Masses in the MgO-Al2O3-Cr2O3 system

Kashcheev, I. D.; Novozhilov, N. Yu.; Mezentseva, N. E.; Tsarevskii, B. V.; Seliverstov, N. F.; Ryabin, V. A.; Kalitina, L. N.

doi:10.1007/bf01386868

Cited by 2 publications

(6 citation statements)

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“…10). This is explained by the surface tension of molten steel decreasing with temperature, in agreement with the literature data [8,13,15,17].…”

Section: Contact Duration and Temperaturesupporting

confidence: 87%

“…Possibly, this may imply that the substrate surface is coated with a glass-like phase. Data have been reported in the literature [16,17] that the angle q tended to decrease with addition of SiO 2 to the corundum refractory material; however, no results were available on the increased SiO 2 concentration in the contact zone.…”

Section: Additive To Glass Fiber Substratementioning

confidence: 86%

“…In [13 -16], the wettability of aluminosilicate refractories by steel or iron was studied; in [17], the effect of Steel 35 on corundum composites was studied, and in [20], the wetting angle q at zirconium surfaces and molten iron was measured. MgO is the most widely used material for manufacturing the tundish lining; still, data on the wettability of periclase lining by molten steel and the effect of additives on wettability are sadly lacking [7,22].…”

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confidence: 99%

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Wettability of tundish periclase lining by steel

et al. 2006

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Results of a study of the wettability of the tundish periclase lining by molten steel using a sessile drop method are presented. The wetting angle q tends to decrease with increase in temperature and contact time on adding glass fiber and Fe 2 O 3 powder in excess of 2% to the magnesite powder; a similar effect is observed in steels high in manganese. An increase in angle q is observed on adding carbon fiber or glass fiber (not in excess of 1%) to the magnesite powder; the angle q tends to increase with increase in MgO powder grain size and with carbon contained in steel in excess of 0.04%.In recent years, there has been an increased demand for steels with a low impurity content. Technologically, the tundish ladle is the last refractory-lined vessel in which the molten steel is processed metallurgically before pouring into molds. MgO-based refractory materials are preferred for making the hot layer of the refractory lining of the tundish ladle. To increase the strength of the lining (normally applied using a gunning technique), additives are introduced into the gunning mix -paper fiber (coarse-or fine-fibrous), mineral wool, glass fiber, expandable clay, and polystyrene beads [1 -3].The interaction between tundish lining and molten steel and slag is an important concern for manufacturing high-purity steels. This interaction involves two related phenomena: wetting and reaction between the three components, which determines the service life of the refractory and the properties of molded preforms, slabs, and blooms [4,5]. To determine the wettability of a solid substrate by molten metal, Young's equation is conventionally used [6]:where q is the wetting angle, deg; g SV is the surface tension of the solid; g SL is the energy of surface interaction between the liquid and the solid; g LV is the surface tension of the liquid. As is known, the liquid wets the solid if q < 90°; in unwettable systems, it is q > 90°.Data have been reported on the wettability of various refractory surfaces [7 -21] by molten iron and steel [7 -9] and on their interaction with gas media [7 -9, 11, 21] and molten slag [7 -9].In [13 -16], the wettability of aluminosilicate refractories by steel or iron was studied; in [17], the effect of Steel 35 on corundum composites was studied, and in [20], the wetting angle q at zirconium surfaces and molten iron was measured. MgO is the most widely used material for manufacturing the tundish lining; still, data on the wettability of periclase lining by molten steel and the effect of additives on wettability are sadly lacking [7,22]. Therefore our goal in this work was to study the wettability of MgO by molten steel. EXPERIMENTALThe low-carbon steels were made available from the Eregli Iron and Steel Works (Turkey); their composition is given in Table 1. The tests were carried out by a sessile drop method; the test specimens were cubes of steel weighing about 0.3 g; the substrate was a magnesite powder of composition, wt.%: MgO, 95.08; SiO 2 , 2.49; CaO, 1.73; Fe 2 O 3 , 0.54; Al 2 O 3 , 0.16. The powde...

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“…10). This is explained by the surface tension of molten steel decreasing with temperature, in agreement with the literature data [8,13,15,17].…”

Section: Contact Duration and Temperaturesupporting

confidence: 87%

Section: Additive To Glass Fiber Substratementioning

confidence: 86%

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confidence: 99%

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Wettability of tundish periclase lining by steel

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“…As previously conducted studied [1- 4,6] showed, when the basicity of the slag acting on a refractory changes from basic to acidic, the content of MgAI204 in the refractory must be decreased and the content of MgCr20 ~ must be increased. The optimum compositions of magnesium aluminate and chromite were determined in two subgroups: i) MgCr20 ~ content <50% and 2) >50%.…”

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confidence: 98%

“…Based on the results of the conducted studies and an analysis of the published data [2][3][4], we identified three main systems, viz., I) 80% MgAI20 ~ + 20% MgCr20~; II) 50% MgAI20 ~ + 50% MgCr204; III) 20% MgAI~O~ + 80% MgCr=O~, and carried out further studies on them. Our subsequent investigations were aimed at selecting the methods of activating the sintering process and establishing the technological parameters for obtaining high-density compacts and refractory products.…”

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confidence: 99%