the reaction interface between mgo and al2o3
Dissolution Behavior of Al2O3 and MgO Inclusions in the
3 and MgO particles varied depending on slag compositions. Reaction products such as CaO·6Al 2O 3 CaO·2Al 2O 3 and Ca 2Al 2SiO 7 formed on the surface of Al 2O 3 particle. Surprisingly however in the case where reaction prod-ucts were MgAl 2O 4 and Ca 2SiO 4 phases these reaction products formed ring-like structure around MgO particles.
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The Role of Graphite in Refractories such as Al2O3/MgO/C
carbon was found in the interface between deteriorative layer of the refractory and slag film. Corrosion mechanism of AC refractories in the smelting reduction melts with iron bath 1. graphite oxidization 2. deteriorative layer formation. The deteriorative layer of Al 2 O 3-C refractory was corroded greatly by the smelting reduction melts.
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Kinetics of the reaction MgO Al2O3 → MgAl2O4 and Al-Mg
A simple model can be used to separate the two effects and show that the reaction potential (i.e. the MgO-Al2O3 phase diagram) is sensitive to changes in both temperature and pressure whereas the
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Heterogeneous reaction of acetic acid on MgO α-Al2O3 and
Mixtures of organic compounds with mineral dust are ubiquitous in the atmosphere whereas the formation pathways and hygroscopic behavior of these mixtures are not well understood. In this study in situ DRIFTS XRD and a vapor sorption analyzer were used to investigate the heterogeneous reaction of acetic acid on α-Al 2 O 3 MgO and CaCO 3 particles under both dry and humid conditions
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Interfacial Reaction between Al2O3–SiO2–C Refractory and
FeO–SiO2–Al2O3–MgO exist in the reacted layer which has Figure 4(a) shows the interface formed by the reaction between the preheated Al2O3–SiO2–C refractory and liquid Fe containing 0.1 mass of Al for 3 hours at 1823 K. As can be expected by the Reactions (1) to (3) the lower
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Insulating MgO–Al2O3–LDPE Nanocomposites for Offshore
In this work the heat insulating Al2O3 nanoparticles are added to the MgO–polyethylene nanocomposite to observe the effect of the interface between mix oxide nanoparticles on current density and breakdown strength of the nanocomposite compared to the MgO–polyethylene nanocomposite at room and elevated temperatures (90 °C).
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Nature of MgO and Al2O3 Dissolution in Metallurgical Slags
the chemical reaction at oxide/slag interface. Compar-ison between the measured and calculated dissolution curve by Liu and Wang et al. 15 16 indicated that MgO dissolution is likely controlled by mass transfer in slag. Despite their different conclusions most of the research-ers (both for Al 2O 3 and MgO dissolution) used the
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Effect of Slag Composition on MgO·Al2O3 Spinel-Type
decrease in the activity of MgO in the slag and an increase in the oxygen activity at the interface between the molten steel and slag when the CaO/SiO 2 and CaO/Al 2O 3 of the slag were lower. Therefore the forma-tion of spinel-type inclusions can be determined by the relationship between the MgO activity of the slag
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Aluminium oxide Al2O3 Reactions
Al2O3ALUMINIUM OXIDE. Reactions. Reactions with Aluminium oxide Al2O3. Obtaining Aluminium oxide Al2O3. Properties alumina does not react with water dilute acids and alkalis
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A high-resolution electron microscopy study of mgo/al2o3
Abstract. MgO films were deposited on the Al2O3 prism plane and the (0001) Al2O3 basal plane of sapphire by molecular beam epitaxy (MBE). Cross-sectional specimens with thicknesses of less than 15nm were prepared so that the MgO/Al 2 O 3 interface could be investigated by high resolution electron microscopy (HREM). Two different orientation relationships were obtained for MgO films deposited
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Modification Kinetics of MgO–Al2O3 Inclusions by Ca-treatment
The modification mechanism is (1) diffusion of the dissolved Ca in the boundary layer (2) diffusion of Ca in the CaO–Al2O3–MgO inclusions (3) reaction between Ca and MgO–Al2O3 at the interface (4) diffusion of the dissolved Mg in the inclusions and (5) diffusion of the dissolved Mg in the boundary layer.
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The reaction interface between MgO and Al2O3NASA/ADS
Jul 01 2006 · adshelp at cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A
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Influence of microstructure on hardness of plasma sprayed
Nov 30 2017 · It can be found that interface diffusion and formation of the new phase can promote crack healing. The formation of new phases MgAl 2 O 4 in the crack zones is shown in figure 13(b). The reaction of new phases could be described as equation . The structure of MgO α-Al 2 O 3 and MgAl 2 O 4 is shown in figure 14.
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Interfacial Reaction Between CaO-SiO2-MgO-Al2O3 Flux and
Apr 20 2012 · This study investigated the interfacial reaction kinetics and related phenomena between CaO-SiO2-MgO-Al2O3 flux and Fe-xMn-yAl (x = 10 and 20 mass pct y = 1 3 and 6 mass pct) steel which simulates transformation-induced plasticity (TRIP) and twinning-induced plasticity (TWIP) steels at 1873 K (1600 °C). It also examines the effect of changes in the composition of the steel and slag
Chat OnlineInterfacial Reaction Between CaO-SiO2-MgO-Al2O3 Flux and
Apr 20 2012 · This study investigated the interfacial reaction kinetics and related phenomena between CaO-SiO2-MgO-Al2O3 flux and Fe-xMn-yAl (x = 10 and 20 mass pct y = 1 3 and 6 mass pct) steel which simulates transformation-induced plasticity (TRIP) and twinning-induced plasticity (TWIP) steels at 1873 K (1600 °C). It also examines the effect of changes in the composition of the steel and slag
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Interfacial Reaction between Al2O3–SiO2–C Refractory and
FeO–SiO2–Al2O3–MgO exist in the reacted layer which has Figure 4(a) shows the interface formed by the reaction between the preheated Al2O3–SiO2–C refractory and liquid Fe containing 0.1 mass of Al for 3 hours at 1823 K. As can be expected by the Reactions (1) to (3) the lower
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Thermodynamics of Reactions Among Al2O3 CaO SiO2 and
Nov 15 2010 · The relationships between Δ G T θ and temperature (T) are shown in figure 11. Figure 11 shows that except for C 3 AS 3 (Hessonite) all the Δ G T θ of the reactions get more negative with the temperature increasing the thermodynamic order of generating ternary compounds at sintering temperature of 1473K is C 2 AS(cacoclasite) C 4 AF
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R ole of Oxygen in Spinel Formation from MgO and Al2O3
by the reaction of MgO and Al2O3 consists of two layers one is a thick layer continuous with the Al2O3 crystal and the other is a thinner layer grown on the outer side. Fig. 3 and Fig. 4 show that the 18O concentration changes very sharply at the interface of two spinal layers. It was
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(PDF) Effect of MgO Additive on Microstructure of Al2O3
The effect of polymorphism of Al2O3 on sintering and grain growth of magnesia aluminate spinel was studied. γAl2O3 and αAl2O3 were mixed with MgO according to the stoichiometric MA ratio
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A high-resolution electron microscopy study of mgo/al2o3
Abstract. MgO films were deposited on the Al2O3 prism plane and the (0001) Al2O3 basal plane of sapphire by molecular beam epitaxy (MBE). Cross-sectional specimens with thicknesses of less than 15nm were prepared so that the MgO/Al 2 O 3 interface could be investigated by high resolution electron microscopy (HREM). Two different orientation relationships were obtained for MgO films deposited
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Nature of MgO and Al 2 O 3 Dissolution in Metallurgical
Aug 28 2015 · The nature of MgO and Al2O3 dissolution in metallurgical slags may affect production cost efficiency and product quality. However the rate-limiting dissolution mechanism chemical reaction or boundary layer diffusion is not well understood. In the present report the dissolution mechanism of MgO and Al2O3 in metallurgical slag was evaluated based on available literature data.
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Reactions in Al2O3 Mg metal matrix composites during
Sep 15 1993 · At the two higher temperatures extensive reaction between δ-Al 2 O 3 fibres and the Mg matrix had occurred after 200–300 h. During this time Mg and Al 2 O 3 reacted to form MgO (but not spinel) and Al which dissolved into the matrix. When the
Chat OnlineNature of MgO and Al 2 O 3 Dissolution in Metallurgical
Aug 28 2015 · The nature of MgO and Al2O3 dissolution in metallurgical slags may affect production cost efficiency and product quality. However the rate-limiting dissolution mechanism chemical reaction or boundary layer diffusion is not well understood. In the present report the dissolution mechanism of MgO and Al2O3 in metallurgical slag was evaluated based on available literature data.
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3rd Indonesian Iron and Steel Conference Institut Teknologi Bandung 26-27 September 2013 V.4hal. 144 Characteristics of Interface between MgAl 2 O 4 Spinel and CaO-Al 2 O 3-SiO 2-MgO Slag H. Abdeyazdan1 M.A. Rhamdhani2 N. Dogan1 M. Chapman3 B.J. Monaghan1 1PYROmetallurgical Research Group University of Wollongong Australia 2HTP Group Swinburne University of
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Interfacial Reaction Between CaO-SiO2-MgO-Al2O3 Flux and
Interfacial Reaction Between CaO-SiO2-MgO-Al2O3 Flux and Fe-xMn-yAl (x = 10 and 20 mass pct y = 1 3 and 6 mass pct) Steel at 1873 K (1600 °C) By Dong Jin Kim and Joo Hyun Park Cite
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Electron microscopy observations of the spinel-forming
Aug 27 2015 · Crystallographic orientation relationships (ORs) between the sapphire (Al 2 O 3) substrate the magnesia (MgO) smoke nanoparticles and the MgAl 2 O 4 spinel reaction products were studied before and after annealing in the temperature range between 1000 and 1100 °C. The ORs adopted between the different pairs of materials were studied using
Chat OnlineNature of MgO and Al 2 O 3 Dissolution in Metallurgical
Aug 28 2015 · The nature of MgO and Al2O3 dissolution in metallurgical slags may affect production cost efficiency and product quality. However the rate-limiting dissolution mechanism chemical reaction or boundary layer diffusion is not well understood. In the present report the dissolution mechanism of MgO and Al2O3 in metallurgical slag was evaluated based on available literature data.
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High Alumina Slag and Blast Furnace OperationIspatGuru
May 27 2013 · Physical effects of increased MgO content in the slag are just the opposite to those of Al2O3. MgO helps in the maintenance of good slag drainage from the hearth during tapping. As the level of MgO increases in the high Al2O3 slag the S content of HM improves for a given range of Si. This is probably due to the higher fluidity of the high MgO
Chat OnlineReactivity and Microstructure of Al2O3-Reinforced
To better investigate the interaction between aluminum oxide particles and magnesium alloys first thermodynamical calculation was performed. According to free Gibbs energies the formation of MgO and MgAl 2 O 4 is thermodynamically favorable as shown in the following reactions During the process the melt is covered with the Ar/SF6 cover gas mixture and it is poured into the cylindric
Chat OnlineKinetics of the reaction MgO Al2O3 → MgAl2O4 and Al-Mg
A simple model can be used to separate the two effects and show that the reaction potential (i.e. the MgO-Al2O3phase diagram) is sensitive to changes in both temperature and pressure whereas the governing diffusivity depends only on temperature.
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