Influence of sand base preparation on properties of chromite moulding sands with sodium silicate hardened with selected methods

Open access

Abstract

The paper presents a research on the relation between thermal preparation of chromite sand base of moulding sands containing sodium silicate, hardened with selected physical and chemical methods, and structure of the created bonding bridges. Test specimens were prepared of chromite sand - fresh or baked at 950°C for 10 or 24 hours - mixed with 0.5 wt.% of the selected non-modified inorganic binder and, after forming, were hardened with CO2 or liquid esters, dried traditionally or heated with microwaves at 2.45 GHz. It was shown on the grounds of SEM observations that the time of baking the base sand and the hardening method significantly affect structure of the bonding bridges and are correlated with mechanical properties of the moulding sands. It was found that hardening chromite-based moulding mixtures with physical methods is much more favourable than hardening with chemical methods, guaranteeing also more than ten times higher mechanical properties.

[1] J.L. Lewandowski, Materials for foundry moulds, 1997 Akapit, Kraków.

[2] E. Janicki, W. Sakwa, Moulding materials-properties and application, 1965 Wydawnictwo Naukowo-Techniczne, Warszawa.

[3] W. Sakwa, T. Wachelko, Materials for foundry moulds and cores, 1981 Śląsk, Katowice.

[4] H. Ważny, D. Substyk, Kwartalnik Geologiczny 19 (4), 805-812 (1975).

[5] Polish Norm PN-91/H-11007. Chromite sand.

[6] J. Jakubski, St.M. Dobosz, Archives Of Foundry 6 (18), 453-458 (2006).

[7] S. Bengulur, H.R. Darwada, K.R. Gurram, P.R. Vundavilli, Recent Advances in Robotics, Aeronautical and Mechanical Engineering, ISBN: 978-1-61804-185-2

[8] A. Modrzyński, Solidification of Metals and Alloys 2 (43), 375-382 (2000).

[9] M. Hajkowski, Archives of Foundry 4 (14), 154-162 (2004).

[10] P. Jelínek, T. Elbel, Archives of Foundry Engineering 10 (4), 77-82 (2010).

[11] St.M. Dobosz, P. Jelinek; K. Major-Gabrys, China Foundry 8 (4), 438-446 (2011).

[12] A. Bobrowski, M. Holtzer, Arch. of Foundry Eng. 10 (spec. iss. 2), 19-22 (2010).

[13] Z. Ignaszak, J-B. Prunier, Archives of Foundry Engineering 16 (3), 162-166 (2016).

[14] R. Dańko, M. Holtzer, J. Dańko, Arch. Metall. Mater. 60 (1), 313-318 (2015).

[15] M. Stachowicz, K. Granat, A. Małachowska, Arch. of Foundry Eng. 14 (spec. iss. 2), 83-88 (2014).

[16] M. Stachowicz, M. Kamiński, K. Granat, Ł. Pałyga, Arch. of Foundry Eng. 16 (4), 147-152 (2016).

[17] M. Stachowicz, J. Mażulis, K. Granat, A. Janus, Metalurgija 53 (3), 317-319 (2014).

[18] K. Wiśniewska, J. Szczerba, Materiały Ceramiczne /Ceramic Materials/ 66 (3), 341-344 (2014).

[19] Y. Murakami, A. Sawata, Y. Tsuru, J. Mater. Sci. 34, 951-955 (1999).

[20] A. Baliński, About the structure of the hydrated sodium silicate as a molding sands binder, (2009) Foundry Research Institute, Kraków.

Archives of Metallurgy and Materials

The Journal of Institute of Metallurgy and Materials Science and Commitee on Metallurgy of Polish Academy of Sciences

Journal Information


IMPACT FACTOR 2016: 0.571
5-year IMPACT FACTOR: 0.776

CiteScore 2016: 0.85

SCImago Journal Rank (SJR) 2016: 0.347
Source Normalized Impact per Paper (SNIP) 2016: 0.740

Metrics

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 54 54 13
PDF Downloads 21 21 7