slag corrosion and penetration behaviors of mgal 2 o 4 and
Influences of Commercial SiC and Al(2)O(3)-SiC Synthesized
The slag corrosion and penetration behaviors of MgAl2O4 MgAl2O4–ZrO2 MgAl2O4–ZrO2–CaO Al2O3 and Al2O3–ZrO2–SiC refractories were investigated using the static crucible method at 1873
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Characteristics
(MgAl 2 O 4) Spinel Characteristics As a refractory material MgAl 2 O 4 spinel has some unique applications in the form of sintered ceramics or coatings. It is considerably more resistant to slags and fluxes especially alkalis than alumina. This spinel including various chemical variations can be used to coat crucibles and tundish nozzles
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Effects of Atmospheric Conditions on Slag Corrosion
With P(O 2) = 0.21atm Mn and Fe in slag were present in the form of divalent and/or trivalent cations and were incorporated into spinel to form MnFe 2 O 4 solutions and MgAl 2 O 4 solutions during corrosion process. Since Fe Mn ions are largely consumed liquid with high viscosity formed and the continuing infiltration was suppressed.
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(PDF) Post mortem study of Al 2O 3/SiC/C/MgAl 2O 4 ceramic
Fig. 11 shows the composition image of the area at 0 mm (work face) under microstructure global view (a) further detailing in other micrographies shown by arrows (b).It was found that the MgAl 2 O 4 grain shown in Fig. 11(a) was slightly changed as a result of slag influence working as a barrier to corrosion.Further tests by using EDS made
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DESIGN OF PRECAST PREFIRED LADLE NOZZLE IN Al2O
2O 3MgAl 2O 4 spinel castable addition of spinel is very important. It has been reported 2 that Al 2O 3-rich MgAl 2O 4 spinels in a quantity ranging from 10 to 30 wt provide superior properties as compared to Al 2O 3–spinel castables. In case of Al 2O 3MgAl 2O 4 spinel castables corrosion and penetration of slag or metal are the
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EVALUATION OF THE WEAR RESISTANCE OF
Some studies of torpedo car refractory corrosion showed that the MgAl 2 O 4 spinel improves the erosion resistance and the slag penetration in high alumina refractories. The present work aims at evaluating the performance and the useful life of the generation of carried out by studying the corrosion behavior of Al 2 O 3 /C/SiC/MgAl 2 O 4
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Slag Corrosion and Penetration Behaviors of MgAl 2 O 4 and
Feb 23 2016 · The slag corrosion and penetration behaviors of MgAl 2 O 4 MgAl 2 O 4 –ZrO 2 MgAl 2 O 4 –ZrO 2 –CaO Al 2 O 3 and Al 2 O 3 –ZrO 2 –SiC refractories were investigated using the static crucible method at 1873 K for 2 h. The above refractories all displayed excellent slag corrosion resistance and their corrosion depth was less than 1.10 mm. Al 2 O 3 material was hardly corroded
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Corrosion-erosion behavior of MgAl2O4 spinel refractory in
Dec 01 2017 · Second the reaction between Al 2 O 3 released from the spinel and CaO from the slag produces a CA6 layer which protects MgAl 2 O 4 from further corrosion by the slag . There is a large variety of corrosion tests to investigate the degradation of refractory and slag or metal.
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Interfacial assessment of CaO-Al2O3-SiO2-MgO slags on
Slag CaO Al 2O3 SiO 2 MgO C/A 1 42.9 42.1 9.1 6.1 1.02 2 46.3 37.1 9.8 6.8 1.25 3 50.9 32.9 9.5 6.7 1.55 The MgAl 2O4 spinel powders were prepared from high purity laboratory grade MgO and Al 2O3 (> 99 ) starting materials by reaction sintering. These were mixed and then
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Corrosion of MgAl2O4 Spinel with Different Al2O3 Contents
The In Situ Preparation of MgAl 2 O 4 /YAG Eutectic Composites by Reaction Sintering Using Induction Heating p.111 Corrosion of MgAl 2 O 4 Spinel with Different Al 2 O 3 Contents in Iron-Containing Gasifier Slag
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Comparison study of slag corrosion resistance of MgO
Comparison study of slag corrosion resistance of MgO–MgAl2O4 MgO–CaO and MgO–C refractories under electromagnetic field Xin‑ming Ren 1 Bei‑yue Ma 1 2 Shi‑ming Li 1 Hong‑xia Li 2 Guo‑qi Liu 2 Wen‑gang Yang 2 Fan Qian 2 Shi‑xian Zhao 2 Jing‑kun Yu 1 1 Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education) School of Metallurgy
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Corrosion of spinel clinker by CaO–Al2O3–SiO2 ladle slag
First the MgAl 2 O 4 spinel that forms in this material following a reaction between MgO and Al 2 O 3 is able to trap cations from the slag on its cation sites leading to an increase of the slag
Get PriceSlag corrosion mechanism of lightweight Al2O3–MgO castable
Nov 13 2017 · With P(O 2) = 0.21 atm Mn and Fe in slag were present in the form of divalent and/or trivalent cations and were incorporated into spinel to form MnFe 2 O 4 solutions and MgAl 2 O 4 solutions during the corrosion process. Since Fe Mn ions were largely consumed liquid with high viscosity formed and the continuing infiltration was suppressed.
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Comparative evaluation investigation of slag corrosion on
Dec 15 2017 · From EDS analysis of point 2 the ratio of MgO to Al 2 O 3 in the spinel phase is 18.3/81.7 which rather fits with MgAl 2 O 4. The MgAl 2 O 4 phase in the MgO-Al 2 O 3 crucible plays an important role in resisting slag corrosion. 3.3. Slag penetration observation
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Ceramics Free Full-Text Corrosion of MgO-C with
An efficient MgAl 2 O 4 spinel additive for improved slag erosion and penetration resistance of high-Al 2 O 3 and MgO-C refractories. Ceram. Int. 2002 28 245–253. Google Scholar Das R.R. Nayak B.B. Adak S. Chattopadhyay A.K. Influence of nanocrystalline MgAl 2 O 4 spinel addition on the properties of MgO-C refractories. Mater. Manuf.
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The Effect of Carbon Nanoparticles and Calcined Alumina on
and slag penetration. Based on EDS results in Fig. 7 chemical compound in A point was close to MgAl 2 O 4 spinel phase. In fact this along with XRD pattern in Fig.5 confirmed the in situ formation of spinel-MA (MgAl 2 O 4 spinel phase) in the MGA sample. Fig. 4. Stereoscopic image of the surface corrosion of the
Get PriceCorrosion resistance of alumina-magnesia castable to slag
2O 3MgO CaOSiO 2 system. The slag corrosion was simulated thermodynamically for CA6 alumina spinel and castables. The solubility of each oxide component is expected in the order of MgAl 2O 4 > CA6 > Al 2O 3 at 1600°C because of the formation of CA2 on CA6 and the formation of CA2 and CA6 on alumina suggesting the protection of
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Dynamic wetting of CaO-Al2O3-SiO2-MgO liquid oxide on
reaction and/or a change in the physical characteristics of the slag with increasing alumina. In this study the dynamic contact angles of slags in the CaO-Al. 2. O. 3-SiO. 2-MgO system on a ceramic repre-senting an MgAl. 2. O. 4. spinel-type inclusion were mea-sured using a modified sessile drop technique similar to that used by Choi and Lee
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Reaction behavior of slag and spinel in steel ladle castables
durability of A-M castable for slag penetration and corrosion was discussed. 2. Experiments 2.1 Preparation of A-Sp and A-M castables The formulations of A-Sp and A-M castables used in the present work are listed in Tab le1. The raw materials were of industrial grade in
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Corrosion mechanism of MgAl2O4–CaAl4O7–CaAl12O19
Jul 01 2017 · Corrosion behaviors and corroded microstructures of MgAl 2 O 4-CaAl 4 O 7-CaAl 12 O 19 composites containing various additives (ZrO 2 and TiO 2) against steel ladle slag (containing CaF 2) were investigated using a reaction test method at 1600 °C. Thermodynamic calculation based on the Al 2 O 3 –CaO–MgO phase equilibrium diagram was used to further reveal the corrosion mechanism.
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Direct and indirect slag corrosion of oxide and oxide-c
through the slag. Examples of passive corrosion include the formation of a dense MgO layer in MgO-graphite refractories of a MgAl 2O 4 spinel layer in the corrosion of alumina refractories by MgO containing slags and of a C 2S layer on MgO-dolomite refractories attacked by silica containing slags. Selective corrosion may also occur in DkT r
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Magnesium Aluminate Spinel Raw Materials for High
making due to their particular combination of resistance to steel-making slag corrosion thermal shock resistance and excellent hot strength. paper will refer to MgAl2O4 the mineral spinel which is the only compound in the tendency for slag penetration. Experimental tests of slag resistance were carried out using basic (C/S = 2.3) and
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Corrosion resistance of alumina-magnesia castable to slag
2O 3MgO CaOSiO 2 system. The slag corrosion was simulated thermodynamically for CA6 alumina spinel and castables. The solubility of each oxide component is expected in the order of MgAl 2O 4 > CA6 > Al 2O 3 at 1600°C because of the formation of CA2 on CA6 and the formation of CA2 and CA6 on alumina suggesting the protection of
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Dynamic Wetting of CaO-Al 2 O 3 -SiO 2 -MgO Liquid Oxide
The strength of the attachment can be in part characterized by the wettability of the liquid oxide on the inclusions. In this study the dynamic wetting of liquid oxides of the CaO-Al 2 O 3-SiO 2-MgO system on a solid spinel (MgAl 2 O 4) substrate with low porosity of 1.9 pct was measured at 1773 K (1500 °C) using a modified sessile drop
Get PriceInterfacial assessment of CaO-Al2O3-SiO2-MgO slags on
Slag CaO Al 2O3 SiO 2 MgO C/A 1 42.9 42.1 9.1 6.1 1.02 2 46.3 37.1 9.8 6.8 1.25 3 50.9 32.9 9.5 6.7 1.55 The MgAl 2O4 spinel powders were prepared from high purity laboratory grade MgO and Al 2O3 (> 99 ) starting materials by reaction sintering. These were mixed and then
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Reaction behavior of slag and spinel in steel ladle castables
durability of A-M castable for slag penetration and corrosion was discussed. 2. Experiments 2.1 Preparation of A-Sp and A-M castables The formulations of A-Sp and A-M castables used in the present work are listed in Tab le1. The raw materials were of industrial grade in
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International Journal of Minerals Metallurgy and Materials
On the basis of the microstructural analysis and mechanisms calculations the corrosion resistance behavior of the MgO-MgAl 2 O 4-ZrO 2 composite is attributable to its highly dispersed structure which helps protect the high activity of ZrO 2. When in contact with the slag ZrO 2 reacts with CaO to form the stable phase CaZrO 3 which protects
Get PriceEffects of Atmospheric Conditions on Slag Corrosion
With P(O 2) = 0.21atm Mn and Fe in slag were present in the form of divalent and/or trivalent cations and were incorporated into spinel to form MnFe 2 O 4 solutions and MgAl 2 O 4 solutions during corrosion process. Since Fe Mn ions are largely consumed liquid with high viscosity formed and the continuing infiltration was suppressed.
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Characteristics of Interface between MgAl2O4 Spinel and
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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