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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

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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

Footnotes

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

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