Study of the Mineralogical Composition of an Alumina-Silica Binder System Formed by the Sol-Gel Method

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F23%3APU149082" target="_blank" >RIV/00216305:26110/23:PU149082 - isvavai.cz</a>

Result on the web

<a href="https://www.mdpi.com/1996-1944/16/15/5466" target="_blank" >https://www.mdpi.com/1996-1944/16/15/5466</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/ma16155466" target="_blank" >10.3390/ma16155466</a>

Result language

angličtina

Original language name

Study of the Mineralogical Composition of an Alumina-Silica Binder System Formed by the Sol-Gel Method

Original language description

Colloidal bonds are realized by sol-gel technology. The binder system of the refractory castable belongs to the Al2O3-SiO2 binary diagram. Mullite is the most thermally stable mineral in this system. This work was motivated by an attempt to maximize the mullite content in the NCC binder system, because a high content of mullite is a guarantee of the long service life of refractories. Initially, the mineralogical composition of the pure gel was tested after drying and firing at temperatures between 1000 & DEG;C and 1600 & DEG;C. The behavior of the gel during drying was described. Subsequently, a method of minimizing gel shrinkage during drying was sought. To this aim, fine fillers (microfillers) of alumina and silica were tested. In particular, the reactivity of the microfillers, the ability of the microfillers to react with the sol to form mullite, and the drying shrinkage of the microfiller-doped gel were evaluated. The study showed that the least suitable source of Al2O3 in terms of its reactivity is tabular corundum, which produces the lowest amount of mullite. The internal structure of the prepared binder system when using different microfillers was described. Based on the results from the second stage of the work, several complete matrixes of the binder system were designed and the degree of their mullitization at different firing temperatures was studied. During this stage, it was shown that the degree of mullitization of the binder system depends mainly on the microsilica content. In the binder system, the maximum mullite content recorded was 76%. The effect of amorphous SiO2 on the bulk density and internal structure of the binder system was also described.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10400 - Chemical sciences

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Materials

ISSN

1996-1944

e-ISSN

—

Volume of the periodical

16

Issue of the periodical within the volume

15

Country of publishing house

CH - SWITZERLAND

Number of pages

14

Pages from-to

100-114

UT code for WoS article

001045593500001

EID of the result in the Scopus database

2-s2.0-85167801097