Relevant bibliographies by topics / Fused-cast refractory

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  2. Dissertations / Theses
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Academic literature on the topic 'Fused-cast refractory'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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Journal articles on the topic "Fused-cast refractory"

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Wang, T.-j. "Modelling of fused cast alumina refractory." British Ceramic Transactions 98, no. 2 (February 1999): 62–70. http://dx.doi.org/10.1179/096797899680255.

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Sokolov, V. A., M. D. Gasparyan, and V. V. Kiryukhin. "Production Technology Features of Fused-Cast Baddeleyite-Corundum Refractory." Refractories and Industrial Ceramics 60, no. 6 (March 2020): 543–47. http://dx.doi.org/10.1007/s11148-020-00403-5.

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Sokolov, V. A., M. D. Gasparyan, M. B. Remizov, and P. V. Kozlov. "Selection of refractory materials for vitrification electric furnaces of radioactive waste." NOVYE OGNEUPORY (NEW REFRACTORIES), no. 11 (December 29, 2018): 53–56. http://dx.doi.org/10.17073/1683-4518-2018-11-53-56.

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It was shown that fused-cast chrome-containing refractories are the most promising as the lining material of designed glass-making electric furnaces and smallsized melters of the next generation. To provide a long (up to 10 years) life of the furnace, its elements that are subject to intensive wear must be made of refractories of HPL-85 type with a high chromium content. The bakor furnace masonry of other elements can be replaced with fused-cast refractory material type HAC-26M with a low content of chromium oxide.Ill.2. Ref. 11. Tab. 5.
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Galoisy, Laurence, Georges Calas, and Michel Maquet. "Alumina fused cast refractory aging monitored by nickel crystal chemistry." Journal of Materials Research 6, no. 11 (November 1991): 2434–41. http://dx.doi.org/10.1557/jmr.1991.2434.

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Aged bricks of AZS and mixed α-β-alumina refractories have been sampled in superstructures of glass making furnaces. α- and β-alumina phases contained in these refractories have been investigated by optical absorption spectroscopy, electron paramagnetic resonance, and electron probe microanalysis. On the side of the brick exposed to the tank atmosphere, β-alumina is the only phase present. The primary corundum grains are transformed into secondary β-alumina under the influence of contaminants from raw materials and oil ashes. The temperature conditions existing in the furnace preclude the formation of β” alumina. The bright blue color of β-alumina originates from the presence of tetrahedral Ni2+ in Al(2) sites, with no evidence for nickel atoms located in the ionic conduction band. By considering the chemical composition of β-alumina, spectroscopic results are consistent with a mutual interaction between divalent and monovalent species during cation diffusion. Indeed, the small divalent cations such as Ni are located in the spinel block and the larger alkali cations play a charge compensation role in the conduction band. As other divalent cations of small ionic radius, nickel hence helps to stabilize β-alumina, which maintains the refractory performance during furnace operation. The spectroscopic evidence of trace amounts of nickel (<100 ppm) in secondary corundum crystals means that this phase formed at the expense of β-alumina inside the high-alumina refractory brick. By considering the diffusion coefficients of Ni2+ in α- and β-alumina, this indicates a fast contamination of the material at an early stage of the furnace history. The formation of a permanent deep layer of primary and secondary corundum has protected the inner part of the refractory brick from further contamination.
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Yeugo Fogaing, Edwige, Marc Huger, and Christian Gault. "Elastic properties and microstructure: study of two fused cast refractory materials." Journal of the European Ceramic Society 27, no. 2-3 (January 2007): 1843–48. http://dx.doi.org/10.1016/j.jeurceramsoc.2006.04.149.

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Madi, Kamel, Sylvain Gailliègue, Michel Boussuge, Samuel Forest, Michel Gaubil, Elodie Boller, and Jean-Yves Buffière. "Multiscale creep characterization and modeling of a zirconia-rich fused-cast refractory." Philosophical Magazine 93, no. 20 (July 2013): 2701–28. http://dx.doi.org/10.1080/14786435.2013.785655.

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Yang, Dao Yuan, Min Xiao Ma, Ruo Yang Liu, Yue Chu, Yi Ming Yin, Luo Yuan Li, and Guan Hui Wan. "Riser Design of Cast System of Fused Zirconia-Alumina-Silica." Key Engineering Materials 633 (November 2014): 498–502. http://dx.doi.org/10.4028/www.scientific.net/kem.633.498.

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Fused cast Zirconia-Alumina-Silica material (AZS) is the key refractory to glass furnace. In order to reduce production cost and optimize production process, the influences of riser position and riser size on temperature gradient, solidification time, residual melt modulus, solidification fraction, and cooling rate of cast system were studied by the finite element simulation method according to the brick size of 600 mm × 400 mm × 300 mm. It turned out that it would be more efficient in feeding when riser located at the center of maximum surface of a brick or when the height of riser is 250 mm-270 mm, while the volume ratio of brick to riser is 2.95-2.74, on condition that the size of riser upper surface is 450 mm × 450 mm and the bottom 150 mm×150 mm.
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Wang, Run Feng, Ao Huang, Yan Zhu Huo, Li Jun Mei, Hong Jin Rao, and Bei Shi. "Physical Modeling and Simulation of the Cooling-Down of Fused-Cast Refractories." Materials Science Forum 996 (June 2020): 142–50. http://dx.doi.org/10.4028/www.scientific.net/msf.996.142.

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The accurate description of the interfacial heat transfer coefficient is of great significance for the accurate measurement of the temperature field in the process of casting cooling. In this paper, the solidification process of metallic tin in refractory mould was studied by physical simulation experiment, and the on-site temperature measurement of the mold structure was carried out. According to the temperature record, the numerical simulation method is used to realize the fitting of the calculated temperature and the measured temperature. The reversible method was used to calculate the interfacial heat transfer coefficient between the casting and the mould, and then the evolution of the internal temperature field of the casting during the cooling process was determined. The results show that the melt has a large shrinkage during the cooling process, and the interface heat transfer coefficient can reach 300 W·m-2·K-1, which provides a mathematical model for the annealing process of fused-cast refractories.
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Yuan, Fei, Dao Yuan Yang, Ting Wang, and Zhan Li. "Effects of Graphite Mold on Cooling Process of Fused AZS 33# Refractory." Key Engineering Materials 544 (March 2013): 110–14. http://dx.doi.org/10.4028/www.scientific.net/kem.544.110.

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This study analyzed effects of different thickness(TH) and thermal conductivity of graphite mold on temperature, liquid phase percentage and conductive heat flux, the cooling process of fused cast AZS 33# refractory could be simulated by using COMSOL Multiphysics software. The results show that: when the graphite mold thickness increased, surface center temperature and liquid phase area of casting decreased gradually, but conductive heat flux increased gradually, the cooling rate of casting increased, which were helpful to form fine crystals near the casting surface. When using conventional graphite mold, the optimum thickness was less than 40mm, while using the high thermal conductivity graphite mold, the optimum thickness was 50mm. So the rapid and homogeneous cooling process of casting could reduce the possibility of material crack and obtain fine crystals structure of material; comparing with conventional graphite mold, high thermal conductivity graphite mold was more beneficial to achieve uniform and fast cooling process to improve the performance and passing rate of products.
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Wisniewski, Wolfgang, Christian Thieme, and Christian Rüssel. "The detailed microstructure of an alumina-zirconia-silica (AZS) fused cast refractory material from the cast skin into the bulk analyzed using EBSD." Journal of the European Ceramic Society 39, no. 6 (June 2019): 2186–98. http://dx.doi.org/10.1016/j.jeurceramsoc.2019.01.051.

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Dissertations / Theses on the topic "Fused-cast refractory"

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Cockcroft, Steven Lee. "Thermal stress analysis of fused-cast Monofrax-S refractories." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30991.

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Mathematical models of heat flow and elastic stress generation based on the finite-element method have been developed and utilized to analyze the Epic-3 Monofrax-S casting process (Monofrax-S is primarily composed of 47-57% A1₂O₃, 34-41% ZrO₂ and 10-15% SiO₂). The results of the mathematical analysis, in conjunction with information obtained from a comprehensive industrial study, has led to the development of mechanisms for the formation of the various crack types found in this casting process. Thermal stresses have been predicted to be generated early in the solidification process in association with rapid cooling of the refractory surface as it contacts the initially cool mould and again later in the solidification process in conjunction with the tetragonal-to-monoclinic phase transformation which occurs in the zirconia component of Monofrax-S. The mathematical analysis has also helped to identify indirectly a potential mechanism for the generation of mechanical stresses. Based on an understanding of the generation of tensile stresses, recommendations have been made for modifications to the moulding and casting procedures in order to reduce the propensity for the formation of cracks. The modifications have included changes to the mould construction and geometry to reduce the generation of mechanical stresses and changes to the moulding materials to impact on the flow of heat at key times during solidification and cooling. With the recommendations in place, the casting process has been re-examined with the mathematical models to verify the impact of the modifications. The predictions show that the modifications have acted to reduce tensile stresses associated with the formation of Type-A and -B cracks. Preliminary industrial trials with the modified mould have yielded blocks free of these defects.
Applied Science, Faculty of
Materials Engineering, Department of
Graduate
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2

Zhang, Yang. "Etude des conséquences mécaniques de la transformation de phase dans les réfractaires électrofondus à très haute teneur en zircone." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEM035/document.

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Les réfractaires électrofondus, qui constituent l’objet de ce travail, appartiennent au système alumine-zircone-silice. Ils sont obtenus par coulée dans des moules à des températures supérieures à 2000°C, rendant très difficile toute instrumentation. De nombreux phénomènes intrinsèques au matériau interviennent lors du refroidissement qui suit la coulée. Parmi ces derniers, cette recherche a essentiellement porté sur la transformation de phase (de tétragonale à monoclinique) de la zircone et aux phénomènes associés (gonflement, plasticité,…).A partir d’essais mécaniques à haute température réalisés en laboratoire, les lois de comportements thermiques et mécaniques ont été caractérisées et modélisées en cours de transformation de la zircone. La plasticité à très bas seuil de contrainte observée a, en particulier, été décrite par une vitesse de déformation dérivée du modèle de Leblond, une fonction de rendement de type Cam-clay sans consolidation et une fonction de rendement définissant l’avancement de la transformation en fonction de la température. Après implémentation dans un code de calcul par éléments finis et validation par confrontation avec des résultats d’essais sous contraintes multiaxiales, ce modèle a été assemblé aux autres composantes du comportement mécanique (fluage, élasticité,…), pour décrire l’ensemble des phénomènes thermomécaniques observés lors du refroidissement.Parallèlement, des coulées de blocs en laboratoire, instrumentées par des thermocouples et des capteurs d’émission acoustique, ont permis de reconstruire par simulation numérique l’évolution du champ de température à l’intérieur de la dalle au cours du refroidissement. L’enthalpie de solidification et celle associée à la transformation de phase, préalablement quantifiée par ATD, ont été prises en compte. L’application du modèle mécanique complet, associant toutes les composantes du comportement, a permis de calculer l’évolution du champ de contraintes généré par les gradients thermiques en fonction du temps et, en particulier, de mettre en évidence le rôle essentiel joué par la transformation de phase sur la relaxation des contraintes
Fused-cast refractories, which are concerned by this work, belong to the alumina-zirconia-silica system. They are obtained by casting in molds at temperatures higher than 2000°C, that make very difficult any instrumentation. Many phenomena intrinsic to the material occur during cooling-down after casting. Among these latter, this research essentially focused on the phase transformation (from tetragonal to monoclinic) of zirconia and the associated phenomena (swelling, plasticity,...).From high temperature mechanical tests performed in laboratory, the thermal and mechanical behavior laws were characterized and modeled during the zirconia transformation. Plasticity at very low stress threshold was observed. A Leblond type model has been extended by introducing a Cam-clay yield function without consolidation. In this model, the progress of the transformation is controlled by the evolution of the temperature. This model was complemented by other components of the mechanical behavior (creep, elasticity, ...). It has been validated by experimental tests under multiaxial loadings that replicate the main thermomechanical phenomena observed during cooling.In parallel, blocks casted in laboratory conditions, instrumented with thermocouples and acoustic emission sensors, allowed a numerical simulation of the change in temperature field within the block during cooling-down. This simulation took into account the solidification enthalpy and the enthalpy associated to the phase transformation, previously quantified by DTA. The implementation of the complete mechanical model integrating all the behavior components led to a calculation of the stress field changes generated by thermal gradients as a function of time and, in particular, to highlight the essential role played by the phase transformation on stress relaxation
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Book chapters on the topic "Fused-cast refractory"

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Khemani, Deepak, Radhika B. Selvamani, Ananda Rabi Dhar, and S. M. Michael. "InfoFrax: CBR in Fused Cast Refractory Manufacture." In Lecture Notes in Computer Science, 560–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-46119-1_41.

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2

Bories, Olivier, Isabelle Cabodi, Michel Gaubil, and Bruno Malphettes. "New Fused Cast Refractory for Metal Line Protection." In 74th Conference on Glass Problems, 197–202. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118932964.ch19.

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Davis, R. Eugene, Gerard Duvierre, Yves Boussant-Roux, and Michael Nelson. "High-Zirconia Fused Cast Refractory Applications in CTV Panel Glass Melters." In A Collection of Papers Presented at the 61st Conference on Glass Problems: Ceramic Engineering and Science Proceedings, Volume 22, Issue 1, 117–23. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470294659.ch10.

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4

Myles, T. A., and F. Knee. "New High Chrome Fused Cast Refractory for Use in Contact with Highly Corrosive Glasses." In Ceramic Engineering and Science Proceedings, 269–76. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470320310.ch23.

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