Thermostability of montmorillonitic clays
Bentonite is one of the most widespread used clays connected with various applications. In the case of foundry technology, bentonite is primarily used as a binder for mold manufacture. Thermal stability of bentonites is a natural property of clay minerals and it depends on the genesis, source and ch...
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doaj-b3e0f591b1e44fc5bc2e100b30c664fb2020-11-24T23:24:06ZengFoundry Journal AgencyChina Foundry1672-64211672-64212014-05-01113201207Thermostability of montmorillonitic claysPetr Jelínek0Stanisław M. Dobosz1Jaroslav Beňo2VSB – Technical University of Ostrava, Faculty of Metallurgy and Material Engineering, Department of Metallurgy and Foundry Engineering, Czech RepublicAGH University of Science and Technology, Faculty of Foundry Engineering, Department of Moulding Materials, Mould Technology and Foundry of Non-ferrous Metals, Al. Mickiewicza 30, 30-059 Krakow, PolandVSB – Technical University of Ostrava, Faculty of Metallurgy and Material Engineering, Department of Metallurgy and Foundry Engineering, Czech RepublicBentonite is one of the most widespread used clays connected with various applications. In the case of foundry technology, bentonite is primarily used as a binder for mold manufacture. Thermal stability of bentonites is a natural property of clay minerals and it depends on the genesis, source and chemical composition of the clay. This property is also closely connected to bentonite structure. According to DTA analysis if only one peak of dehydroxylation is observed (about 600 ºC), the cis- isomerism of bentonite is expected, while two peaks of de-hydroxylation (about 550 and 850 ºC) are expected in the trans- one. In this overview, the bentonite structure, the water – bentonite interaction and the swelling behavior of bentonite in connection with the general technological properties of bentonite molding mixture are summarized. Further, various types of methods for determination of bentonite thermostability are discussed, including instrumental analytical methods as well as methods that employ evaluation of various technological properties of bentonite binders and/or bentonite molding mixtures.http://www.foundryworld.com/uploadfile/2014061658091437.pdfbentonite; thermostability; binder; clay |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Petr Jelínek Stanisław M. Dobosz Jaroslav Beňo |
spellingShingle |
Petr Jelínek Stanisław M. Dobosz Jaroslav Beňo Thermostability of montmorillonitic clays China Foundry bentonite; thermostability; binder; clay |
author_facet |
Petr Jelínek Stanisław M. Dobosz Jaroslav Beňo |
author_sort |
Petr Jelínek |
title |
Thermostability of montmorillonitic clays |
title_short |
Thermostability of montmorillonitic clays |
title_full |
Thermostability of montmorillonitic clays |
title_fullStr |
Thermostability of montmorillonitic clays |
title_full_unstemmed |
Thermostability of montmorillonitic clays |
title_sort |
thermostability of montmorillonitic clays |
publisher |
Foundry Journal Agency |
series |
China Foundry |
issn |
1672-6421 1672-6421 |
publishDate |
2014-05-01 |
description |
Bentonite is one of the most widespread used clays connected with various applications. In the case of foundry technology, bentonite is primarily used as a binder for mold manufacture. Thermal stability of bentonites is a natural property of clay minerals and it depends on the genesis, source and chemical composition of the clay. This property is also closely connected to bentonite structure. According to DTA analysis if only one peak of dehydroxylation is observed (about 600 ºC), the cis- isomerism of bentonite is expected, while two peaks of de-hydroxylation (about 550 and 850 ºC) are expected in the trans- one. In this overview, the bentonite structure, the water – bentonite interaction and the swelling behavior of bentonite in connection with the general technological properties of bentonite molding mixture are summarized. Further, various types of methods for determination of bentonite thermostability are discussed, including instrumental analytical methods as well as methods that employ evaluation of various technological properties of bentonite binders and/or bentonite molding mixtures. |
topic |
bentonite; thermostability; binder; clay |
url |
http://www.foundryworld.com/uploadfile/2014061658091437.pdf |
work_keys_str_mv |
AT petrjelinek thermostabilityofmontmorilloniticclays AT stanisławmdobosz thermostabilityofmontmorilloniticclays AT jaroslavbeno thermostabilityofmontmorilloniticclays |
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