Cargando…

The Influence of Alumina Bubbles on the Properties of Lightweight Corundum–Spinel Refractory

The use of a lightweight corundum–spinel refractory in working lining could reduce the thermal conductivity of industrial furnaces. In this study, bubble alumina was introduced to realize a lightweight Al(2)O(3)-MgAl(2)O(4) refractory assisted by the reactive sintering of Al(2)O(3) and MgO. The effe...

Descripción completa

Detalles Bibliográficos
Autores principales: Xin, Yalou, Jian, Yunling, Yin, Hongfeng, Tang, Yun, Yuan, Hudie, Liu, Yuchi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10488691/
https://www.ncbi.nlm.nih.gov/pubmed/37687601
http://dx.doi.org/10.3390/ma16175908
_version_ 1785103536227352576
author Xin, Yalou
Jian, Yunling
Yin, Hongfeng
Tang, Yun
Yuan, Hudie
Liu, Yuchi
author_facet Xin, Yalou
Jian, Yunling
Yin, Hongfeng
Tang, Yun
Yuan, Hudie
Liu, Yuchi
author_sort Xin, Yalou
collection PubMed
description The use of a lightweight corundum–spinel refractory in working lining could reduce the thermal conductivity of industrial furnaces. In this study, bubble alumina was introduced to realize a lightweight Al(2)O(3)-MgAl(2)O(4) refractory assisted by the reactive sintering of Al(2)O(3) and MgO. The effects of alumina bubble content and sintering temperature on the phase compositions, microstructure and properties of the lightweight refractory were investigated. The results indicated that the overall performance of the lightweight Al(2)O(3)-MgAl(2)O(4) refractory was mainly dominated by the content of alumina bubbles. The bulk density, compressive strength and thermal conductivity all decreased when the alumina bubble content increased from 10 to 30 wt%. Meanwhile, the sintering temperature also significantly affected the properties of the obtained refractory. It is worth noting that specimens fired at 1650 °C achieved a high refractoriness under load (RUL) of more than 1700 °C when alumina bubble content was less than 30 wt%, which was comparable to that of the dense Al(2)O(3)-MgAl(2)O(4) refractory. The thermal conductivity of the obtained samples was remarkably decreased to no more than 2.13 W/(m·K). In order to overcome the trade-off between the light weight of the refractory and overall performance, it is feasible to adjust the content of alumina bubbles and raise the sintering temperature appropriately.
format Online
Article
Text
id pubmed-10488691
institution National Center for Biotechnology Information
language English
publishDate 2023
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-104886912023-09-09 The Influence of Alumina Bubbles on the Properties of Lightweight Corundum–Spinel Refractory Xin, Yalou Jian, Yunling Yin, Hongfeng Tang, Yun Yuan, Hudie Liu, Yuchi Materials (Basel) Article The use of a lightweight corundum–spinel refractory in working lining could reduce the thermal conductivity of industrial furnaces. In this study, bubble alumina was introduced to realize a lightweight Al(2)O(3)-MgAl(2)O(4) refractory assisted by the reactive sintering of Al(2)O(3) and MgO. The effects of alumina bubble content and sintering temperature on the phase compositions, microstructure and properties of the lightweight refractory were investigated. The results indicated that the overall performance of the lightweight Al(2)O(3)-MgAl(2)O(4) refractory was mainly dominated by the content of alumina bubbles. The bulk density, compressive strength and thermal conductivity all decreased when the alumina bubble content increased from 10 to 30 wt%. Meanwhile, the sintering temperature also significantly affected the properties of the obtained refractory. It is worth noting that specimens fired at 1650 °C achieved a high refractoriness under load (RUL) of more than 1700 °C when alumina bubble content was less than 30 wt%, which was comparable to that of the dense Al(2)O(3)-MgAl(2)O(4) refractory. The thermal conductivity of the obtained samples was remarkably decreased to no more than 2.13 W/(m·K). In order to overcome the trade-off between the light weight of the refractory and overall performance, it is feasible to adjust the content of alumina bubbles and raise the sintering temperature appropriately. MDPI 2023-08-29 /pmc/articles/PMC10488691/ /pubmed/37687601 http://dx.doi.org/10.3390/ma16175908 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Xin, Yalou
Jian, Yunling
Yin, Hongfeng
Tang, Yun
Yuan, Hudie
Liu, Yuchi
The Influence of Alumina Bubbles on the Properties of Lightweight Corundum–Spinel Refractory
title The Influence of Alumina Bubbles on the Properties of Lightweight Corundum–Spinel Refractory
title_full The Influence of Alumina Bubbles on the Properties of Lightweight Corundum–Spinel Refractory
title_fullStr The Influence of Alumina Bubbles on the Properties of Lightweight Corundum–Spinel Refractory
title_full_unstemmed The Influence of Alumina Bubbles on the Properties of Lightweight Corundum–Spinel Refractory
title_short The Influence of Alumina Bubbles on the Properties of Lightweight Corundum–Spinel Refractory
title_sort influence of alumina bubbles on the properties of lightweight corundum–spinel refractory
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10488691/
https://www.ncbi.nlm.nih.gov/pubmed/37687601
http://dx.doi.org/10.3390/ma16175908
work_keys_str_mv AT xinyalou theinfluenceofaluminabubblesonthepropertiesoflightweightcorundumspinelrefractory
AT jianyunling theinfluenceofaluminabubblesonthepropertiesoflightweightcorundumspinelrefractory
AT yinhongfeng theinfluenceofaluminabubblesonthepropertiesoflightweightcorundumspinelrefractory
AT tangyun theinfluenceofaluminabubblesonthepropertiesoflightweightcorundumspinelrefractory
AT yuanhudie theinfluenceofaluminabubblesonthepropertiesoflightweightcorundumspinelrefractory
AT liuyuchi theinfluenceofaluminabubblesonthepropertiesoflightweightcorundumspinelrefractory
AT xinyalou influenceofaluminabubblesonthepropertiesoflightweightcorundumspinelrefractory
AT jianyunling influenceofaluminabubblesonthepropertiesoflightweightcorundumspinelrefractory
AT yinhongfeng influenceofaluminabubblesonthepropertiesoflightweightcorundumspinelrefractory
AT tangyun influenceofaluminabubblesonthepropertiesoflightweightcorundumspinelrefractory
AT yuanhudie influenceofaluminabubblesonthepropertiesoflightweightcorundumspinelrefractory
AT liuyuchi influenceofaluminabubblesonthepropertiesoflightweightcorundumspinelrefractory