Influence of melt temperature on strength parameters of cyclically activated used-up sandmixes containing water-glass, hardened with microwaves

• Autorzy: Stachowicz M. , Granat K.

Identyfikatory

DOI

10.1016/j.acme.2015.06.003

• Języki publikacji: EN

Abstrakty

EN

The paper presents results of a research on a possibility to apply the innovative, combined with activation of the binder, reclamation process of microwave-hardened moulding sands containing water-glass. The sandmix to be examined, prepared of high-silica sand and the selected water-glass grade 145, was subject to the following cyclical processing stages: mixing the components, compacting, microwave hardening, cooling-down, thermal loading the mould to 800 or 1200 °C, cooling-down to ambient temperature, knocking-out, mechanical dry and wet reclamation, refreshing. After each subsequent cycle of processing the sandmix, used and overheated to various degrees, determined was tensile and bending strength. Analysis of the obtained results indicates that it is possible to activate regenerate of used sandmix containing water-glass, hardened by microwave heating. However, effectiveness of activation in subsequent life cycles of the sandmix is significantly affected by temperature of the casting alloy poured to the mould.

Słowa kluczowe

EN

moulding sand; water glass; microwave heating; hardening; reclamation

PL

ogrzewanie mikrofalowe; regeneracja; utwardzenie

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2015
• Tom: Vol. 15, no. 4
• Strony: 831--835
• Opis fizyczny: Bibliogr. 15 poz., tab., wykr.

Twórcy

autor

Stachowicz M.

• Wroclaw University of Technology, Mechanical Engineering, Lukasiewicza 25, Wroclaw, Poland

autor

Granat K.

• Wroclaw University of Technology, Mechanical Engineering, Lukasiewicza 25, Wroclaw, Poland

Bibliografia

• [1] J. Dańko, R. Dańko, M. Łucarz, Processes and Equipment for Reclamation of Matrix of Waste Molding Sands, Scientific Publishing House Akapit, Kraków, 2007 (in Polish).
• [2] S.M. Dobosz, P. Jelinek, K. Major-Gabryś, Development tendencies of moulding and core sands, China Foundry 8 (4) (2011) 438–446.
• [3] J.L. Lewandowski, Materials for Moulds, Research. Part II, Publishing of AGH, Kraków, 1992 (in Polish).
• [4] M. Stachowicz, K. Granat, D. Nowak, Dielectric hardening method of sandmixes containing hydrated sodium silicate, Metalurgija 52 (2) (2013) 169–172.
• [5] W. Jina, F. Zitian, Z. Xiaolei, Properties of sodium silicate sand hardened by microwave heating, China Foundry 3 (2009) 191– 196.
• [6] L. Fuchu, F. Zitian, L. Xinwang, W. Huafang, H. Jiaqing, Research on humidity resistance of sodium silicate sand hardened by twice microwave heating process, Materials and Manufacturing Processes 29 (2014) 184–187.
• [7] 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 11 (1) (2011) 209–219.
• [8] M. Stachowicz, K. Granat, Possibilities of reclamation microwave-hardened molding sands with water glass, Archives of Metallurgy and Materials 59 (2) (2014) 757–760.
• [9] M. Stachowicz, K. Granat, Research on reclamation and activation of moulding sands containing water-glass hardened with microwaves, Archives of Foundry Engineering 14 (2) (2014) 105–110.
• [10] P. Jelinek, The development of inorganic binders for dehydratation microwave curing, in: VIII Foundry Conference Technical 2005, Nowa Sól, 12–13, May, 2005, 2005 5–13 (in Polish).
• [11] J. Zych, Effecting of the weather conditions on the surface layer condition of moulds made with moulding sand whit the chemical bonding, Archiwum Odlewnictwa 22 (6) (2006) 576– 581 (in Polish).
• [12] W. Huafang, G. Wenbang, L. Jijun, Improve the humidity resistance of sodium silicate sands by ester-microwave composite hardening, Metalurgija 53 (4) (2014) 455–458.
• [13] B. Grabowska, M. Holtzer, R. Dańko, M. Górny, A. Bobrowski, E. Olejnik, New BioCo binders containing biopolymers for foundry industry, Metalurgija 52 (1) (2013) 47–50.
• [14] K. Major-Gabryś, Biodegradable materials as foundry moulding sands binders, Metalurgija 54 (3) (2015) 591–593.
• [15] B. Grabowska, M. Sitarz, E. Olejnik, K. Kaczmarska, FT-IR and FT-Raman studies of cross-linking processes with Ca2+ ions, glutaraldehyde and microwave radiation for polymer composition of poly(acrylic acid)/sodium salt of carboxymethyl starch, Pt. 1, Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 135 (2015) 529–535.