Effect of microsilica addition on the properties of colloidal silica bonded bauxite-andalusite based castables

Colloidal silica bonded bauxite-andalusite based castables were prepared using homogenized bauxite and andalusite as aggregates, andalusite fines, corundum fines, ultrafine Al2O3 as matrixes and colloidal silica as binders. Effects of microsilica addition on the green strength, physical properties,...

Full description

Saved in:
Bibliographic Details
Published inCeramics international Vol. 44; no. 3; pp. 3064 - 3068
Main Authors Quanli, Jia, Ju, Zhang, Ying, Zhou, Gaoyang, Jia, Xinhong, Liu
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.02.2018
Subjects
Bauxite-andalusite castables
Colloidal silica
In-situ mullite
Microsilica
Colloidal silica
Bauxite-andalusite castables
Microsilica
In-situ mullite
Online AccessGet full text

Cover

More Information
Summary:Colloidal silica bonded bauxite-andalusite based castables were prepared using homogenized bauxite and andalusite as aggregates, andalusite fines, corundum fines, ultrafine Al2O3 as matrixes and colloidal silica as binders. Effects of microsilica addition on the green strength, physical properties, hot strength and thermal shock resistance of castables were investigated. Moreover, phase composition and morphological evolution of specimens were characterized by XRD and SEM analysis. Green strength after demoulding, cold strength and hot strength as well as thermal shock resistance of the castables are enhanced with microsilica addition, which attribute to generating more chemical bond (–Si–O–Si–) after demoulding and heating at intermediate temperature (up to 1100°C), and creating a stronger mullite bonding at higher temperature (1400°C) compare to the specimens without microsilica.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2017.11.067