industry the primary consumer of refractory linings such as basic oxygen furnaces electric arc furnaces and ladle furnaces. The steelmaking requires extreme chemical thermal and mechanical conditions that demand a high performance of materials able to withstand the action
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Physical chemical and thermal characterization of alumina
Aug 01 2014 · Similar to other published papers dealing with the analytical characterization of MgO–C and Al 2 O 3 –MgO–C refractories the aim of the this research is to establish a methodology for the comprehensive analysis of AMC-type commercial refractories while including other aspects besides their chemical and mineralogical composition such as their microstructure texture thermal behavior and The effect of α-Al 2 O 3 nanoparticles (up to 5 wt. ) on the physical mechanical and thermal properties as well as on the microstructural evolution of a dense magnesia refractory is studied. Sintering temperatures at 1300 1500 and 1600 °C are used.
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Evolution of in Situ Refractories in the 20th Century
Junfeng Chen Nan Li Wen Yan Yaowu Wei and Bingqiang Han Influence of Ti3AlC2 on microstructure and thermal mechanical properties of Al2O3-Ti3AlC2-C refractories Jun 01 2016 · Al 2 O 3–MgO–C is increasingly being used in refractories for secondary steelmaking especially for ladle applications due to their particular combination of resistance to slag corrosion high thermal shock resistance and excellent hot strength.
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The Role of Graphite in Refractories such as Al2O3/MgO/C
Refractories MgO-C (MC) refractories for basic/electric arc furnaces SEM 16.10.13 page 20 RF Formation of a dense zone due to reduction of MgO with C at high T which vaporized the Mg and precipitated it in the dense zone. I. Strawbridge D.G. Apostolopoulos High Purity Magnesias and Graphites in Magnesia- Its formula is 2MgO.SiO 2 with 60-70 MgO and 15-20 SiO 2 which has stable existence above 1600 C. They have high refractoriness high temperature strength resistance to basic slag erosion resistance excellent thermal stability acidic slag also has some adaptability
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(PDF) Microstructure evaluation of MgO–C refractories with
They report in the case of Al additions in MgO-C refractories MgAl 2 O 4 and Al 4 C 3 phases are observed in the refractory bulk and a large amount of protective MgAl 2 O 4 phase is formed due to the decomposition of Al 4 C 3 phases on the refractory-metal reaction interface. This work directly links the performance with the phase evolution in the MgO-Al2O3-SiO2-H2O system during the hydrothermal treatment. Cement-free refractory binders considered as alternative to calcium aluminate cements with the chemical compositions fine-grained mixtures of MgO-Al2O3 MgO-Al2O3-SiO2 and MgO-SiO2 reactive powders were subjected conversion from dry mixture to hydrated matrix
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Thermal characteristics of Al2O3–MgO and Al2O3–spinel
The field trials confirmed that Al2O3–MgO castables have better slag resistance and a longer service life for use in steel ladles compared to Al2O3–spinel castables. The importance of thermal Aluminium Oxide (Al2O3) or alumina is one of the most versatile of refractory ceramic oxides and finds use in a wide range of applications.
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Thermomechanical behaviour of Al2O3-MgO-C refractories
Al2O3–MgO–C (AMC) refractory bricks are used as linings for the sidewalls (metal line) and bottoms of steel-making ladles. As a structural component of this type of vessel these bricks undergo mechanical and thermal loading in service. For this reason knowledge about their thermo-mechanical behavior is needed for material selection and The field trials confirmed that Al2O3–MgO castables have better slag resistance and a longer service life for use in steel ladles compared to Al2O3–spinel castables. The importance of thermal
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A new ternary phase in the system CaO–Al2O3–Cr2O3 Crystal
From the evolution of the lattice parameters the thermal expansion tensor has been obtained. A pronounced anisotropy is evident. The response of structural building units to variable tempera-ture has been discussed. KEYWORDS crystal growth layered crystal structures phase equilibria refractories thermal expansion Aluminium Oxide (Al2O3) or alumina is one of the most versatile of refractory ceramic oxides and finds use in a wide range of applications.
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Chemical wearing mechanism of refractory materials in a
Thermal evolution of Al2O3-MgO-C refractories. December 2012 · Procedia Materials Science. V. Muñoz Analia GLADYS Tomba Martinez In spite of the high cost of bauxite Al2O3-MgO-C refractory refractories MgO–C spinel ladle. References 1 Figueiredo Jr. A. et al. Technological evolution of magnesia-carbon bricks for steel ladles in Argentina. Iron and Steel Technology 1 (2004) 42–47 2 Tripathi H.S. Ghosh A. Spinelisation and properties of Al2O3-MgAl2O4-C refractory Effect of MgO and Al2O3 reactants. Ceramic Int. 36
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AluminaAluminium OxideAl2O3A Refractory Ceramic Oxide
Aluminium Oxide (Al2O3) or alumina is one of the most versatile of refractory ceramic oxides and finds use in a wide range of applications. The in situ nitrides bonded MgAl2O4-C refractories were prepared by using high quality fused spinel (MgAl2O4 ≥ 97 ) natural flake graphite (C ≥ 96 ) and silicon powder (Si ≥ 98 ) as raw materials and the liquid calcium lignosulfonate with a concentration of 1.25 g/ml was used as binder (4 wt ). The effect of sintering temperatures on physical properties and phase compositions were
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Keywords recycling Al2O3-C secondary raw materials Al2O3-C-SiC refractories torpedo ladles. Abstract References Full Article Utilization of Waste Products in Refractory Materials. Lucie Vodová Karel Lang Pavel Kovár Lukáš Tvrdík. Volume 8 Issue 4 Pages 5966. Keywords energy by-products class F fly ash class C fly ash In the compositions for the system MgO∶Al2O3∶ZrO2=1∶1∶1 fired at 1750° with the use of original components of different chemical activity conditions are created for partial stabilization of the monoclinic zirconium dioxide on account of the magnesia which has not succeeded in reacting with the alumina resulting in the formation of spinel.
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Properties of AMC refractories
Industry News Properties of AMC refractories AMC refractories are developed on the basis of high-performance magnesia and aluminium carbonaceous refractories which are also an alternative material to high-alumina and dolomite brick ladle lining. But in contrast made by acid-based two kinds of fire-resistant oxides the aluminum-magnesium-carbon brick not only has excellent Thermal evolution of Al2O3-MgO-C refractories. December 2012 · Procedia Materials Science. V. Muñoz Analia GLADYS Tomba Martinez In spite of the high cost of bauxite Al2O3-MgO-C refractory
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Alumina-rich refractory concretes with added spinel
L.A. D´ ıaz et al. / Journal of the European Ceramic Society 25 (2005) 1499–1506 1501 Fig. 1. (A) Al2O3–MgO–CaO ternary phase equilibrium diagram (B) alumina-rich zone and (C) location of all the designed compositions in the alumina rich zone. 2.1.2. Grain Junfeng Chen Nan Li Wen Yan Yaowu Wei and Bingqiang Han Influence of Ti3AlC2 on microstructure and thermal mechanical properties of Al2O3-Ti3AlC2-C refractories
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Paperrefractories-worldforum
refractories MgO–C spinel ladle. References 1 Figueiredo Jr. A. et al. Technological evolution of magnesia-carbon bricks for steel ladles in Argentina. Iron and Steel Technology 1 (2004) 42–47 2 Tripathi H.S. Ghosh A. Spinelisation and properties of Al2O3-MgAl2O4-C refractory Effect of MgO and Al2O3 reactants. Ceramic Int. 36 Based on XRD peak intensity measurements the γ-Al2O3 almost completely passed (95 ) into α-Al2O3 after 180 min of activation in vibratory ball mill and subsequent thermal treatment (2 h/1200 °C). SEM microphotographs with accompanying image analysis PC program highlighted changes in size and shape of particles of initial and synthesized Al 2O3.
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(PDF) Thermal evolution of Al2O3-MgO-C refractories
Thermal evolution of Al 2O3-MgO-C refractories V. Muñoz A. G. Tomba Martinez Instituto de Inve stigaciones en Cien cia y Tecnolog ía de Materiales (INTEMA) CONICETFacultad de Ing eniería Results of a thermodynamic analysis of the relation ΔG = f(T) for solid-phase reactions between stoichiometric components of the MgOAl2O3SiO2 system are reported and the thermodynamic conjugation of solid-phase reactions is considered. The thermodynamic instability of stoichiometric sapphirine and cordierite is discussed. A general scheme for the interaction between
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4.6 Some properties of nano carbon added low carbon MgO-C bricks . compared with the 10 graphite containing MgO-C brick 59-67 . 4.6.1 Corrosion resistance 59-61 . 4.6.2 Thermal shock resistance 61-62 . 4.6.3 Microstructure 63-65 . 4.6.4 Pore size distribution 65-66 Jan 16 2014 · Thermal diffusivity (D) was measured up to 1 800 K of refractory materials using laser-flash analysis which lacks radiative transfer gains and contact losses. The focus is on single-crystal MgO and Al2O3. These data are needed to benchmark theoretical models and thereby improve understanding of deep mantle processes. Measurements of AlN Mg(OH)2 and isostructural BeO show that the
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