Andalusite transformation and properties of andalusite-bearing refractories fired in different atmospheres

We found in our research that andalusite aggregate fired in a reducing atmosphere exhibits a lower mullitization rate than that fired in an air atmosphere. For investigating the effect of atmosphere on the transformation of andalusite and the properties of andalusite-containing refractories, andalus...

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Bibliographic Details
Published in:Ceramics international 2019-02, Vol.45 (3), p.3186-3191
Main Authors: Ding, Dafei, Ye, Guotian, Li, Na, Liao, Guihua, Tian, Xuekun, Chen, Liugang
Format: Article
Language:English
Subjects:
Andalusite
Firing atmosphere
Mechanical properties
Microstructure
Mullitization
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Summary:We found in our research that andalusite aggregate fired in a reducing atmosphere exhibits a lower mullitization rate than that fired in an air atmosphere. For investigating the effect of atmosphere on the transformation of andalusite and the properties of andalusite-containing refractories, andalusite powder (≤0.074 mm) and refractories containing andalusite aggregate (3–1 mm) were fired in air and carbon embedding, respectively. The phases and microstructure of the andalusite fired in both atmospheres were characterized by X-ray diffraction and scanning electron microscopy, respectively. The correlations of the properties of the andalusite-bearing refractories with the firing atmospheres were investigated in terms of volume stability, mechanical strength, and thermal shock resistance. The difference in the properties of the refractories was discussed with respect to the varied transformation rates of andalusite, and in terms of the different viscosities of the silica-rich glass caused by the different atmospheres.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2018.10.220