Properties of Bentonites and Bentonite Mixtures used in Casting Processes

• Autorzy: Paź S. , Drożyński D. , Górny M. , Cukrowicz S.

Identyfikatory

DOI

10.24425/afe.2019.127113

• Języki publikacji: EN

Abstrakty

EN

In this work, an assessment and comparison of the quality of selected bentonites and bentonite mixtures was made. The samples consisted of available foundry materials used for bonding green sands. Determining the homogeneity degree and specific surface area of the grains allowed us to compare the examined materials and determine their influence on other parameters. On the basis of a thermal analysis of the bentonites or bentonite mixtures, the changes occurring in the sample during its heating were determined. Determining the potential for ion exchange and montmorillonite content enabled us to assess the binding properties of the materials. The preparation of six green sands with different bentonites or bentonite mixtures gave us the opportunity to assess the changes in apparent density, permeability, compressive strength and friability as a function of humidity, and the impact of different materials on the mentioned parameters. Their charts were analyzed, and the molding sand with the addition of bentonite or a bentonite mixture was selected for which these parameters are favorable. On this basis, the best-presented binding material was assessed and selected.

Słowa kluczowe

EN

casting processes; bentonite; properties of bentonites; bentonite mixture; green sands

PL

procesy odlewnicze; bentonit; właściwości bentonitów; mieszanki bentonitowe

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2019
• Tom: iss. 2
• Strony: 35--40
• Opis fizyczny: Bibliogr. 11 poz., tab., wykr.

Twórcy

autor

Paź S.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Krakow, Poland

autor

Drożyński D.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Krakow, Poland

autor

Górny M.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Krakow, Poland

autor

Cukrowicz S.

• AGH University of Science and Technology, Faculty of Foundry Engineering, Krakow, Poland

Bibliografia

• [1] Lewandowski, J.L. (1997). Materials for molds. Kraków: “Akapit”. p 70-71, 209, 223. (in Polish).
• [2] American Foundry Society Technical Department. (2016). Bentonite Clay`s Role in Green Sand System. Modern Casting. 106(6), p 42.
• [3] Beňo, J., Lichý, P., Kroupová, I. & Radkovský, F. (2016). Influencing of foundry bentonite mixtures by binder activation. Metalurgija. 55(1), 7.
• [4] Holtzer, M., Kwaśniewska-Królikowska, D., Bobrowski, A., Dańko, R., Grabowska, B., Żymankowska-Kumon, S. & Solarski, W. (2012). Investigations of a harmful components emission from moulding sands with bentonite and lustrous carbon carriers when in contact with liquid metals. Foundry Review. 3-4, 125. (in Polish).
• [5] Żymankowska-Kumon, S., Holtzer, M. & Grabowski, G. (2011). Thermal analysis of foundry bentonites. Archives of Foundry Engineering. 11(4), 209.
• [6] Vingas, G.J. & Zrimsek, A.H. (1964). Thermal Stability of bentonites in foundry molding sand. Clays and Clay Minerals. 13(1), 367.
• [7] Kurleto, Ż., Grabowska, B., Kaczmarska, K. & Szymański, Ł. (2015). Chemical bonds in the montmorillonite. Archives of Foundry Engineering. 15(4), 81. (in Polish).
• [8] Cobett, T., T. Cobett & Associates. (2002). The ABCs of Green Sand. Foundry Management & Technology. 130(4), 24-39.
• [9] Chang, Y. & Hocheng, H. (2001). The flowability of bentonite bonded green molding sand. Journal of Materials Processing Technology, 113(1), 238-244.
• [10] Grefhorst C. (2006). Modern bentonite bonded molds, Archives of Foundry, 6(20), 51-53.
• [11] Żymankowska-Kumon, S. (2012). Changes occurring in casting bentonites under the influence of temperature. Unpublished doctoral dissertation, Kraków. p 11-12. (in Polish).

Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).