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Abstract

The sodium silicate sands hardened by microwave have the advantages of high strength, fast hardening speed and low residual strength with the lower addition of sodium silicate. However, the sodium ion in the sands will absorb moisture from the atmosphere, which would lead to lower storing strength, so the protection of a bonding bridge of sodium silicate between the sands is crucial. Methyl silicone oil is a cheap hydrophobic industrial raw material. The influence of the addition amount of methyl silicone oil modifier on compressive strength and moisture absorption of sodium silicate sands was studied in this work. The microscopic analysis of modified before and after sodium silicate sands has been carried on employing scanning electron microscopy(SEM) and energy spectrum analysis(EDS). The results showed that the strength of modified sodium silicate sands was significantly higher than that of unmodified sodium silicate sands, and the best addition of methyl silicone oil in the quantity of sodium silicate was 15%. It was also found that the bonding bridge of modified sodium silicate sands was the density and the adhesive film was smooth, and the methyl silicone oil was completely covered on the surface of the sodium silicate bonding bridge to protect it.
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Bibliography

[1] Stachowicz, M., Pałyga, Ł. & Kȩpowicz, D. (2020). Influence of automatic core shooting parameters in hot-box technology on the strength of sodium silicate olivine moulding sands. Archives of Foundry Engineering. 20(1), 67-72.
[2] Nowak, D.(2017).The impact of microwave penetration depth on the process of hardening the moulding sand with sodium silicate. Archives of Foundry Engineering. 17(4), 115-118.
[3] Gal, B., Granat, K. & Nowak, D. (2017). Effect of compaction degree on permittivity of water-glass containing moulding sand. Metalurgija. 56(1), 17-20.
[4] Kaźnica, N. & Zych, J. (2019). Indicator wso: a new parameter for characterization of protective coating efficiency against humidity. Journal of Materials Engineering and Performance. 28(7), 3960-3965.
[5] Bae, M.A., Lee, M.S. & Baek, J.H. (2020). The effect of the surface energy of water glass on the fluidity of sand. Journal of Korean Institute of Metals and Materials. 58(5), 319-325.
[6] Peng, Q.S., Wang, P.C., Huang, W., & Chen, H.B. (2020). The irradiation-induced grafting of nano-silica with methyl silicone oil. Polymer. 192(4), 122315.
[7] Stachowicz, M., Granat, K., & Payga. (2017). Influence of sand base preparation on properties of chromite moulding sands with sodium silicate hardened with selected methods. Archives of Metallurgy and Materials. 62(1), 379-383.
[8] Zhu, C. (2007). Recent advances in waterglass sand technologies. China Foundry. 4(1), 13-17.
[9] Huafang, W., Wenbang, G. & Jijun, L. (2014). Improve the humidity resistance of sodium silicate sands by ester-microwave composite hardening. Metalurgija. 53(4), 455-458.
[10] Masuda, Y., Tsubota, K., Ishii, K., Imakoma, H. & Ohmura, N. (2009). Drying rate and surface temperature in solidification of glass particle layer with inorganic binder by microwave drying. KAGAKU KOGAKU RONBUNSHU. 35(2), 229-231.
[11] Kosuge, K., Sunaga, M., Goda, R., Onodera, H. & Okane, T. (2018). Cure and collapse mechanism of inorganic mold using spherical artificial sand and water glass binder. Materials transactions. 59(11), 1784-1790.
[12] Zhang, Y.H., Liu, Z.Y., Liu, Z.C. & Yao, L.P. (2020). Mechanical properties of high-ductility cementitious composites with methyl silicone oil. Magazine of Concrete Research. 72(14), 747-756.
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Authors and Affiliations

Huafang Wang
1
ORCID: ORCID
Xiang Gao
1
Lei Yang
1
ORCID: ORCID
Wei He
1
Jijun Lu
1
ORCID: ORCID

  1. School of Mechanical Engineering and Automation, Wuhan Textile University, China
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Abstract

This paper presents the study about defects found in industrial high silicon ductile iron. The microstructures were analysed using an optical microscope. Afterwards, a scanning electron microscope was used to analyse the chemical composition.The study also examined the origin of oxygen and what is the amount of oxygen in the cast iron.The amount of active oxygen was measured at two production processes. Firstly, at the end of melting process, and secondly, after the nodularization treatment. The research was carried out with different proportions of the raw materials. The focus was on determining the mechanism of the formation of slag defects to eliminate them in order to obtain ductile iron with increased silicon content of the highest possible quality. The research presented in this publication is a part of an implementation doctorate carried out in the METALPOL Foundry in Węgierska Górka (Poland). The presented research concerns the elaboration of initial parameters of liquid metal intended for processing into high-silicon ductile cast iron SiMo1000 type with aluminum and chromium additives.
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Bibliography

[1] Kopyciński, D. (2015). Shaping the structure and mechanical properties of cast iron intended for operation in difficult conditions of use (selected issues). Katowice-Gliwice: Monography. Archives of Foundry Engineering. (in Polish).
[2] Kleiner, S. & Track K. (2010). SiMo 1000 - Ein aluminium - legiertes gusseisen für Hochtemperatur-anwendungen. Giesserei. 97, 28-34.
[3] Papis, K., Tunziniand, S., Menk, W. (2014). Cast iron alloys for exhaust applications. In 10th International Symposium on the Science and Processing of Cast Iron - SPCI10, November 2014. Mar del Plata, Argentina.
[4] Öberg, Ch., Zhu, B. & Jonsson, S. (2017). Plastic deformation and creep of two ductile cast irons, SiMo51 and SiMo1000, during thermal cycling with large strain. Materials Science Forum. 925, 361-368. DOI: https://doi.org/10.4028/www.scientific.net/MSF.925.361.
[5] Guzik, E. (2001). Cast iron refining processes, selected issues. Katowice: Archiwum Odlewnictwa PAN. (in Polish).
[6] Collective work (2013). Foundry's guide. Kraków: STOP. 138-139. (in Polish).
[7] Keivan A. Kasvayee, & Ghasemali E. (2017). Characterization and modeling of the mechanical behavior of high silicon ductile iron. Material Science & Engineering A. 708, 159-170. DOI: https://doi.org/10.1016/j.msea.2017.09.115.
[8] Li, D., Perrin,. R., Burger, G., McFarlan, D., Black, B., Logan, R. & Williams, R. (2004). Solidification behavior, microstructure, mechanical properties, hot oxidation and thermal fatigue resistance of high silicon SiMo nodular cast irons. SAE International, Warrendale, 1-12. DOI: https://doi.org/10.4271/2004-01-0792.
[9] Muller, J., Wolf, G. (2001). Optimierte magnesiumdrahtinjektionstechnik zur herstellung von hochwertigem gusseisen mit kugelgraphit aus kupolofenbasiseisn. Giessereiforschung. 53(3), 85-103.
[10] Hampl, J. & Elbert, T. (2010). On modelling of the effect of oxygen on graphite morphology and properties of modified cast irons. Archives of Foundry Engineering. 10(4), 55-60.
[11] Mocek, J., Chojecki, A. (2009). Changes in the gas atmosphere of the casting mould during pouring iron alloys. In XXXIII Scientific Founder's Day Conference. Kraków. (in Polish).
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Authors and Affiliations

Ł. Dyrlaga
1 2
D. Kopyciński
1
E. Guzik
1

  1. AGH University of Science and Technology, Department of Foundry Engineering, Al. Mickiewicza 30, 30-059 Kraków, Poland
  2. METALPOL Węgierska Górka ul. Kolejowa 6, 34-350 Węgierska Górka, Poland

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