Effect of hardening methods of moulding sands with water glass on structure of bonding bridges

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

Abstrakty

EN

Research on influence of hardening methods on structure of bonding bridges in moulding sands with sodium water glass is presented. Moulding sands with addition of 2.5 % of binder with molar module 2.0 were hardened with CO₂ and dried in traditional way or hardened with microwaves. It was proved that the hardening method affects structure of bonding bridges, correlating with properties of the hardened moulding sands. It was found that strength of the moulding sands hardened with microwaves for 4 min is very close to that measured after traditional drying at 110 °C for 120 min. So, application of microwave hardening ensures significant shortening of the process time to the value comparable with CO₂ hardening but guaranteeing over 10-fold increase of mechanical properties. Analysis of SEM images of hardened moulding sands permitted explaining differences in quality parameters of moulding sands by connecting them with structure of the created bonding bridges.

Słowa kluczowe

EN

innovative foundry technologies; water glass; moulding sand; microwaves; CO2 process; hardening

PL

nowoczesne technologie odlewnicze; szkło wodne; masa formierska; mikrofale; proces CO2; utwardzanie

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2010
• Tom: Vol. 10, iss. 3
• Strony: 123--128
• Opis fizyczny: Bibliogr. 6 poz., fot., rys., tab.

Twórcy

autor

Stachowicz M.

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

autor

Granat K.

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

autor

Nowak D.

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

autor

Haimann K.

• Wroclaw University of Technology, Materials Science Team, ul. Smoluchowskiego 25, 50-370 Wrocław, Polska

Bibliografia

• [1] J. L. Lewandowski, Materials for casting moulds, Akapit, Krakow, 1997 (in Polish).
• [2] M. Pigiel, K. Granat, D. Nowak, W. Florczak, Application of microwave energy in foundry processes, Archives of Foundry Engineering, No. 21, 2006, chapter 6 (in Polish).
• [3] 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, No. 4, vol. 1, 2007.
• [4] K. Granat, D. Nowak, M. Pigiel, M. Stachowicz, R. Wikiera, The influence of microwave heating and water glass kind on the properties of molding sands, Archives of Foundry Engineering, 2008, Vol. 8, spec. iss. 1.
• [5] R. Chudzikiewicz, Casting in self-hardening moulds, WNT, Warsaw, 1971 (in Polish).
• [6] B. Hutera, J. L. Lewandowski, D. Drożyński, Importance of binder viscosity and wettability of quartz for strength of sandmix, Foundry Review, vol. 7-8, 2004 (in Polish).