Nanocomposites Based on Water Glass Matrix as a Foundry Binder: Chosen Physicochemical Properties

• Autorzy: Kmita A. , Roczniak A.

Identyfikatory

DOI

10.1515/afe-2017-0017

• Języki publikacji: EN

Abstrakty

EN

The nanocomposites based on water glass matrix were attempted in the study. Nanoparticles of ZnO, Al2O3 or MgO in organic solutions were applied into water glass matrix in the amounts of: 1.5; 3; 4 or 5 mas. %. Wettability of the quartz sad by the nanocomposites based on water glass matrix was determined by testing changes of the wetting angle θ in time τ for the system: quartz – binder in non-stationary state, by means of the device for measuring wetting angles. Wettability measurements were carried out under isothermal conditions at an ambient temperature (20 – 25 ^oC). The modification improves wettability of quartz matrix by water glass, which is effective in improving strength properties of hardened moulding sands. Out of the considered modifiers in colloidal solution of propyl alcohol water glass modified by MgO nanoparticles indicated the smallest values of the equilibrium wetting angle θr. This value was equal app. 11 degrees and was smaller no less than 40 degrees than θr value determined for not modified water glass. Viscosity η of nanocomposites based on water glass matrix was determined from the flow curve, it means from the empirically determined dependence of the shearing stress τ on shear rate γ: τ = f (γ) (1), by means of the rotational rheometer. Measurements were carried out at a constant temperature of 20 ^oC. The modification influences the binder viscosity. This influence is conditioned by: amount of the introduced modifier as well as dimensions and kinds of nanoparticles and organic solvents. The viscosity increase of the modified binder does not negatively influence its functional properties.

Słowa kluczowe

EN

innovative technologies; water glass; nanoparticles; wettability; viscosity

PL

technologie innowacyjne; szkło wodne; nanocząsteczki; lepkość

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2017
• Tom: Vol. 17, iss. 1
• Strony: 93--98
• Opis fizyczny: Bibliogr. 10 poz., il., tab., wykr.

Twórcy

autor

Kmita A.

• AGH University of Science and Technology, Academic Centre for Materials and Nanotechnology

autor

Roczniak A.

• AGH University of Science and Technology, Faculty of Foundry Engineering Reymonta 23, 30-059 Cracow, Poland

Bibliografia

• [1] Bhattacharya, S., Datta A., Berg, J.M. & Gangopadhyay S. (2004). Studies on surface wettability of poly(dimethyl) siloxane (PDMS) and glass under oxygen-plasma treatment and correlation with bond strength. Journal of Microelectromechanical Systems. 14, 590-597.
• [2] Hutera, B. (2008). The effect of solvent content in binder on the nature of surface phenomena taking place in a sand grains–binding material system. Scientific Publishers AKAPIT, ISBN 978-83-60958-B.
• [3] Hutera, B., Smyksy, K. & Drożyński, D. (2007). Evaluation of wettability of binders used in moulding sands. Archives of Foundry Engineering. 7(1), 103-106.
• [4] Żenkiewicz, M., Rytlewski, P., Czupryńska, J., Polański, J., Karasiewicz, T. & Engelgard, W. (2008). Contact angle and surface free energy of elektron-beam irradiated polymer composites. Polimery. 52, 446.
• [5] Izdebska-Szanda, I. & Baliński, A. (2011). New generation of ecological silicate binders. Procedia Engineering. 10, 887 -893.
• [6] Hutera, B. (2009). The boundary cases of sand-binder bond models. Archives of Mechanical Technology and Automation. 29(1), 21- 28.
• [7] Stypuła, B., Banaś, J., Habdank-Wojewódzki, T., Krawiec, H., Starowicz, M. (2004). Method for obtaining micro- and nano partictes of metal oxides. Patent No. P 369 320, 28. 07. 2004 r.
• [8] Wang, L. & Zhang, Y. (2013). Influence of additives on modification of sodium silicate and molding sand properties, Advanced Materials Research. 634- 638, 2702- 2706.
• [9] Kmita, A. (2014). Modification of water glass, the moulding sands binder, by nanoparticles of metal oxides in organic solvents. PhD Thesis. Krakow. AGH.
• [10] Lewandowski, J.L. (1997). Materials for molds. Scientific Publishers AKAPIT. Krakow. ISBN 83-7108-21-2. (in Polish).

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).