Formation and Influence of Magnesium-Alumina Spinel on the Properties of Refractory Forsterite-Spinel Ceramics

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F20%3APU134904" target="_blank" >RIV/00216305:26110/20:PU134904 - isvavai.cz</a>

Result on the web

<a href="http://mit.imt.si/izvodi/mit201/nguyen.pdf" target="_blank" >http://mit.imt.si/izvodi/mit201/nguyen.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.17222/mit.2019.198" target="_blank" >10.17222/mit.2019.198</a>

Result language

angličtina

Original language name

Formation and Influence of Magnesium-Alumina Spinel on the Properties of Refractory Forsterite-Spinel Ceramics

Original language description

Forsterite refractory ceramic is mostly used in the cement industry as the lining of a rotary kiln and as the lining of metallurgical furnaces due to its high refractoriness of up to 1850 °C. Another significant property of forsterite is its coefficient of linear thermal expansion used in the electrotechnical industry for ceramic-metal joints. An addition of aluminium oxide to a raw-material mixture results in the creation of a magnesium-alumina spinel (MgO·Al2O3), which improves the sintering and mechanical properties of forsterite ceramics. An inexpensive source of aluminium oxide is fly ash. The utilization of fly ash, a secondary energy product of coal-burning power plants, is important for the environment and sustainable development. This paper evaluates the transformation of mullite (3Al2O3·2SiO2) from fly ash into a magnesium-alumina spinel, its influence during the synthesis and the resulting properties of a fired forsterite refractory ceramic body. Forsterite-spinel ceramics were synthesized from olivine, calcined magnesite and 0–20 % of fly-ash powders. XRD analyses were used to determine the mineralogical composition, thermal analyses were used to determine the formation of spinel and its behaviour during the firing, and scanning electron microscopy (SEM) was used to determine the morphology of crystal phases. The refractoriness of pyrometric cones, refractoriness under load, thermal-shock resistance, water absorption, porosity and mechanical properties of the fired test samples were also determined. The transformation of mullite resulted in small amounts of magnesium-alumina spinel in the forsterite ceramics. Test results showed that the presence of magnesium-alumina spinel improved the sintering, microstructure, thermal-shock resistance and mechanical properties in comparison with pure-forsterite refractory ceramics.

Czech name

—

Czech description

—

Type

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

CEP classification

—

OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/GA18-02815S" target="_blank" >GA18-02815S: Elimination of sulphur oxide emission during the firing of ceramic bodies based on fly ashes of class C</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2020

Confidentiality

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

Name of the periodical

Materiali in tehnologije

ISSN

1580-2949

e-ISSN

1580-3414

Volume of the periodical

54

Issue of the periodical within the volume

1

Country of publishing house

SI - SLOVENIA

Number of pages

7

Pages from-to

135-141

UT code for WoS article

000536656900021

EID of the result in the Scopus database

2-s2.0-85081668100