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Open access

M. Łucarz and D. Drożyński

Abstract

The results of investigations concerning the influence of the applied sand matrix (fresh sand, reclaim) on the properties of moulding sands used for production of large dimensional castings (ingot moulds, ladles), are presented in the hereby paper. The performed investigations were aimed at determining the influence of various reclamation methods of spent moulding sands on the quality of the obtained reclaimed material. Moulding sands were prepared on the fresh quartz matrix as well as on sand matrices obtained after various reclamation methods. The selected moulding sand parameters were tested (strength, permeability, grindability, ignition losses, pH reactions). It can be stated, on the basis of the performed investigations, that the kind of the applied moulding sand matrix is of an essential meaning from the point of view of creating conditions minimising formation of large amounts of gases and their directional migration in a casting mould.

Open access

A. Sorek and Z. Kudliński

The Influence of the Near-Meniscus Zone in Continuous Casting Mold on the Surface Quality of the Continuous Casting Ingots

The physical, chemical and mechanical phenomena which take place in the near-meniscus zone of continuous casting mold are the significant factors influencing the quality of CC ingot and especially the quality of its surface. Such phenomena consist of the following processes: lubrication of the ingot surface by the liquid slag-forming phase of mold powder, creation of meniscus, formation of the specific kind of galvanic cell and connected with this cell ions migration of liquid mold powder. Application of the mold powders is the commonly used lubrication method of the surface of CC ingots in mold (in near-meniscus zone). According to the ionic structure theory of the liquid metallurgical slags the following thesis can be formulated: the liquid slag-forming phase of mold powder is the ionic liquid. The ionic liquid occurs between two metals: the copper wall of mold and the steel surface of ingot can create a specific kind of galvanic cell in the upper part of mold (the near-meniscus zone of mold). The paper presents results of industrial research of low-carbon steel continuous casting. The electromotive force of galvanic cell situated in the upper (near-meniscus) part of CC mold was measured. Moreover, the influence of applied powders with different alkalinity on the character of oscillatory marks forming on the ingot surface was considered. The galvanic cell, which is created in the upper part of mold in the near-meniscus zone, can cause the essential change of the chemical composition of electrolyte (liquid phase of mold powder) in the near-electrodes zones. So in the process the condition of lubrication and character of obtained oscillatory mark can also be changed.

Open access

J. Kowalski, J. Pstruś, S. Pawlak, M. Kostrzewa, R. Martynowski and W. Wołczyński

Ingots, Inżynieria Materiałowa 175 , 260-263 (2010). P. Hoekstra, R. D. Miller, On the Mobility of Water Molecules in the Transition Layer between Ice and a Solid Surface, Journal of Colloid Interface Science 25 , 166-173 (1967). R. R. Gilpin, Model for the "Liquid-Like" Layer between Ice and a Substrate with Applications to Wire Regulation and Particle Migration, Journal of Colloid Interface Science 68 , 235-251 (1979). J. K. Kim, P. K. Rohatgi, An Analytical Solution of the Critical

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Z. Ranachowski, D. Józwiak-Niedzwiedzka, P. Ranachowski, F. Rejmund, M. Dabrowski, S. Kudela and T. Dvorak

resistance to migration of chlorides, Brittle Matrix Composites BMC-10, 367-376 (2012). [16] PN-EN 13295: 2005, Products and systems for the protection and repair of concrete structures. Test methods. Determination of resistance to carbonation. [17] D. Józwiak - Niedzwiedzka, A.M. Brandt, K. Gibas, P. Denis, The alkali-aggregate reaction hazard in the case of barite concretes, Cement, Lime, Concrete 19, 4, 234-242 (2014).

Open access

M. Matsunami, T. Hashizume and A. Saiki

REFERENCES [1] Weixin Song, Xiaobo Ji, Zhengping Wu, Yingchang Yang, Zhou Zhou, Fangqian Li, Qiyuan Chen, Craig E. Banks, Exploration of ion migration mechanism and diffusion capability for Na 3 V 2 (PO 4 ) 2 F 3 cathode utilized in rechargeable sodium-ion batteries, Journal of Power Sources 256 , 258-263 (2014). [2] J.W. Liu, G. Chen, Z.H. Li, Z.G. Zhang, Hydrothermal synthesis and photocatalytic properties of ATaO 3 and ANbO 3 (A=Na and K), Journal of Power Sources 32 , 2269-2272 (2007). [3] Donghan Kim, Eungje Lee, Michael Slater

Open access

P. Borkowski and A. Sienicki

. Walczuk, P. Borkowski, K. Frydman, D. Wojcik-Grzybek, W. Bucholc, M. Hasegawa, Migration of composite contact materials components at high current arcing. IEICE Transactions on Electronics E90-C , 7, 1377-1384 (2007). [28] P. Borkowski, E. Walczuk, Influence of contact diameter no arc erosion of the polarized contacts at high current conditions. Proc. 10 th International Conference SAP, Lodz, 111-115 (2005). [29] P. Borkowski, D. Boczkowski, Computer-aided testing of contacts on switching high current. Archives of Electrical Engeneering, PAN in Warsaw 54

Open access

S. Razavi-Tousi, R. Yazdani-Rad and S. Manafi

References R. Dannenberg, E. A. Stach, J. R. Groza, B. J. Dresser, In-situ TEM observations of abnormal grain growth, coarsening, and substrate de-wetting in nanocrystalline Ag thin films, Thin Solid Films 370 , 54-62 (2000). A. Afshar, A. Simchi, Abnormal grain growth in alumina dispersion-strengthened copper produced by an internal oxidation process, Scripta Materialia 58 , 966-969 (2008). G. D. Hibbard, V. Radmilovic, K. T. Aust, U. Erb, Grain boundary migration during abnormal

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Z. Huda, T. Zaharinie, H.S.C. Metselaar, S. Ibrahim and Goh J. Min

behavior, Mater. Sci. Eng. A 437 , 157-171 (2006). [19] R.E. Hummel, Understanding Materials Science: History, Properties, Applications. Springer, USA (2004). [20] C. Suryanarayana, Mechanical Alloying and Milling, CRC Press, USA (2004). [21] Z. Hudaand T. Zaharinie, Kinetics of Grain Growth in2024-T3: an Aerospace Aluminum Alloy, J. Alloysand Compounds 478 , 128-132 (2009). [22] B. Ralph, K.B. Shim, Z. Huda, J. Furley, M. Edirisinghe, Effect of Particles and Solutes on Grain-Boundary Migration and Grain Growth, Materials Science Forum 94-96 , 129-140 (1992

Open access

P. Zięba

boundaries, Defect Diffus. Forum 249 , 173-182 (2006). [12] L.M. Klinger, Y.J.M. Brechet, G.R. Purdy, Kinetics of multilayer homogenization via coupled grain boundary diffusion and migration: discontinuous homogenization, Acta Mater. 45 , 4667-4674 (1997). [13] Y. Brechet, Ch. Hutchinson, Defect-induced dynamic pattern formation in metals and alloys, in: H. Ehrenreich and F. Spaepen (Eds.), Solid State Physics 2006, 60 , 181-286, Elsevier Inc. (USA) 2006. [14] H.I. Aaronson, M. Enomoto, J. K. Lee, Cellular reactions, in: Mechanisms of diffusional phase