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Thermal Stability of Bentonites in Foundry Molding Sand

Published online by Cambridge University Press:  01 January 2024

George J. Vingas  and
Arthur H. Zrimsek
George J. Vingas
Affiliation:
Magnet Cove Barium Corporation, Arlington Heights, Illinois, USA, P.O. Box 355
Arthur H. Zrimsek
Affiliation:
Magnet Cove Barium Corporation, Arlington Heights, Illinois, USA, P.O. Box 355
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Abstract

The effects of heat on the behavior of sodium and calcium bentonite in bonding foundry sands were studied.

Tests such as differential thermal analysis, viscosity, and melting or vitrification temperatures do not indicate the suitability of a bentonite for foundry use.

The deterioration temperatures of sodium and calcium bentonite are 1180° and 600°F respectively.

Reactivities of bentonites with cereal as affected by temperature and mulling were also studied. Flowability of sands, defined as mold densification in this paper, is better with heated calcium than sodium bentonite.

Heating bentonites alone does not simulate the conditions encountered in heating bentonite-sand mixtures in a mold.

Type
General Session
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 13 , February 1964 , pp. 367 - 380
Copyright
Copyright © Clay Minerals Society 1964

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Footnotes

The writers thank Magnet Barium Corporation for permission to conduct these experiments and publish the results.

References

Bishop, H. F., and Pellini, W. S. (1951) Solidification of steel from and and chill walls, U.S. Naval Res. Lab. NRL Rep. 3785.Google Scholar
Foundry Sand Handbook, 7th ed. (1963) American Foundrymen's Society, Des Plaines, Illinois.Google Scholar
Grim, R. E., and Cuthbert, F. L. (1945) The bonding action of clays, Part I, Clays in green molding sands, Illinois State Geol. Survey Rep. Invest. 102.Google Scholar
Heine, R. W., Parker, J. J., King, E. H., Schumacher, J. S., and Bosworth, T. J. (1959) Sand movement and compaction in green sand molding, Trans. Am. Foundry- men's Soc. 67, 47.Google Scholar
Hofmann, F. (1958) Investigations on the effect of heat on the bonding properties of various bentonites, Trans. Am. Foundrymen's Soc. 66, 305.Google Scholar
Marek, S. T. (1963) Transformation zones in green sand, Mod. Castings 43, 185.Google Scholar
Ojala, T. (1962) The equilibrium of foundry system sands, Part I, Cast Iron Melts and Methods, 5, 2.Google Scholar
Paschkis, V. (1945) Studies on solidification of castings, Trans. Am. Foundrymen's Soc. 53, 90.Google Scholar
Ruddle, R. W. (1957) The Solidification of Castings, Institute of Metals, London.Google Scholar
Vingas, G. J., and Zrimsek, A. E. (1961) Systematic approach to sand design and control, Progress Report 3, The Mulling Effect, Trans. Am. Foundrymen's Soc. 69, 101.Google Scholar
Vingas, G. J., and Zrimsek, A. H. (1962) Systematic approach to sand design and control, Progress Report 6, Trans. Am. Foundrymen's Soc. 70, 321.Google Scholar
Vingas, G. J., and Zrimsek, A. H. (1963) Steel foundry green facing sands, Mod. Castings 43, 50.Google Scholar
Zrimsek, A. H., and Vingas, G. J. (1960) Systematic approach to sand design and control, Trans. Am. Foundrymen's Soc. 68, 449.Google Scholar
Zrimsek, A. H., and Vingas, G. J. (1961a) Systematic approach to sand design and control, Progress Report 2, Clay bonded sand dry properties, Trans. Am. Foundry- men's Soc. 69, 33.Google Scholar
Zrimsek, A. H., and Vingas, G. J. (1961b) Systematic approach to sand design and control, Progress Report 4, Wood flour: Trans. Am. Foundrymen's Soc. 69, 141.Google Scholar
Zrimsek, A. H., and Vingas, G. J. (1961c) Systematic approach to sand design and control, Progress Report 5, Interpretation of data, Trans. Am. Foundrymen's Soc. 69, 229.Google Scholar
Zrimsek, A. H., and Vingas, G. J. (1963) Mechanics of rework sand, Mod. Castings 43, 36.Google Scholar
Zrimsek, A. H., and Vingas, G. J. (1964) Factors controlling casting dimension, Trans. Am. Foundrymen's Soc. 72, To be published.Google Scholar