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Thermal Shock Performance of Refractories for Application in Steel Ingot Casting
J. Fruhstorfer1, S. Schafföner1, J. Werner1, T. Wetzig1, L. Schöttler2, C.G. Aneziris1
1 Institute of Ceramic, Glass and Construction Materials, TU Bergakademie Freiberg, Agricolastraße 17, 09599 Freiberg, Germans
2 Deutsche Edelstahlwerke GmbH, Obere Kaiserstraße, 57078 Siegen, Germany
received January 25, 2016, received in revised form March 19, 2016, accepted April 6, 2016
Vol. 7, No. 2, Pages 173-182 DOI: 10.4416/JCST2016-00010
Abstract
This study investigates the thermal shock performance of carbon-free and low-carbon-containing refractories, with and without nanoscale additives, based on alumina, mullite, and alumina doped with zirconia and titania (AZT). For this purpose, the porosity and cold modulus of rupture of the refractories before and after a single thermal shock by compressed air were determined. The mullite-matrix materials exhibited the highest porosities owing to restrained densification during sintering, but exhibited the lowest strength losses of the carbon-free materials. In general, the carbon-containing materials had very low strengths because the carbon content was only 4 wt%. The matrix strength was therefore quite low. However, the additions of nanoadditives increased the strength of the carbon-containing alumina. Meanwhile, in the carbon-containing mullite, the nanoadditives caused an enhanced reaction of the used mullite raw material, while in the carbon-containing AZT, the nanoadditives resulted in enhanced decomposition of the aluminum titanate phase — leading to reduced strengths after thermal shock. Nevertheless, all alumina-based compositions as well as the carbon-free mullite-matrix materials seem very promising for application in steel ingot casting.
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Keywords
Thermal shock resistance, nanoadditives, mullite, alumina-titania-zirconia, fused raw material
References
1 Zhang, L., Thomas, B.G.: State of the art in the control of inclusions during steel ingot casting, Metall. Mater. Trans. B, 37B, 733 – 61, (2006).
2 Schönwelski, W., Ruwier, K., Foellbach, S., Sperber, J.: Refractory for ingot casting of high-quality steels, in german, stahl eisen, 134, [9], 58 – 62, (2014).
3 Rettore, R.d.P., Gueguen, E., Ritter, W.: High alumina refractory material with improved thermal shock resistance and hot properties for hollowware, The Refractories Engineer, November Issue, 19 – 22, (2012).
4 Ritter, W., Ruwier, K.G., Schönwelski, W.: Carbonaceous fireproof material for use when casting steel in a bottom casting process and formed parts produced thereof, Patent WO 2011/054872 A1, (2011).
5 Zhang, L., Thomas, B.G.: Inclusions in continuous casting of steel, In: XXIV National Steelmaking Symposium, Morelia, Mich, Mexico, 2003.
6 Fruhstorfer, J., Schöttler, L., Dudczig, S., Schmidt, G., Gehre, P., Aneziris, C.G.: Erosion and corrosion of alumina refractory by ingot casting steels, J. Eur. Ceram. Soc., 36, 1299 – 306, (2016).
7 Ellingham, H.J.T.: Reducibility of oxides and sulphides in metallurgical processes, J. Soc. Chem. Ind. (J. Chem. Technol. Biotechnol.), X, 125 – 33, (1944).
8 Fruhstorfer, J., Barlag, S., Thalheim, M., Schöttler, L., Aneziris, C.G.: Upright die pressing of refractory hollowware for steel ingot casting with reduced clay content, Ceram. Int., 42, 3219 – 28, (2016).
9 Andreasen, A.: On the relation between grading and interstices in products of loose grains, in german, Colloid Polym. Sci., 50, 217 – 28, (1930).
10 Fruhstorfer, J., Aneziris, C.G.: The influence of the coarse fraction on the porosity of refractory castables, J. Ceram. Sci. Tech., 5, [2], 155 – 66, (2014).
11 Aneziris, C.G., Dudczig, S., Gerlach, N., Berek, H., Veres, D.: Thermal shock performance of fine-grained Al2O3 ceramics with TiO2 and ZrO2 additions for refractory applications, Adv. Eng. Mater., 12, [6], 478 – 85, (2010).
12 Dudczig, S., Veres, D., Aneziris, C.G., Skiera, E., Steinbrech, R.W.: Nano- and micrometer additions of SiO2, ZrO2 and TiO2 in fine-grained alumina refractory ceramics for improved thermal shock performance, Ceram. Int., 38, [3], 2011 – 9, (2012).
13 Fruhstorfer, J., Möhmel, S., Thalheim, M., Schmidt, G., Aneziris, C.G.: Microstructure and strength of fused high alumina materials with 2.5 wt% zirconia and 2.5 wt% titania additions for refractory applications, Ceram. Int., 41, 10644 – 53, (2015).
14 Cooper, C.F., Alexander, I.C., Hampson, C.J.: The role of graphite in the thermal shock resistance of refractories, Br. Ceram. Trans., 84, [2], 57 – 62, (1985).
15 Lee, W.E., Zhang, S.: Melt corrosion of oxide and oxide-carbon refractories, Int. Mater. Rev., 44, [3], 77 – 104, (1999).
16 Skiera, E., Malzbender, J., Mönch, J., Dudczig, S., Aneziris, C.G., Steinbrech, R.W.: Controlled crack propagation experiments with a novel alumina-based refractory, Adv. Eng. Mater., 14, [4], 248 – 54, (2011).
17 Roungos, V., Aneziris, C.G., Berek, H.: Novel Al2O3-C refractories with less residual carbon due to nanoscaled additives for continuous steel casting applications, Adv. Eng. Mater., 14, [4], 255 – 64, (2012).
18 Roungos, V., Aneziris, C.G.: Improved thermal shock performance of Al2O3-C refractories due to nanoscaled additives, Ceram. Int., 38, [2], 919 – 27, (2012).
19 Fruhstorfer, J., Dudczig, S., Gehre, P., Schmidt, G., Brachhold, N., Schöttler, L., Aneziris, C.G.: Corrosion of carbon free and bonded refractories for application in steel ingot casting, Steel Res. Int., Manuscript accepted on March 17, (2016)
20 Lee, W.E., Zhang, S., Karakus, M.: Refractories: controlled microstructure composites for extreme environments, J. Mater. Sci., 39, 6675 – 85, (2004).
21 Say, M.G.: 1 - Units, Mathematics and Physical Quantities. In: Laughton, M.A., Say, M.G.: Electrical Engineer's Reference Book, 14th edition. Butterworth-Heinemann, Oxford, 1985.
22 Gibson, L.J.: Mechanical behavior of metallic foams, Annu. Rev. Mater. Sci., 30, 191 – 227, (2000).
23 Saharan, V. A., Kukkar, V., Kataria, M., Kharb, V., Choudhury, P.K.: Ordered mixing: mechanism, process and applications in pharmaceutical formulations, Asian J. Pharm. Sci., 3, [6], 240 – 59, (2008).
24 Mertke, A., Aneziris, C.G.: The influence of nanoparticles and functional metallic additions on the thermal shock resistance of carbon bonded alumina refractories, Ceram. Int., 41, 1541 – 52, (2015).
25 McKee, W.D. Jr., Aleshin, E.: Aluminum oxide-titanium oxide solid solution, J. Am. Ceram. Soc., 46, [1], 54 – 8, (1963).
26 Aksay, I.A., Dabbs, D.M., Sarikaya, M.: Mullite for structural, electronic and optical applications, J. Am. Ceram. Soc., 74, [10], 2343 – 58, (1991).
27 Rodrigo, P.D.D., Boch, P.: High purity mullite ceramics by reaction sintering, Int. J. High Tech. Ceram., 1, 3 – 30, (1985).
28 Salmang, H., Scholze, H.: Ceramic, in German,. 7th, completely revised and extended edition. Springer Berlin Heidelberg New York, 2007.
29 Coble, R.L., Kingery, W.D.: Effect of porosity on physical properties of sintered alumina, J. Am. Ceram. Soc., 39, [11], 377 – 85, (1956).
30 Ulbricht, J., Dudczig, S., Tomsu, F., Palco, S.: Technological measures to improve the thermal shock resistance of refractory materials, Interceram, 2, 103 – 6, (2012).
31 Naghizadeh, R., Rezaie, H.R., Golestani-Fard, F.: The influence of composition, cooling rate and atmosphere on the synthesis and thermal stability of aluminum titanate, Mater. Sci. Eng. B, 157, 20 – 5, (2009).
32 Werner, J., Aneziris, C.G., Dudczig, S.: Young's modulus of elasticity of carbon-bonded alumina materials up to 1450 °C, J. Am. Ceram. Soc., 96, [9], 2958 – 65, (2013).
33 Larson, D.R., Coppola, J.A., Hasselman, D.P.H., Bradt, R.C.: Fracture toughness and spalling behavior of high-Al2O3 refractories, J. Am. Ceram. Soc., 57, [10], 417 – 21, (1974).
34 Risbud, S.H., Pask, J.A.: SiO2-Al2O3 metastable phase equilibrium diagram without mullite, J. Mater. Sci., 13, 2449 – 54, (1978).
35 Schulle, W.: Refractory materials, in German. 1st edition. Dt. Verlag für Grundstoffind. Leipzig, 1990.
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