Influence of water-glass grade and quantity on residual strength of microwave-hardened moulding sands. Part 2

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

Abstrakty

EN

The paper continues dealing with the issues of influence of microwave hardening on mechanical properties of waterglass-based moulding sands. This second part of the research includes examining moulding sands containing 1.5, 2.5 and 3.5% of hydrated sodium silicate grade 150. Standardised, microwave-hardened cylindrical specimens for mechanical testing were held at temperatures from 100 to 1200 oC for 30 minutes, cooled-down to ambient temperature and then their residual strength was determined. An attempt was made to explain the effect of microwave hardening on strength of moulding sands as a function of baking temperature, supported by SEM observations of the baked sandmixes. On the grounds of these observations, destruction nature of linking bridges was identified. It was found that the applied microwave hardening is beneficial by reducing residual strength of waterglass-containing moulding sands and thus improving their knockout properties.

Słowa kluczowe

EN

moulding sand; microwave hardening; hydrated sodium silicate; water glass; residual strength; knock-out properties

PL

piasek formierski; mikrofale; uwodniony krzemian sodu; szkło wodne; wytrzymałość resztkowa; wybijalność masy formierskiej

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2011
• Tom: Vol. 11, iss. 2
• Strony: 143--148
• Opis fizyczny: Bibliogr. 13 poz., rys., wykr.

Twórcy

autor

Stachowicz M.

autor

Granat K.

autor

Nowak D.

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

Bibliografia

• [1] 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, iss. 1, s. 93-98.
• [2] A. Baliński, Residual strength of molding a hydrated sodium silicate curing ethylene glycol diacetate in the light of the phase transition temperature and the resulting silica gel, Archiwum Technologii Maszyn i Automatyzacji, vol 22, nr 1, 2002 (in Polish).
• [3] I. Izdebska-Szanda, The study of correlation between the type and amount of modifier and high-temperature transformation sand residual strength of the masses with the modified sodium silicate, Prace Instytutu Odlewnictwa, Tom XLVIII, Zeszyt 1, 2008 (in Polish).
• [4] W. Sakwa, T. Wachelko, Materials for casting molds and cores, Wydawnictwo "Śląsk", Katowice 1981 (in Polish).
• [5] H. Polzin, E. Fleming, Untersuchungen zur Mikrowellenverfestigung von wasserglasgebundenen Giessereiformstoffen Teil 1: Versuchsergebnisse zu erreichbaren technologischen Eigenschaften und praktische Erprobung, Giesserei-Praxis 12/1999.
• [6] 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, nr 4, t. 1, 2007.
• [7] K. Granat, D. Nowak, M. Pigiel, M. Stachowicz, R. Wikiera, The influence of water glass on the properties of microwave cured molding sands, Archives of Foundry Engineering, 2008, vol. 8, spec. iss. 1.
• [8] 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. iss. 2.
• [9] J. Dańko, R. Dańko, M. Łucarz, Procesy i urządzenia do regeneracji osnowy zużytych mas formierskich, Wydawnictwo Naukowe AKAPIT, Kraków 2007.
• [10] M. Stachowicz, K. Granat, D. Nowak, Effect of hardening method and structure of linking bridges on strength of water glass moulding sands, Archives of Foundry Engineering, 2010, vol. 10, spec. iss. 2, s. 141-146.
• [11] M. Stachowicz, K. Granat, D. Nowak, K. Haimann, Effect of hardening methods of moulding sands with water glass on structure of bonding bridges, Archives of Foundry Engineering, 2010, vol. 10, iss. 3, s. 123-128.
• [12] 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.
• [13] M. Stachowicz, K. Granat, D. Nowak, Application of microwaves for innovative hardening of environment-friendly water-glass moulding sands used in manufacture of cast-steel castings, Archives of Civil and Mechanical Engineering, 2011, vol. 11, no.1, s 209-219.