Publication detail

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

NEVŘIVOVÁ, L. ZEMÁNEK, D.

Original Title

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

Type

journal article in Web of Science

Language

English

Original Abstract

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.

Keywords

sol-gel method; refractory; castable; binder; mullite; mineralogical composition

Authors

NEVŘIVOVÁ, L.; ZEMÁNEK, D.

Released

1. 9. 2023

Publisher

MDPI

Location

BASEL

ISBN

1996-1944

Periodical

Materials

Year of study

16

Number

15

State

Swiss Confederation

Pages from

100

Pages to

114

Pages count

14

URL

https://www.mdpi.com/1996-1944/16/15/5466

Full text in the Digital Library

http://hdl.handle.net/11012/214450

BibTex

@article{BUT184755,
  author="Lenka {Nevřivová} and David {Zemánek}",
  title="Study of the Mineralogical Composition of an Alumina-Silica Binder System Formed by the Sol-Gel Method",
  journal="Materials",
  year="2023",
  volume="16",
  number="15",
  pages="100--114",
  doi="10.3390/ma16155466",
  issn="1996-1944",
  url="https://www.mdpi.com/1996-1944/16/15/5466"
}