Effect of bentonite addition on residual strength of microwave-hardened waterglass-containing moulding sands

• Autorzy: Stachowicz M. , Granat K. , Nowak D.
• Języki publikacji: EN

Abstrakty

EN

The paper presents results of a preliminary research of the effect of bentonite addition on residual strength of microwave-hardened moulding sands, containing sodium waterglass. Strength was determined at ambient temperature, on cylindrical specimens baked in an oven. Moulding sands for examinations were based on high-silica sand with addition of 2.5 % of non-modified, domestic-made waterglass grade 145. The prepared standard cylindrical specimens were hardened using the innovative microwave heating process and next baked for 30 minutes at temp eratures between 100 and 1200 °C. Strength parameters of the specimens were determined on the specimens cooled-down to ambient temperature. The obtained results were compared with literature data to evaluate the effect of the applied hardening method and of the special additive on residual strength as a function of baking temperature. A favourable effect was found of both the innovative heating process and the applied bentonite addition.

Słowa kluczowe

EN

moulding sand; sodium waterglass; bentonite; residual strength; microwave hardening

PL

masa formierska; szkło wodne sodowe; bentonit; wytrzymałość końcowa; hartowanie mikrofalowe

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2011
• Tom: Vol. 11, iss. 3 spec.
• Strony: 199--204
• Opis fizyczny: Bibliogr. 9 poz., rys., tab., wykr.

Twórcy

autor

Stachowicz M.

• Foundry and Automation Group, Wroclaw University of Technology, ul. Łukasiewicza 5, 50-371 Wrocław, Poland

autor

Granat K.

• Foundry and Automation Group, Wroclaw University of Technology, ul. Łukasiewicza 5, 50-371 Wrocław, Poland

autor

Nowak D.

• Foundry and Automation Group, Wroclaw University of Technology, ul. Łukasiewicza 5, 50-371 Wrocław, Poland

Bibliografia

• [1] M. Pigiel, Waterglass-based moulding sands hardened using microwaves, Archives of Mechanical Technology and Automation, vol. 18, Wrocław 1998, pp. 249-254 (in Polish).
• [2] H. Polzin, E. Fleming, Untersuchungen zur Mikrowellenverfestigung von wasserglasgebundenen Giessereiformstoffen Teil 1: Versuchsergebnisse zu erreichbaren technologischen Eigenschaften und praktische Erprobung, Giesserei–Praxis 12/1999, pp. 569-581.
• [3] P. Jelinek, H. Polzin, R. Skuta, Utilization of physical dehydration for hardening of cores bonded with colloidal solutions of alkaline silicates, Acta Metallurgica Slovaca, 10, 2004, 1, pp.10-23.
• [4] K. Granat, D. Nowak, M. Pigiel, M. Stachowicz, R. Wikiera, The influence of hardening method on basic properties of water glass molding sands, Visnik Chmel'nickogo Nacional'nogo Universitetu, 2007, No. 4, vol. 1.
• [5] M. Stachowicz, K. Granat, D. Nowak, Studies on the possibility of more effective use of water glass thanks to application of selected methods of hardening, Archives of Foundry Engineering, 2010, vol. 10, spec. issue 2, pp. 135-140.
• [6] M. Stachowicz, K. Granat, D. Nowak, Influence of water-glass grade and quantity on residual strength of microwave-hardened moulding sands. Part 1, Archives of Foundry Engineering, 2011, vol. 11, issue 1, pp. 93-98.
• [7] J. L. Lewandowski, Materials for casting moulds, Akapit, Kraków, 1997 (in Polish).
• [8] M. Stachowicz, K. Granat, D. Nowak, Influence of water-glass grade and quantity on residual strength of microwave-hardened moulding sands. Part 2, Archives of Foundry Engineering, 2011, vol. 11, issue 2, pp. 143-148.
• [9] M. D. Allendorf, K. E. Spear, Thermodynamic Analysis of Silica Refractory Corrosion in Glass-Melting Furnaces, Journal of The Electrochemical Society, 2001, 148 (2), B59-B67.