Detail publikace

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

NEVŘIVOVÁ, L. ZEMÁNEK, D.

Originální název

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

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

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.

Klíčová slova

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

Autoři

NEVŘIVOVÁ, L.; ZEMÁNEK, D.

Vydáno

1. 9. 2023

Nakladatel

MDPI

Místo

BASEL

ISSN

1996-1944

Periodikum

Materials

Ročník

16

Číslo

15

Stát

Švýcarská konfederace

Strany od

100

Strany do

114

Strany počet

14

URL

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

Plný text v Digitální knihovně

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"
}